Saturday I was driving and I eventually got the feeling something was holding back my car. Thinking it was a really low, or flat tire I pulled over at a gas station to get air... the tires are fine. So I get in the car and start driving again, and it gets to the point that I was in boost just to keep cruising. I pulled over and found out that all four rotors and/or pads were smoking a little bit. Also the brake pedal was rock hard.
I let the car sit for about 15 minutes, got in the car, started it and it was back to normal. I drove the car home.
It felt/seemed as if while I let the car sit something having to do with the brakes released/adjusted vacuum or pressure levels.
Do these cars have any one way valves or anything that could be failing? What exactly makes the pressure release from the brakes on these cars?
I'd start with changing the brake fluid. Flush all the old out with new.
The brake booster check valve is in the hose off the back of the intake manifold to the booster.
If you said one brake rotor was getting hot I would say a collapsed line, but all four, I suspect contaminated fluid boiling causing the brakes to self apply. The 15 minute break gave the fluid time to cool down and contract releasing the brakes.
Originally Posted by Ondontii
If you can't sit in traffic, its not a street car.
As stupid as this is, a few months ago I added what I thought was brake fluid to the reservoir. It wasn't... it was power steering fluid. I figured since it was a tiny tiny amount I'd be fine. Well, apparently not. Again, stupid stupid stupid.
And you know it took balls to admit that one, but as long as it helps figure out the problem .
This has been posted about before. Its not boiling fluid. Its either a vacuum issue at the booster, or the master cylinder is causing issues.
How does vacuum at the booster self apply the brakes, and even then only when hot? The worst case scenario I see with the booster is the pedal being firm from a busted diaphram and no vacuum assist, not self applying.
The master cylinder, I could see now that OP has stated he used PS fluid in the brake system, but it doesn't explain why they released when they cooled. A misadjusted pedal maybe but I'm assuming OP didn't have this issue before he added fluid to the system.
An overfilled system WILL do this once the fluid gets hot and expands.
PS fluid in the brake system will swell the seals in the brake system. Flush the system with clean brake fluid.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.