Ultimate Ford F-150 Brake Bleeding Guide (All Years)

Bleeding the brakes on your Ford F-150 is the essential process of removing air from the hydraulic system. Air bubbles compromise braking power and create a dangerous, spongy pedal feel. This complete guide provides expert tips and proven methods for all model years.

Properly bled brakes restore firm pedal response and ensure your truck stops safely and reliably. Whether tackling routine maintenance or post-repair work, this task is a critical DIY skill for any F-150 owner. Avoiding common mistakes saves time and prevents costly do-overs.

Why Your Ford F-150 Brakes Feel Spongy After Bleeding

If your Ford F-150 still has a soft or spongy brake pedal after a brake job, trapped air in the brake lines is the most common cause. Air compresses much more easily than brake fluid, which means when you press the brake pedal, some of the pressure is absorbed by air bubbles instead of transferring directly to the brake calipers.

This problem often happens during brake pad, rotor, or caliper replacement when the brake hydraulic system is opened. Even a small amount of air can reduce braking efficiency and increase stopping distance.

The solution is proper brake bleeding to remove every air bubble from the system. Using the right tools makes this process much faster and far more reliable. If you’re looking for the most effective tools for the job, check out this guide to the Best one-man brake bleeder kits for DIY mechanics.

Quick Fix: Use a Vacuum Brake Bleeder Kit

A vacuum brake bleeder kit allows you to pull brake fluid through the lines while extracting trapped air. This makes it possible to bleed your Ford F-150’s brakes alone without repeatedly pumping the pedal.

Recommended Tool: Mityvac MV8000 Automotive Brake Bleeder Kit

This popular vacuum bleeder is widely used by DIY mechanics because it simplifies the bleeding process and minimizes mess.

Why it works well for F-150 brake bleeding:

• Hand-held vacuum pump removes air efficiently
• Includes multiple adapters for different bleeder valves
• Durable fluid reservoir prevents spills
• Works for brake bleeding and vacuum diagnostics

Check out our detailed review here →https://automedian.com/mityvac-mv8000-automotive-brake-bleeder-kit-review/

If you want to compare similar tools before choosing one, this roundup of the best brake bleeder kits for cars and trucks highlights several reliable options.

When Bleeding Alone Isn’t Enough

Sometimes the issue isn’t just trapped air. If your F-150 still has poor brake feel after proper bleeding, you may be dealing with:

• A failing master cylinder
• Leaking brake lines or fittings
• Contaminated brake fluid
• Improper bleeding sequence

In those cases, using a more advanced kit or different bleeding method may help. These guides can help you troubleshoot further:

• Orion Motor Tech Brake Bleeder Kit Review – a versatile DIY bleeding tool
• Best hand vacuum brake bleeder kits – top-rated manual vacuum systems

With the right bleeding method and equipment, most Ford F-150 brake pedal problems can be resolved quickly in your own garage.

How to Bleed Brakes on a Ford F-150: Step-by-Step Process

Successfully bleeding your F-150’s brakes requires a methodical approach. This process removes air from the hydraulic lines, restoring firm pedal feel. Following the correct sequence is critical for safety and performance.

Essential Tools and Materials You’ll Need

Gathering the right equipment before you start prevents mid-job interruptions. Having everything on hand ensures a smooth and efficient bleeding process. Proper preparation is the key to a professional result.

• Brake Fluid: Use only DOT 3 or DOT 4 fluid as specified in your owner’s manual. Have at least two new, unopened quarts ready.
• Basic Tools: A combination wrench that perfectly fits your bleeder screws (often 8mm or 10mm), a clear vinyl hose, and a clean catch bottle.
• Safety Gear: Nitrile gloves and safety glasses are mandatory. Brake fluid is corrosive and damages paint and eyes.
• Helper or Bleeder Tool: A second person to pump the brake pedal or a dedicated brake bleeding kit.

Proper Brake Bleeding Sequence for Your Truck

The correct order is determined by your F-150’s brake line routing. This sequence ensures you push air bubbles toward the farthest point from the master cylinder. Always start with the wheel farthest from the master cylinder.

For most Ford F-150 models, follow this exact order:

1. Right Rear passenger-side wheel
2. Left Rear driver-side wheel
3. Right Front passenger-side wheel
4. Left Front driver-side wheel

Key Takeaway: The golden rule is farthest to closest. Never skip a wheel or change the sequence, as this can trap air in the system’s longest lines. Always double-check your master cylinder fluid level between each wheel to avoid introducing new air.

Executing the Two-Person Bleeding Method

This traditional technique is highly effective with good communication. One person operates the brake pedal inside the cab while the other works at the wheel. Clear commands prevent mistakes.

Attach the clear hose to the bleeder screw and submerge the other end in a bottle with fresh brake fluid. Your helper should then pump the pedal 3-5 times and hold firm pressure. With pressure held, open the bleeder screw about a quarter-turn.

Watch as fluid and air bubbles stream into the hose. Close the screw before the pedal reaches the floor. Signal your helper to repeat the “pump, hold, open, close” cycle until the fluid runs completely clear and bubble-free.

Advanced Brake Bleeding Techniques and Troubleshooting

Mastering advanced methods solves common problems and ensures a perfect bleed. These techniques address stubborn air pockets and specific F-150 system quirks. Understanding troubleshooting saves time and frustration.

Using a One-Person Brake Bleeding Kit

Vacuum or pressure bleeders allow efficient solo work. These tools eliminate the need for a helper and provide consistent results. They are excellent for complete system flushes or routine maintenance.

• Pressure Bleeder (like Motive 0100): Attaches to the master cylinder to push fluid through the system. It maintains constant pressure for a thorough, bubble-free flush.
• Vacuum Pump (like Mityvac): Pulls fluid and air from each bleeder screw. This method is great for spot-bleeding a single caliper or checking your work.
• Key Benefit: Both methods let you see air bubbles exiting clearly. You can work methodically without coordinating with another person.

Solving Common Ford F-150 Brake Bleeding Problems

Even with the correct procedure, issues can arise. Diagnosing these problems quickly gets your brakes back to optimal performance. Here are solutions to frequent challenges.

Problem	Likely Cause	Solution
Spongy pedal after bleeding	Air still trapped in system; often in the ABS module.	Perform an ABS module activation cycle using a scan tool, then re-bleed.
Fluid stream is weak or intermittent	Clogged bleeder screw or master cylinder issue.	Clean the bleeder screw orifice. Check master cylinder for internal failure.
Pedal goes to the floor	Major air intrusion or master cylinder failure.	Check all fittings for leaks. Bench-bleed the master cylinder if recently replaced.

Critical Post-Bleeding Checks and Safety Test

Your job isn’t complete until you verify the system’s safety. Never skip these final validation steps before driving. They confirm a successful repair and ensure your truck stops reliably.

1. Inspect Fluid Level: Top off the master cylinder to the “MAX” line with fresh, sealed fluid.
2. Test Pedal Feel: With the engine off, pump the pedal. It should feel firm and high, not spongy or sinking.
3. Conduct a Low-Speed Test: In a safe, empty area, drive under 10 MPH and apply brakes gently. Listen for noises and feel for grabbing or pulling.

Pro Tip: If your F-150 has a hydroboost brake system (common on diesel and heavy-duty models), the bleeding procedure is similar but requires the engine to be running to power the booster. Always consult your specific year’s service manual for variations.

Ford F-150 Brake Fluid Guide and Maintenance Schedule

Using the correct fluid and maintaining it is as crucial as the bleeding process itself. Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This contamination lowers its boiling point and causes internal corrosion.

Choosing the Right Brake Fluid for Your Model Year

Always consult your owner’s manual for the manufacturer’s exact specification. Using the wrong type can damage seals and components. The cap on the master cylinder reservoir also typically states the required fluid.

• DOT 3: The most common specification for older F-150 models. It has a minimum dry boiling point of 401°F (205°C).
• DOT 4: Common in newer trucks; offers a higher boiling point (446°F/230°C dry). It is compatible with DOT 3 systems but absorbs moisture faster.
• DOT 4 LV (Low Viscosity): Used in some modern trucks with advanced ABS/ESC systems. Check your manual carefully before using.
• Critical Rule: Never use DOT 5 (silicone-based) in a system designed for DOT 3 or 4. They are not compatible and will cause system failure.

When to Bleed Your F-150 Brakes: Key Indicators

Don’t wait for a scheduled interval if you notice symptoms of air in the lines. A spongy brake pedal is the primary warning sign that demands immediate attention. Addressing it promptly restores safety.

Symptom	What It Means
Spongy or soft brake pedal	Air is compressing in the hydraulic lines instead of applying solid pressure to the pads.
Pedal travels closer to the floor	Excessive air or fluid loss has increased the amount of pedal stroke needed.
Inconsistent braking feel	Air pockets can cause a grabby or varying pedal response during application.
After replacing brake components	Any opened hydraulic line (caliper, hose, master cylinder) introduces air that must be purged.

Recommended Brake System Maintenance Intervals

Proactive maintenance prevents problems before they affect safety. While not all schedules list a strict “bleed by” date, fluid degradation follows a predictable timeline. Follow these guidelines for optimal performance.

1. Fluid Testing/Replacement: Test brake fluid moisture content annually. Most manufacturers recommend a complete flush every 2-3 years, regardless of mileage.
2. Visual Inspection: Check fluid color and level monthly. Fresh fluid is clear to amber; dark brown or black fluid is contaminated and needs replacement.
3. After Heavy Use: Consider bleeding brakes after severe towing, off-roading, or track use, as high heat accelerates fluid breakdown.

Warning: Brake fluid is a paint stripper. Always cover painted surfaces with a rag when working near the master cylinder. Clean any spills immediately with soap and water. Keep all fluid containers tightly sealed to prevent moisture absorption.

Expert Tips for Bleeding Ford F-150 ABS Systems

Modern F-150s with Anti-lock Braking Systems (ABS) require special consideration. Air can become trapped in the ABS modulator, which standard bleeding cannot remove. Understanding this process prevents a persistent spongy pedal.

When and How to Bleed the ABS Module

You must activate the ABS module’s internal valves to purge trapped air. This is necessary if air entered the system or after replacing the module. A standard bleed will not solve this specific issue.

• Primary Indicator: You’ve performed a thorough traditional bleed, but the pedal remains soft or spongy. This strongly suggests air is locked in the ABS unit.
• Required Tool: You need an OBD-II scan tool with ABS bi-directional control. Basic code readers cannot perform this function.
• The Process: The tool cycles the ABS pump and solenoids electronically, moving fluid (and air) through the modulator’s internal passages. You then re-bleed the entire system at the wheels.

Manual ABS Bleeding Method (Without a Scan Tool)

In some cases, you may be able to manually force air out of the ABS unit. This is a less precise workaround if a professional scan tool is unavailable. It relies on activating the ABS system through wheel slip.

1. Complete a standard brake bleeding procedure at all four wheels first.
2. Find a safe, low-traction surface like a gravel lot or empty, wet pavement.
3. Drive at 20-25 MPH and apply the brakes firmly enough to trigger the ABS. You will feel the pedal pulse.
4. Repeat this activation 2-3 times. Then, perform the standard four-wheel bleeding procedure once more.

Model-Specific Considerations by Generation

Bleeding procedures can vary between the 11th, 12th, 13th, and 14th generations of the F-150. Knowing your truck’s specifics avoids common pitfalls and ensures efficiency.

Generation (Years)	Key Bleeding Consideration
11th Gen (2004-2008)	Commonly uses a vacuum-assisted hydraulic booster. Standard bleeding sequence applies; watch for RABS (rear ABS) on some models.
12th Gen (2009-2014)	Widespread use of 4-wheel ABS and AdvanceTrac. A scan tool is highly recommended for a complete bleed on these systems.
13th Gen (2015-2020)	Uses sophisticated ABS/ESC modules. A capable scan tool is often necessary for a proper bleed after any component replacement.
14th Gen (2021-Present)	Electronics are even more integrated. Always consult the factory service information for the exact procedure and required tools.

Pro Advice: For trucks with integrated electronic parking brakes (2015+), you often must put the EPB into “service mode” via the dashboard menu or a scan tool before retracting the rear calipers. Failure to do this can damage the caliper motor.

Safety Precautions and Common Mistakes to Avoid

Brake work involves high-pressure fluid and your vehicle’s most critical safety system. Cutting corners here risks catastrophic failure. Following strict safety protocols protects you and ensures a reliable repair.

Critical Safety Warnings Before You Start

Your personal safety and the integrity of your truck depend on these non-negotiable rules. Ignoring them can lead to injury, vehicle damage, or an unsafe brake system. Review this list before touching any tool.

• Eye and Skin Protection: Always wear safety glasses and nitrile gloves. Brake fluid causes severe eye irritation and strips skin of oils.
• Vehicle Stabilization: Use jack stands on solid ground. Never rely solely on a hydraulic jack. Chock wheels that remain on the ground.
• Fluid Contamination: Never reuse brake fluid from the catch bottle. Keep new fluid containers sealed until use to prevent moisture absorption.
• Fire Hazard: Brake fluid is flammable. Keep it away from open flames, sparks, and hot engine components.

Top 5 Brake Bleeding Mistakes on the F-150

These common errors lead to a spongy pedal, wasted time, and frustration. Awareness is the first step to avoiding them and achieving professional results on your first attempt.

1. Letting the Master Cylinder Run Dry: This introduces a massive amount of air, forcing you to start over. Check and refill it after every 2-3 pedal pumps.
2. Incorrect Bleeding Sequence: Not following the “farthest to closest” order traps air in long brake lines. Always follow the specified sequence.
3. Over-Tightening Bleeder Screws: These are small and hollow. Snug is sufficient; overtightening strips threads or snaps them off, creating a major repair.
4. Using Old or Wrong Fluid: Contaminated fluid or the wrong DOT type (e.g., DOT 5) damages seals and compromises the entire hydraulic system.
5. Skipping the Final Bed-In: After bleeding, you must properly bed-in new pads or re-condition existing ones with a series of moderate stops.

Proper Disposal of Used Brake Fluid

Used brake fluid is a hazardous waste product. It contains toxic metals, moisture, and is corrosive. Never pour it down a drain, on the ground, or into regular trash.

Collect all used fluid in a clearly labeled, sealable container. Take it to a local household hazardous waste (HHW) collection facility, an auto parts store that accepts it, or a professional service station. This protects the environment and complies with local regulations.

Final Checkpoint: Before driving, perform this simple test. With the engine running, apply steady, firm pressure to the brake pedal for 30 seconds. The pedal should not slowly sink toward the floor. If it does, you likely still have air or a leak in the system.

When to Seek Professional Help for Brake Bleeding

While DIY brake bleeding is achievable, certain situations warrant a professional mechanic’s expertise. Recognizing these scenarios can save you from costly mistakes and ensure your safety. Knowing your limits is a sign of a smart technician.

Signs Your Brake Problem is Beyond Simple Bleeding

A standard bleed won’t fix underlying mechanical or hydraulic failures. If you encounter these symptoms, the issue is more complex. Diagnosing the root cause requires professional tools and knowledge.

• Pedal Sinks to Floor: A pedal that slowly sinks under constant pressure indicates a leaking master cylinder or wheel cylinder.
• Vehicle Pulls to One Side: This suggests a stuck caliper, collapsed brake hose, or contaminated pads, not just air in the lines.
• Grinding or Metal-on-Metal Noise: This signals severely worn pads or rotors, requiring immediate component replacement.
• ABS Warning Light is Illuminated: A lit dash light indicates an electronic fault within the ABS system that needs computer diagnosis.

Cost Analysis: DIY vs. Professional Service

Understanding the potential costs helps you make an informed financial decision. While DIY is cheaper in parts, professional service includes expertise, warranty, and time savings. Compare the typical investment below.

Service Aspect	DIY Bleed	Professional Service
Estimated Parts Cost	$20 – $60 (fluid, basic kit)	Included in service quote
Estimated Labor Cost	Your time (2-3 hours)	$100 – $200 (1-1.5 hrs labor)
Tools & Equipment	You must purchase/own them	Shop provides professional-grade tools
Expertise & Diagnosis	Your skill level	Certified mechanic’s diagnosis included
Warranty/Guarantee	None	Typically includes a service warranty

What to Expect from a Professional Brake Flush Service

A pro service is more than just bleeding; it’s a complete system flush and inspection. Technicians follow a rigorous process to ensure total system integrity. This provides peace of mind and often extends component life.

1. Comprehensive Inspection: A mechanic will inspect pads, rotors, calipers, hoses, and lines for wear or damage before starting.
2. Machine-Assisted Flush: Many shops use a pressure flush machine that exchanges 100% of the old fluid, ensuring no old fluid remains in the ABS module.
3. ABS Module Cycling: They will use a professional scan tool to activate the ABS pump and solenoids, purging any trapped air automatically.
4. Final Road Test: The vehicle is test-driven to verify pedal feel, stopping power, and the absence of pull or noise.

Decision Guide: Choose DIY if you are comfortable with the procedure, have the tools, and are dealing with routine maintenance. Choose a professional if you have warning lights, suspect mechanical failure, lack the proper tools for ABS service, or simply value guaranteed results and your time.

Best Tools for Brake Bleeding – Detailed Comparison

Motive Products Power Bleeder 0100 – Best Overall System

The Motive 0100 is a pressurized master cylinder adapter kit that makes one-person brake bleeding simple and efficient. Its specific Ford F-150 adapter (included) creates a perfect seal. You get consistent pressure for a complete, bubble-free flush without needing a helper to pump the pedal.

Mityvac MV8500 Silverline Elite – Best Manual Vacuum Pump

This professional-grade vacuum pump and bleeder kit is ideal for precise control and portability. The MV6835 draws fluid and air from the caliper bleeder screw with strong vacuum. Its see-through catch bottle lets you monitor fluid condition, making it perfect for spot-bleeding or checking for air.

Phoenix Systems 7002-B-One Man Brake Bleeder – Best Budget-Friendly Kit

The Phoenix EZ-Bleed is a simple, effective two-person brake bleeding kit that uses tire air pressure. It includes a universal cap and a clear hose with a check valve to prevent air backflow. This affordable tool is a fantastic upgrade over the basic hose-in-a-bottle method.

Conclusion: Mastering Your Ford F-150 Brake Bleeding

Successfully bleeding your F-150’s brakes restores critical stopping power and safety. This guide has equipped you with the step-by-step process, expert techniques, and essential troubleshooting knowledge. You can now tackle this vital maintenance task with confidence.

The key takeaway is to follow the correct sequence and use the right fluid. Always prioritize safety and double-check your work. A firm brake pedal is non-negotiable for safe driving.

Gather your tools, review the steps, and take control of your truck’s performance. Share your success or questions in the comments below. Your experience can help fellow F-150 owners.

With patience and this guide, you’ve mastered a fundamental skill that ensures your truck stops reliably for miles to come.

Frequently Asked Questions about Ford F-150 Brake Bleeding

What is the correct brake bleeding sequence for a Ford F-150?

The proper sequence is farthest wheel to closest wheel relative to the master cylinder. For most F-150s, this means starting at the right rear passenger side, then left rear, right front, and finally the left front driver side. This path ensures air is pushed out through the longest lines first.

Never deviate from this order, as air can become trapped in the system’s high points. Always double-check your specific model year in the owner’s manual, as some configurations with specialized ABS may have slight variations.

How often should I bleed the brakes on my F-150?

There is no strict mileage interval, but brake fluid should be flushed every 2-3 years. Fluid absorbs moisture over time, which lowers its boiling point and causes internal corrosion. This degradation happens regardless of mileage.

Bleed the system immediately if you notice a spongy pedal, after replacing any hydraulic component (caliper, hose, master cylinder), or as part of routine brake pad service. Annual fluid moisture testing is a smart preventative practice.

What is the best way to bleed brakes by yourself?

The most effective solo method is using a dedicated one-person brake bleeder kit. A pressurized system like the Motive Power Bleeder or a vacuum pump like the Mityvac provides consistent results without a helper. These tools prevent air from being sucked back into the caliper.

If you lack a kit, you can use a clear hose and bottle method, but vigilance is key. You must carefully pump the pedal and constantly monitor the master cylinder fluid level to prevent it from running dry and introducing more air.

Why is my brake pedal still soft after bleeding my F-150?

A persistent soft pedal usually means air remains trapped in the system. The most common culprit on modern trucks is air locked inside the Anti-lock Braking System (ABS) module. Standard bleeding does not activate the ABS valves to purge this air.

You need a professional OBD-II scan tool with ABS bi-directional control to cycle the pump and solenoids. After this activation, you must perform the standard four-wheel bleeding procedure again to remove the displaced air.

Can I use DOT 4 brake fluid in my F-150 that calls for DOT 3?

Yes, DOT 4 fluid is generally compatible with DOT 3 systems and is often recommended as an upgrade. DOT 4 has a higher dry and wet boiling point, which improves performance under heavy use like towing. It is a common factory fill in newer trucks.

However, you should never use DOT 5 silicone-based fluid in a DOT 3/4 system, as it is not compatible and will cause seal failure. Always use fresh, sealed fluid from a known brand to ensure quality and prevent contamination.

Do I need to bleed my brakes after just changing the pads?

Typically, no. A simple pad replacement does not open the sealed hydraulic system, so air cannot enter. You should only need to bleed the brakes if you opened a bleeder screw, disconnected a brake line, or compressed a caliper piston so far that fluid was forced back into the reservoir.

However, it is a perfect opportunity to check your fluid level and condition. If the fluid is dark or you’re near the 2-3 year mark, a full flush during pad service is excellent preventative maintenance.

What’s the difference between bleeding and flushing brakes?

Bleeding focuses on removing air from the system to restore a firm pedal. It often uses the existing fluid to purge bubbles. Flushing is the complete replacement of all old brake fluid with new fluid to remove moisture, contaminants, and degraded fluid.

A flush is a more comprehensive service that involves bleeding until the fluid exiting each caliper runs completely clear. Most professionals recommend a full fluid flush every 2-3 years as part of regular maintenance, not just bleeding when a problem arises.

How do I bleed the brakes on an F-150 with an electronic parking brake?

For models with integrated electronic parking brakes (EPB), you must put the system into “Service Mode” before retracting the rear caliper pistons. This is typically done through the vehicle’s dashboard information screen menu or with a compatible scan tool.

Never force the piston back without engaging service mode, as you can damage the expensive caliper motor. Once in service mode, you can proceed with the standard bleeding procedure. Remember to deactivate service mode when finished.

How Long Does It Take to Bleed Brakes on an F-150?

The time required depends on your method, experience, and whether you encounter problems. A straightforward two-person bleed on a standard system is relatively quick. Complex systems or solo work will take longer.

• Two-Person Method: Approximately 45 minutes to 1.5 hours for a complete four-wheel bleed, including setup and cleanup.
• One-Person / Tool Method: Slightly longer, about 1 to 2 hours, as you manage the tool and check fluid levels alone.
• With ABS Service: If using a scan tool to cycle the ABS module, add 30-45 minutes for the activation and re-bleeding process.
• First-Timer Factor: Allow extra time for learning. Your second attempt will be significantly faster.

Can I Bleed My Brakes Alone Without a Special Tool?

Yes, it is possible but more challenging and less effective. The traditional “one-person” method involves a length of clear hose and a bottle partially filled with fluid. This technique relies on gravity and careful pedal work.

Attach the hose to the bleeder screw and run it into the bottle’s fluid. Open the bleeder screw, then slowly pump the brake pedal by hand from inside the wheel well. The major risk is allowing the master cylinder to run dry, as no one is watching the reservoir.

Why is My Brake Pedal Still Spongy After Bleeding?

A persistent spongy pedal is the most common frustration. It indicates that air remains somewhere in the hydraulic system. The cause is usually one of these specific issues.

Possible Cause	Why It Happens	Next Step
Air in the ABS Module	Standard bleeding doesn’t activate the ABS valves, trapping air inside.	Cycle ABS with a scan tool, then re-bleed.
Master Cylinder Issues	Internal seals are leaking, or it wasn’t bench-bled after replacement.	Bench-bleed the master cylinder or replace it.
Improper Bleeding Sequence	Air is trapped in the longest brake line.	Re-bleed the entire system using the correct “farthest to closest” order.
Worn Brake Components	Flexing rubber hoses or severely worn parts can mimic a spongy feel.	Inspect hoses, calipers, and pads for wear or damage.

Is It Necessary to Bleed All Four Brakes?

In almost all cases, yes, you must bleed all four calipers. The hydraulic system is interconnected, and air can migrate. Bleeding only the wheel where you opened the line is insufficient for a complete repair.

The only exception is a minor “spot bleed” to remove a tiny bubble at a specific caliper after a known, localized air introduction. Even then, following the full sequence is the best practice to ensure a perfectly firm pedal.

Quick Tip: If you’re unsure whether air is the problem, try this: With the engine off, pump the brake pedal several times until it gets firm. Hold strong pressure. If the pedal slowly sinks to the floor, you likely have a fluid leak or failing master cylinder, not just air.