Tegraracer90

Alright I got a 95 Integra LS. I have had horrible brake problems with this car since I got it...most of them I think I took care of....but I got one that just puzzles me...and now that my car is commuted 80 miles a day to work...I wanna get it taken care of...

If I had been driving the car for about 5 minutes without touching the brake, then if I lightly step on the brake...The brakes grab real hard...then let off to about where they should be for the amount of pressure I am applying to the pedal.

I have Bled the brakes many times- No difference

Here is everything that has been done within the last year-

New Master Cylinder
New rear calipers and pads
New Rotors all around.
New front pads.

Tegraracer90

bump.....anyone?

el crapitan

proportioning valve?

racebum

less pressure on the pedal?

aggressive pads maybe? you could be use to **** organics

Tegraracer90

If i were to put any less pressure on the pedal i woudnt be touching it...as soon as it starts to move like a 1/4 of an inch they grab for about 3 seconds...then they let off...without me moving the pedal at all during this time.

I do know i have cheap pads on it....since of all the trouble i was having with the brakes before.

Circuit Star-29

Perhaps a dumb question but you never know... Is the Check valve installed correctly? And who installed the Master Cyl? There are steps involved to a correct installation.

el crapitan

^^if it were a backwards check valve, that would have the opposite effect. practically no brakes
my guess is either proportioning valve, or the master you got is crap

HECTIC

Sounds like a brake booster problem..A lot of times when people are bleeding their brakes they damage the booster by applying to much pressure. You should only need to press the pedal in about 80-90% when bleeding. Otherwise you can over extended your booster.

racebum

still a dying booster gives you a hard pedal, not super sonic brakes

any chance the rotors are warped? if so they can feel really grabby since the second the pads contact the rotor they hit a high spot and grab

nsxtasy

If they're warped you would feel a vibration/shudder when braking.

racebum

usually, i just have honestly, in ten plus years of wrenching on cars not seen this condition.

el crapitan

proportioning valve. or the piston in the MC is sticking. or did i already mention that?

el crapitan

or the only other thing i can think of would be a collapsed line. does it pull to one side when it grabs?

edit: post 500! oh goodie!

Tegraracer90

the rotors are slightly warped, nothing u would notice unless you were feeling for the vibration intentionally, i was thinking the booster also because i know if your MC leaks long enough and it gets brake fluid down inside the booster it can do all kinds of nasty things...


I am planning on complete maint. of the car within the next few months, Timing belt is due, Cam seals are leaking, VC is leaking oil and clutch is shot, so within that time i will prob. mess around with it some more and see what i can find.

el crapitan

won't be the booster

Prozon

Could be the proportioning valve.

Another thought is the master cylinder. Was it bench bled and installed properly?