Brakes Seem to Stick
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
Brakes Seem to Stick
I have a 1992 ZR1. The brakes don’t seem to completely release when I take my foot off the pedal. They do eventually but not right away. What could be the cause of this? I am not 100% if it is just the front, rear or both. Will confirm this weekend.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Does it do it all the time, or after driving and everything is hot? Possibility the actuator rod on the booster may need a slight adjustment if it is pushing on the master when it should not. It may need one turn just to back off on it. The master does not have to be removed to make the adjustment. Just loosen with 2 bolts and pull back.
Can also try picking up the pedal with the top of your foot and see if that changes anything.
A check of the system can be made jacking the front end up and rotating the wheels. If they are really hard to turn it could be the actuator rod is too long. Slight drag is OK, turn with one finger.
If it was one caliper it would pull but you're not saying that.
Can also try picking up the pedal with the top of your foot and see if that changes anything.
A check of the system can be made jacking the front end up and rotating the wheels. If they are really hard to turn it could be the actuator rod is too long. Slight drag is OK, turn with one finger.
If it was one caliper it would pull but you're not saying that.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Doubt if your flex lines are bad. When they restrict, they don't release and would probably be one side and really pull that direction.
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
Pro
Joined: Apr 2008
Posts: 502
Likes: 37
From: Pine Barrens New Jersey
Rubber can behave in inconsistent ways. So basically yes that's what I'm saying. There may be plenty of pressure when applied to "convince" the rubber to open up but when released the rubber might not let the fluid back as quickly. It might bleed down slowly over time. One way to check is you can have someone step on the brakes and spin the tire as soon as they let off to see the resistance right after they let go. If after checking or replacing the lines the problem persisted I would suspect a caliper and then the ABS. This all assumes the problem showed up out of nowhere and you have not been working on any part of the brake system recently. I would not hunt down phantom metal expansion issues.
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Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,738
Likes: 53
From: Bogart GA
Update: I know it has been awhile but the car does not get driven much. The rubber brake lines are in like new condition do I doubt that is it plus I would think any residual pressure should bleed off fairly quickly once the brakes are released. The grab after I release the brake pedal but gradually bleed down over a period of minutes. If this was a brake push rod issue, I doubt that short of time would make a difference. It appears to be all 4 corners which rules out a 1 off caliper issue. That leaves the ABS which is probably not a good thing or possibly the master cylinder. It is not causing any issues and the brake pad wear seems fine. It is like having a "Hill Hold' option when stopped on a hill. At first that is what I thought it was....thought damn.....they had that technology back in 1992?