Question about 1998 Plymouth Breeze

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Brakes stay soft even though they have been bled and the brake booster replaced. It sounds like there is an air leak somewhere. I replaced the master cylinder as well then they were bled and still I have bad brakes. You almost have to stand on them to get them to stop. Please HELP!!!

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  • Plymouth Master
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If there are no brake line/fitting leaks and no crimped or bent brake lines/hoses:
The key to my answer is the sound of air leaking...
Check the Brake Booster to the rear of the Master Cylinder.
1. Check the Vacuum Hose going to the Air Resonator with the one way check valve. Make sure the Vacuum Hose does not have cracks, holes, etc.; or does not collapse with the engine on. If there are any problems with the hose - replace the hose. With the engine on: remove the Hose for the Resonator and check for a vacuum. CAREFULLY: Remove the Resonator and reconnect it to the Vacuum Hose. Again check for the presence of a vacuum coming from the inside of the Resonator. If the Hose had a vacuum, but the Resonator does not = Replace the Resonator. If there is a Vacuum - Reconnect the Vacuum Hose and Resonator to the Brake Booster

2. Checking the Brake Booster Seals:
a. While the Engine is running: Push in the brake pedal. Stop the Engine while keeping the Brake Pedal pushed in.
(1) If there is a change = the Brake Pedal sinks to the floor: The Brake Booster has a Air Leak.
(2) If there is no change = GO TO TEST 2 (#3 below)

3. Turn the engine on and wait a couple of minutes and turn the engine off. Push in the Brake Pedal several times.
a. If the Pedal goes down farther the first time, but continues to rise = gets harder after the 2nd, 3rd time the Brake Booster is fine.
b. If the Pedal continue to go farther down on each push = the Brake Booster has a leak.

One seal in particular - located where the Brake Booster is attached to the Fire Wall - located behind the Brake Pedal Arm. Check the mounting bolts for tightness. With the engine on and a partner pushing on the Brake pedal: try to determine if that rear seal is where the air is leaking from.
Any Air Leak in the Brake Booster Main Seals = a new (remanufactured) Brake Booster must be purchased, as these are not repairable.

Let me know if this helped. or if you have additional information or questions. Feel Free to contact me at FixYa.com!

Posted on May 13, 2010

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By any chance did you install new calipers??

Posted on May 15, 2010

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  • Expert
  • 92 Answers

Check the flexible hoses from the wheel calipers to the chassis tubing.
If these are perished then they can balloon and you get spongy/soft brakes.
This may not show on the outside!

Posted on May 13, 2010

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When i press the brake pedal on my 2003 chevy tahoe there is a loud whooshing sound, what is causeing this?


maybe the vacuum booster behind the master cylinder. is the vacuum hose hooked up to it?? it could be leaking internally. you need a vacuum pump to test it though.

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1992 chevy siverdado 1500 Has new master cylinder,booster,brake calipers bled all lines back to front.drove a round the block The brake are soft with a hissing noise go to the floor some times.


Had the exact same issue with an 04 Cadillac srx. Replaced the booster twice...finally put my old "defective" master cylinder back on and brakes worked fine. Turned out the new master cylinder was bad...even though the symptoms point to the booster. Do check the vacuum hose going to the booster first though. Have seen those go bad and cause weird problems and it's the easiest thing to check first.

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Even after replacing front and rear brakes, the pedal goes nearly to the floor (but does stop the vehicle). What do I need to do


Brake booster has gone bad or u have a vacuum leak. Check the seals for leaks around booster where the. Fluid goes in the plastic holder. Check for vacuum leak going to break booster

Apr 15, 2015 | 1999 Plymouth Breeze

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Just replaced rotors, calipers, caliper brackets, and pads. Bled all four wheels, starting with the farthest away from the master cylinder working my way to the closest. Brake pedal feels firm when car...


Bleed with the car running and make sure all the air is out. Now make sure there is no leak and the pad contact are adjusted without much gap so that the calipers hold on. make sure the servo assist is correct, if so and the master cylinder was set right , it must work. Please recheck all your work once again to trim up.

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Brake pedal goes to the floor? replaced all the brakes and bled them. worked for very short time and now the pedal goes to the floor.


If the fluid level is staying constant then it sounds like the brake master cylinder or the master cylinder booster. If the seals are bad on the master cylinder the piston just goes through the fluid. Many boosters use air pressure to assist in the braking proces and it could have a leak.

Mar 14, 2010 | 1996 Chrysler Town & Country

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Install new brake pads and rotors all 4 wheels. Replaced front 2 calipers. Bled brakes. New clean fluid coming out. pedal is still soft and goes to floor. 200 Seebring.


Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
Are you losing Brake Fluid and can't find a noticeable leak? Then there is a good posibility that the rear seal in the Master Cylinder is leaking and the Fluid is going into the Brake Booster - which is the large wheel shaped drum located on the fire wall. In this case both the Brake Booster and the Master Cylinder will have to be removed and replaced. The Booster contains seals that Brake Fluid is very caustic to and will ruin these seals- causing future failures.
If no Brake Fluid is lost, no leak found: Check the Brake Booster Vacuum Advance. This should be connected to the outside of the Booster, attached to a hose, with the hose going to the engine. Check to see if this is working properly. Replace if needed.

Dec 31, 2009 | 2002 Chrysler Sebring

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Replaced Master Cylinder and Brake Booster on 03 Bravada and pedal still drops all the way to the floor instead of stopping at half-way of pedal travel? No visible leaks in hydraulic system but it acts...


Did you replace the master cylinder and booster because of this? If so then did this problem follow any maintenance done on the brakes? Was there any leaks prior to the replaced parts?
The pedal dropping to the floor with no leaks would point to items you have already replaced or air in the brake lines. Normally though this follows a break job.

It could be that you had a bad master or booster and the brakes were not properly bled after their replacement. This could seem like the same problem but with different sources.

This may seem obvious to some to bleed the system after any work but even if you did this already you should do it again. Bleeding air from the master all the way to the rear cylinders takes quite a bit of time.

Hope this helps but if not please let me know the answers to the questions at the top.

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1 Answer

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You may have a leak in the booster or master cylinder. You can put a pressure tester on the system to test for leaks. It does sound like you have an air leak.
You can try to bleed the master cylinder, then slave cylinder, then brake lines.

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