Brake problems

[pbrizzle86]

about a week ago my master cylander went out and took the booster with it replaced bolth and the front calipers and hoeses. i can drive the car fine for about 5 -10 min and then the front brakes stay stuck on and the pedal becomes rock hard i dont understand everything is new and works properly for a little while and then just stops. any help would be great.

[FrodoGT]

Well if you say they stay on..what makes them unstick?

[pbrizzle86]

i dont know every time it has done this i have let it sit over nite and come back to it the next day and the brakes have relaeased

[CRXperiment]

Maybe you've got air in your system or a hole in one of your brake lines?

[pbrizzle86]

i have looked over all the lines and hoses replaced the front hoses the rear was fine and bleed them over and over and over .they work perfect for a little while and then all of a sudden ill go to brake and the pedal is like a rock and the fronts are stuck on and wont release

[bambam89lx]

Originally Posted by pbrizzle86

about a week ago my master cylander went out and took the booster with it replaced bolth and the front calipers and hoeses. i can drive the car fine for about 5 -10 min and then the front brakes stay stuck on and the pedal becomes rock hard i dont understand everything is new and works properly for a little while and then just stops. any help would be great.

possibly your master cylinder is sticking. Did you bench bleed your MC?

[pbrizzle86]

yes i bench bleed the mc there was no air in it when i installed it.i think i figured out the problem anybody know of an easy way to adjust the push rod that conects to the pedal

[bambam89lx]

Originally Posted by pbrizzle86

yes i bench bleed the mc there was no air in it when i installed it.i think i figured out the problem anybody know of an easy way to adjust the push rod that conects to the pedal

yah, lay down in the driver's side footwell with a flashlight or drop light. I think it's either a 12 or 14mm...use a box wrench and tighten it.

[FrodoGT]

Haha! Ive spent more time in the footwell of my car than my feet have...But yeah, its right there, down..then up, way up!

[pbrizzle86]

it seems like no matter where i position the clip for the pedal i get the same result its driving me nuts .the only way i can get the brakes to act normal and the brakes to realease is to losen the m-c from the booster enough to break the air seal and then the brakes work like the should.

[bambam89lx]

Originally Posted by pbrizzle86

it seems like no matter where i position the clip for the pedal i get the same result its driving me nuts .the only way i can get the brakes to act normal and the brakes to realease is to losen the m-c from the booster enough to break the air seal and then the brakes work like the should.

did you mess with the check valve on the booster (the white valve above the MC)?

[pbrizzle86]

the check valve seemed fine there was plenty of vacum when i tested it

[Smoghog]

Originally Posted by pbrizzle86

the check valve seemed fine there was plenty of vacum when i tested it

I know this sounds stupid but did you put the check valve on in the wrong direction??? Look on it there should be a little arrow that points to the engine.

If that is not it you might have a kinked line somewhere??? Just guessing at this point...
SH

[bambam89lx]

Originally Posted by pbrizzle86

the check valve seemed fine there was plenty of vacum when i tested it

yah, that's why i was asking, it only works in one direction. Also, make sure your booster is tightened down. You didn't need to replace the booster anyway, as it is only a vacuum chamber and has no moving parts. Make sure it is not leaking.