Front brakes heating n locking up.

Topic: Front brakes heating n locking up. (Read 1332 times) previous topic - next topic

Front brakes heating n locking up.

April 27, 2007, 02:13:59 AM

I just had the master cylinder replaced on my yellow 86'. It's 5 lug now, and I also just had the rear rotors replaced (Lincoln of course). The front brakes are locking up after driving it for at least 20 minutes. Anyone have any ideas, or experience this after going to 5 lug?
After the car sits and cools, it goes back to normal by the way. No lock up.

Front brakes heating n locking up.

Reply #1 – April 27, 2007, 04:38:23 AM

possible front brakes binding? could be too tight on the rotors causes excessive heat build up then causeing them to lock up??

Front brakes heating n locking up.

Reply #2 – April 27, 2007, 10:00:06 AM

I believe you'll find that you'll have to remove the M/C and adjust the pushrod a little shorter. Hopefully you should be able to do so without loosening any brake lines (which would require bleeding the system)...

Front brakes heating n locking up.

Reply #3 – April 27, 2007, 10:11:32 AM

Yep, it's the pushrod. I know this veerryyyy well.

Front brakes heating n locking up.

Reply #4 – April 27, 2007, 10:27:37 AM

It's also possible that if you have phenolic pistons in the front calipers, it's also possible that's the cause. They get old, they get hot and the pistons start binding in the bore. I've had that happen a couple times on the 11" Fox calipers (mostly the 73mm ones)

Front brakes heating n locking up.

Reply #5 – April 28, 2007, 11:59:40 PM

Thanks for the info guys. :D

Front brakes heating n locking up.

Reply #6 – April 29, 2007, 01:10:15 PM

or,,, the caliper line where the rubber is crimped to the metal,, that rubber will begin to age along the interior of hose at the crimp. The rubber will flake or peal acting as a one way valve perse'. fluid goes to the caliper but has a hard time returning to the master.

Usually happens on the pass side earlier than the driver.

Does your steering wheel wobble (a little / lot) when you hit the brakes? sure sign that fluid is trapped and unable to bleed back.

also what chuck said,, my passanger side was harder to compress than the driver. I undid the brake line to see if the problem was still there (isolating the problem just to the caliper) and the piston was was not binding. That told me the issue was not the caliper although i just replaced them anyway as a set.