94 Jeep Grand Cherokee brakes won't release?

Question

Have a 94 Jeep grand Cherokee, 2WD, disc front, drums rear, straight 6. The L side front brakes began sticking and not releasing about a month ago. The pedal seemed to build pressure on it's own until it was rock hard and the brakes were completely locked. I could release the pressure from the bleed valve, and it would work fine for a bit, then start again. I replaced the calipers, rotors and pads on both sides. worked fine for a day, started again.

Replaced the master cylinder, bled the system, worked fine for a day, started again, this time, it's the R side.

Vehicle has ABS.....possible that the ABS module is gone out?

Any ideas on what to try? This is beginning to irritate me......

Nomadd · Accepted Answer

The ABS can't apply the brakes. It only pulses the fluid pressure when you use the brakes and a wheel slips.
 It could be a bad vacuum advance unit, or it could be as simple as the pedal not coming all the way up, so the pressure never gets released.

Chief78 · Answer

If brake fluid is squirting out when you open the bleeder screw then it sounds like the line has collapsed.
Try releasing the pressure, pinching the line and taking it for a short test drive. That should tell you for sure.

I meant hose, not the hard lines.
Try loosening the master cylinder and see if that releases your pressure. It could be the push rod length. But I don't think so.
You could also start loosening the fittings starting at the caliper and going to the next one up the system until you don't see the pressure release. Then you will know where the restriction is. That's what sounds like has happened. The ABS unit can get expensive so I would check everything else first.
Did you also say you replaced the hose on the right side?

? · Answer

Jeep Grand Cherokee Brakes

lar45 · Answer

I would definitely go with the ABS next.

94 Jeep Grand Cherokee brakes won't release?

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