I'm new to this forum. I have a 1996 jeep grand cherokee laredo V8, had to replace the brake booster because when I applied the brakes you can hear air leaking from it. We went to our local auto parts store and installed the new booster. after driving it a few miles the rear brakes locked up, was able to drive it home, after sitting awhile the rear brakes rereleased, removed the brake booster and got it replaced from out local auto parts. after we installed the 2nd new booster, the brake pedal is hard to press and had little to no brakes, then we went to a different auto part store and installed a 3rd new booster and still having the same problem. any help would be appreciate it.

 

best to get advice in the GRAND CHEROKEE section, known as ZJ

this is the plain old Cherokee section, known as XJ

many of the parts are different

 

Make sure the pedal pushrod is the right length.