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Unread 11-19-2013, 03:58 AM   #1
Fisher11
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1995 YJ Wrangler 
 
Join Date: Nov 2013
Posts: 2
95 YJ Brake Problem

Hi Guys, I have a strange problem with my brakes and I have searched and can't find anyone with a similar issue. The brake system on my 95 YJ is in pretty good shape. Many parts were replaced by PO (master cylinder, calipers, rotors, some brake lines). I have an intermittent problem where after a period of driving the jeep (seems random....maybe 30-45 minutes), I suddenly get a high stiff brake pedal. The pressure builds and usually one of the front brakes start to apply on his own. It's basically like driving with a frozen caliper so I am forced to pull over.

If I wait for a period of 30-40 minutes for the vehicle to completely cool down, the problem completely goes away and the brakes work perfectly again. This issue seems to happen when the vehicle gets warm...not necessarily the brake system gets warm. This happened the other day when I was driving on the beach for 40 minutes. During that period of time I probably didn't use the brakes at all (the sand stops the vehicle) and this issue happened.

Any thoughts? Proportional value? Master Cylinder? I am at a loss and really don't want to start replacing parts of the brake system without some intelligence first. Since it is intermittent, it is tough to even duplicate and have a professional look at.

Thank you.

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Unread 11-19-2013, 05:22 PM   #2
jokerchief462
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1989 YJ Wrangler 
 
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Caliper hanging up heating rotor rotor expands brakes hang up more and more.

Calipers are cheap get a new pair. Scuff the old pads with some sand paper.

First look at the area on the knuckle where the brake pads slide. Look for burrs on the metal or excessive wear. If you find anything file it out smooth. Lightly grease and re assemble.

Unless you had the brake booster out it could be the adjustment on the bullet that contacts the piston in the Master Cylinder.

All I got

Sent from underneath my Jeep
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Unread 11-19-2013, 08:39 PM   #3
laybackman
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1995 YJ Wrangler 
 
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Next time the brakes hang up take a look at the color of all your rotors. If anyone of them has bluish/purplish/redish sheen to them and is really hot the caliper is junk.

One poaible reason:
When a pads get thin the caliper piston is mostly out. It has a phonelic resin coating. When you shove them back in that coating delaminates from the metal portion of the piston and jams the caliper out. Each time you hit the brakes it tightens the caliper up against the brake pads/rotor.
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Unread 11-20-2013, 04:00 AM   #4
Fisher11
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1995 YJ Wrangler 
 
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Thanks guys, I thought it was a sticking caliper originally and replaced both of them. The pads and rotors are also very new. The fact that the brake pedal is high and extremely stiff doesn't seem like a stuck caliper. I have been doing quite a bit of searching and reading and I saw something about the piston in the Master Cylinder not being able to fully return and causing pressure to build up. This sounds like a possible cause though my M/C is also very new.

I may have to just try to swap some parts...the hard part is that it is an intermittent problem so it is tough to tell if you fixed it! Any help thoughts/comments would be appreciated.
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Unread 11-20-2013, 05:43 AM   #5
laybackman
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Next thought is the brake booster or a vacuum problem with the bb.
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