Brake Lock Up!!
Thread Starter
3rd Gear
Joined: Feb 2023
Posts: 3
Likes: 0
Brake Lock Up!!
I’ve got a 94 that has brake problems. The front brakes lock up about 5-10 miles down the road after braking a few times. I’ve replaced calipers, brake pads, brake booster, brake hoses like people have suggested but nothing worked. I have ABS, ASR, BRAKE lights on. I’ve took it to several mechanics but none of them know what’s wrong with it!
Melting Slicks
Joined: Jul 2005
Posts: 2,649
Likes: 863
Have you replaced the Master Cylinder ???
I'm assuming that if you crack a brake bleeder screw the impacted caliper releases.
I would try killing the power to the ABS system, and see if the issue "goes away".
I'm assuming that if you crack a brake bleeder screw the impacted caliper releases.
I would try killing the power to the ABS system, and see if the issue "goes away".
Drifting
Joined: Jan 2005
Posts: 1,354
Likes: 325
From: San Antonio Tx
Afer replacing the booster did you adjust the master cylinder push rod? The master cylinder push rod length is adjustable. If it is too long it won't allow the piston to return far enough to release all of the pressure after a little heat expansion. Easy way to check is loosen the two master cylinder bolts while the brakes are locked up. If that releases the pressure adjust the push rod lengtth.
Thread Starter
3rd Gear
Joined: Feb 2023
Posts: 3
Likes: 0
I have no replaced the master cylinder yet. I plan on doing so and how exactly do u kill the power to the abs. I have pulled the fuses to the abs before and it did nothing. is there another way or a step I missed?
Thread Starter
3rd Gear
Joined: Feb 2023
Posts: 3
Likes: 0
Afer replacing the booster did you adjust the master cylinder push rod? The master cylinder push rod length is adjustable. If it is too long it won't allow the piston to return far enough to release all of the pressure after a little heat expansion. Easy way to check is loosen the two master cylinder bolts while the brakes are locked up. If that releases the pressure adjust the push rod lengtth.
Melting Slicks
Joined: Jul 2005
Posts: 2,649
Likes: 863
If disconnecting the ABS causes the problem to go away - the problem is in the ABS. If it doesn't go away - it's somewhere else in the brake hydraulic system.
