need help.........again
Thread Starter
Burning Brakes
Joined: Jan 2004
Posts: 791
Likes: 1
From: lincoln ri
need help.........again
I know I have had some odd posts, but I have a problem that has already been through two mechanics, including a dealer. I recently got my car back after an accident. Since it came back, when I apply the brakes, I hear a hissing noise. If I apply the brakes, let up, then step on the pedal again, the brake pedal feels super hard, and the car is difficult to stop. However, if I just step on the pedal and keep it there until it stops, it feels fine. I was leaning toward a brake booster check valve problem, or a leak in the vacuum hose. These seem to check out. Any ideas???? I also had installed a new carpet. Is there some kind of mechanism on the brake pedal that I could have dislodged???? I don't get the hissing noise unless the car is moving. If I apply the brakes while parked, I don't get it. Thanks in advance for any ideas........
I should add that the engine idle seems to fluctuate slightly also during the braking process. I seem to have a good vacuum at the manifold connection.
I should add that the engine idle seems to fluctuate slightly also during the braking process. I seem to have a good vacuum at the manifold connection.
Last edited by vetteboy88; Apr 24, 2006 at 02:04 PM.
Drifting
Joined: Nov 2000
Posts: 1,428
Likes: 1
From: Jacksonville FL
Sounds like a vacuum leak to me. I would think in the booster itself from what you describe. If you can find a hand vacuum pump, pump it down to 10-15 inches of vacuum and have it hold there if it will. If it is holding press the brake pedal and see if it loses vacuum.
I'm not an expert in these matters but, I did stay at a Holiday Inn Express last night. J/K.
I'm not an expert in these matters but, I did stay at a Holiday Inn Express last night. J/K.
Thread Starter
Burning Brakes
Joined: Jan 2004
Posts: 791
Likes: 1
From: lincoln ri
Thanks again guys. the check valve was fine, it was the brake booster diaphragm. I haven't run it yet, but I'm sure that was the problem thanks to the test described above. I replaced the brake booster today, and it was a moth#@#@#%$#. Actually, it was easy except for one of the threaded rods which was conveniently located to close to the steering column. Thanks and a tip of the hat again.
