92 Brake Problem
Thread Starter
Racer
Joined: Sep 2005
Posts: 271
Likes: 0
From: New Freedom PA
92 Brake Problem
Here is my problem , during the hot summer months , while in bad stop and go traffic. My brake start dragging , I can feel it while inching up in traffic , when the clutch is depressed the car rolls only a short distance and comes to a fairly firm stop.
Know I know its a heat problem do to lack of air flow but has any one else had this problem? Is it only a 6 Speed problem where you might not notice it with an automatic?
Here is what I have checked:
1.Brake master cylinder is NOT overfilled.
2.Master Cylinder cap vent is not plugged
3.All brake lines are tight and in their OE holders
4.NO exhaust mods or pipes replaced to create heat problems(all factory)
5.Brake fluid is NOT contaminated , its clean and clear
6.No air in brake system
7.engine running great , no rich conditions causing the Catalytic Convertors to glow red or heat up anything.
8.Engine coolant fans are working normally
Now if its the Cats are heating up under the hood or the brake lines on the frame rails what can be done? If a heat shield is needed why only on my Vette?
Any help appreciated (1992 LT1 Zf 6speed)
Desert
Know I know its a heat problem do to lack of air flow but has any one else had this problem? Is it only a 6 Speed problem where you might not notice it with an automatic?
Here is what I have checked:
1.Brake master cylinder is NOT overfilled.
2.Master Cylinder cap vent is not plugged
3.All brake lines are tight and in their OE holders
4.NO exhaust mods or pipes replaced to create heat problems(all factory)
5.Brake fluid is NOT contaminated , its clean and clear
6.No air in brake system
7.engine running great , no rich conditions causing the Catalytic Convertors to glow red or heat up anything.
8.Engine coolant fans are working normally
Now if its the Cats are heating up under the hood or the brake lines on the frame rails what can be done? If a heat shield is needed why only on my Vette?
Any help appreciated (1992 LT1 Zf 6speed)
Desert
Drifting
Joined: Jan 2006
Posts: 1,740
Likes: 2
From: Winchester Virginia
I had something similar with my 91, but it wasn't heat related and it was only associated with my right rear. When I replaced all of my brake calipers and rotors, I noticed that the slide pins on the right rear caliper were dry as a bone. My slide pins had no lubrication remaining, which made that specific caliper very sluggish and noisy compared to the others. Brake chirp at slow speeds, unusual wear of rotor and pads along with intermittent grinding noise were all symptoms. So you might want to look at that for starters on all of your calipers, all the way around.
R/Noland
R/Noland
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
May signal a stuck caliper and needs to be rebuilt. Lift in middle/both wheels off the ground. With your hand, spin the front and rear wheel to check drag. Repeat on the other side. You should easily spot the wheel that is dragging. Caliper piston not going back into cylinder.
Safety Car
Joined: Oct 2000
Posts: 4,229
Likes: 349
From: Albuquerque, NM
SAME thing happened with my '92 six speed a few years ago. It started off not too badly, just wouldn't roll as well as it should have after driving a bit. Over time it got worse. At the end, after I stopped the wheels would get too hot to touch and there was noticeable resistance while driving.
The problem is not a heat/air flow problem. Even here in Arizona in summer our cars shouldn't have this problem. You need to see which wheels are "sticking". After you drive the car, touch each wheel and see if one is hotter than the others. You can also jack up the car and try to spin the wheels. If it's just one wheel, you could have a sticking caliper.
In my case, the problem was in the master cylinder. Some small passage can get blocked with dirt and not allow pressure to be released. I had my master cylinder replaced, but I believe there's a way to take it apart and clean it. I don't remember if all four wheels were sticking or if it was just the fronts.
The problem is not a heat/air flow problem. Even here in Arizona in summer our cars shouldn't have this problem. You need to see which wheels are "sticking". After you drive the car, touch each wheel and see if one is hotter than the others. You can also jack up the car and try to spin the wheels. If it's just one wheel, you could have a sticking caliper.
In my case, the problem was in the master cylinder. Some small passage can get blocked with dirt and not allow pressure to be released. I had my master cylinder replaced, but I believe there's a way to take it apart and clean it. I don't remember if all four wheels were sticking or if it was just the fronts.
