Question about 1998 Plymouth Breeze
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
By any chance did you install new calipers??
Posted on May 15, 2010
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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Posted on Jan 02, 2017
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