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Brakes slowly lock up after driving 10 miles


roscoscott

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75 Z

I installed a new brake booster, 4 piston calipers on the front, disk on the back and a master cylinder off a 82 Z.

problem:

After putting on brakes in stop and go traffic for about 10 miles the brakes get stiffer and stiffer until they lock up. I can unbolt the master cylinder and the wheels will turn again. bolt it back on and drive again and does it again.

question:

What is going on man!

Is the booster defective?

Please help

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I had this same problem, and the front brakes were locking. If I released the master front bleeder it was OK for a while. The problem was the master cylinder.

Perhaps you could try your original master cylinder to isolate the problem.

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Still have the push rod length too long me thinks.

Might want to check out this thread on Hybridz.

http://forums.hybridz.org/index.php/topic/102754-a-one-inch-diameter-brake-master-cylinder-for-the-s30-z-cars/

It has a section on properly setting the length of the push rod.

At the bottom of post #1 is a link that contains an excellent article on the subject. Definitely worth reading.

Other than that its the master itself that may be bad.

Edited by zKars
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I agree with Cbuczesk and Zcars........your pushrod is too long. You need to readjust to a shorter length.......your master cylinder is holding your pads against your rotors at all times. This in turn heats the rotors and expands the calipers causing your brakes to finally lock up. Be careful....it can get so hot that it warps your rotors. IMO

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The push rod wouldn't adjust. (It's stuck) So I put two washers in-between the master and booster. I drove it around the 10 mile loop and they progressively got tighter and tighter until they finally locked up. I unbolted the master and the wheels freed up.

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Try 4 washers. Mine locked up at work and all I had were some pennies to use as spacers. Best of all I got to do it in the dark! LOL

Chuck

It happened to me at a red light. LOL I read a few post in the Hybrid and they say the same thing. I'll try it this weekend.

Thanks for the help

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