Brakes locking up
Thread Starter
Instructor
Joined: Jul 2012
Posts: 174
Likes: 6
From: McDonough Georgia
Brakes locking up
Hey guys,
Since replacing my brake booster I've noticed that after a short drive my brakes start to lockup. The only way to get moving again is to open the bleeder valve on the master cylinder.
Does anyone have any idea what might be the cause of my problem?
Thanks!
Since replacing my brake booster I've noticed that after a short drive my brakes start to lockup. The only way to get moving again is to open the bleeder valve on the master cylinder.
Does anyone have any idea what might be the cause of my problem?
Thanks!
Thread Starter
Instructor
Joined: Jul 2012
Posts: 174
Likes: 6
From: McDonough Georgia
That's what I suspected. All the hoses are new so it must be the push rod. I guess I have to pull the M/C to adjust the rod right? And how far should it extend once I have access to it?
Drifting
Joined: Jul 2009
Posts: 1,534
Likes: 14
From: Dallas-Fort Worth TX
Just did this job less than a year ago. You need a shorter rod between the MC and the booster.
Same thing happened to me. I used longer rod that came with the new booster,
2 miles down the road, the brakes were probably at 30% applied, I crippled her back home at 10 mph, as to not burn up the rotors. Replaced the rod with original shorter one and that solved the problem. It doesnt take much, 1/8" can make a difference.
You can also unscrew the MC from the booster and that will back the pressure off if your stranded.
Same thing happened to me. I used longer rod that came with the new booster,
2 miles down the road, the brakes were probably at 30% applied, I crippled her back home at 10 mph, as to not burn up the rotors. Replaced the rod with original shorter one and that solved the problem. It doesnt take much, 1/8" can make a difference.
You can also unscrew the MC from the booster and that will back the pressure off if your stranded.
Thread Starter
Instructor
Joined: Jul 2012
Posts: 174
Likes: 6
From: McDonough Georgia
Just did this job less than a year ago. You need a shorter rod between the MC and the booster.
Same thing happened to me. I used longer rod that came with the new booster,
2 miles down the road, the brakes were probably at 30% applied, I crippled her back home at 10 mph, as to not burn up the rotors. Replaced the rod with original shorter one and that solved the problem. It doesnt take much, 1/8" can make a difference.
You can also unscrew the MC from the booster and that will back the pressure off if your stranded.
Same thing happened to me. I used longer rod that came with the new booster,
2 miles down the road, the brakes were probably at 30% applied, I crippled her back home at 10 mph, as to not burn up the rotors. Replaced the rod with original shorter one and that solved the problem. It doesnt take much, 1/8" can make a difference.
You can also unscrew the MC from the booster and that will back the pressure off if your stranded.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
If your 'rod' is too long (never been a problem of mine), then you just need to shorten what you presently have. Remove the M/C (no need to take the lines off) and remove the rod. Use the 'depth' probe on your dial caliper to measure the depth of the recess on the M/C and on the booster [selecting appropriate surfaces to measure from].
Using those numbers (and any other dimensions from the booster or M/C that you need to calculate the total space available for the rod, once the assembly is put together), cut the rod to slightly less than that length (.005" to .010" clearance would be good). You do NOT want that rod to be longer than the space where it is to fit.
Note: the ends of the rod may need to be rounded to fit into a rounded recess. Evaluate as necessary.
Using those numbers (and any other dimensions from the booster or M/C that you need to calculate the total space available for the rod, once the assembly is put together), cut the rod to slightly less than that length (.005" to .010" clearance would be good). You do NOT want that rod to be longer than the space where it is to fit.
Note: the ends of the rod may need to be rounded to fit into a rounded recess. Evaluate as necessary.
Last edited by 7T1vette; Jul 9, 2017 at 05:39 PM.
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