how to fix and repair frozen brakes?

Question

I have a 1991 Subaru Legacy LS and the front left brake is frozen, we've replaced the calipers and the brake hose and it still freezes until the bleeder is released. as soon as we push the brakes again, the caliper locks up and won't release. The ABS has been disconnected due to malfunctioning

Answer 1

You have a faulty master cilinder.

Possibly master cylinder release valve is not working.

When you press on the brake, the fluid pressurizes.
When you release the brake pedal the brake fluid is suppose to be released back into the master cylinder.

Have someone press the brake pedal down and release it.
As soon as they take their foot off the pedal, crack the bleeder at the brake cylinder. (It should not be pressurized)
If it is, try the same thing at the MASTER cylinder.
If, there is pressure there also, after releasing the brake, then you have a bad master cylinder.

If there is no pressure, then you may have a plugged brake line, or faulty proportioning valve.

Answer 2

I would check with Subaru as the disconnection of the abs may be componding the problem. Id check the caliper sliders to make sure one isnt stuck causing the caliper to bind.

Answer 3

i own a repair shop,and its the abs pump causing them to stick like this,,if you,ll hook the abs system back up,they wont freeze on you,,what its doing is not releasing the pressure when the pedal is mashed,,the only other thing that will cause this is a bad master cylinder,but the fluid still has to pass through the abs system,and that will lock them up,,good luck,i hope this help,s.,PS you might want to get a good used abs pump ,and have it put on it,this may end all of your problems with it,,good luck.