Skdavisbob, This sounds like you have a problem with the brake booster that is attached to the firewall. When these boosters fail it is like trying to stop a house as you describe here. There is a one way check valve near the top of the booster that uses vacuum from the engine to operate. Inspect the hose and be sure that it is attached at both ends and that there are no leaks in this hose. This can be done by running the engine and listening for a leak. (hissing noise) Replace the hose if faulty. If you don't hear any vacuum leak then turn the engine off and pull the check valve out of the booster. This takes a little effort as it is quite secure in the grommet. You should hear a vacuum leak for a split second because when the valve is removed it will allow air in (if it is working properly) and you should hear the leak. If you don't hear the hiss, then test the valve by blowing through it both ways. As stated, this is a one way valve and you should be able to blow air through one way but not the other. If you can blow air both ways then the check valve is faulty. If the hose and valve are working properly then you will have to have the booster replaced. Good luck with this.
Get inside your car roll up the windows with the engine running press the brake pedal. If you hear air spewing while you press the brake pedal 99% chance that you're brake booster is bad you should not be able to hear air when you press that brake pedal. I wish you well on solving your problem I hope this helps.
HI,
Looks like a vacuum leak in the brake master servo.
Check the vacuum leakage at the bottom of the brake master( round black drum ), hose is connecterd on the side and it is connected to the intake manifold.
Hope that brakes solved.
Thanks for asking FixYa!
Check the vacuum to the brake booster to make sure the line is not loose. if the line is good and it has engine vacuum on the line with the engine running , then you have a bad brake booster.
SOURCE: brake pedal will not depress
Let the fluid out of the master cylinder or from a line. If the pedel then goes down w/o the fluid, then the booster is working ok. Rebuild or replace the master cylinder.
SOURCE: 1993 voyager 3.3 bake & abs light on - very hard pedal
Your Brake Master Cylinder is Failing. Get this Replaced and the Brake System Bled and it will work just fine. Please Rate My Response! Thanks!
SOURCE: 1993 toyota landcruiser brake problem
sounds like vacuum brake booster diaphram has failed. its behind master cylinder and probably needs replacing.
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