Question about 2002 Jeep Liberty
A few possibilities exist: Your rear brakes may be binding (rusted pistons)
but usually that will affect one side more than the other. More common reason is that the master cylinder is bypassing or air has gotten into the rear half of the system. (usually the pedal won't feel "right" if either happens. If the pedal feels normal I'd look at the porportioning valve. If that fails, it will not permit pressure to reach the rear brakes.
As for the e-brake, they are really not designed to lock up but depend on vehicle weight and motion to cause them to hold. In the past they were used as a "fail safe" in the brake system. presently they are more used as a "hill hold" to keep pressure off the transmission and shift linkage when the vehicle is parked on a hill.
First make sure nothing in the brake assembly is binding and preventing full engagement, and that there is no air in the system or a master cyl problem, then check the valve.
Posted on Apr 30, 2010
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Posted on Jan 02, 2017
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