Two problems related to brake master cylinder have been reported for the 1998 Jeep Wrangler. The most recently reported issues are listed below.
No rear brakes and the front brakes locked up. The trouble takes place mostly when it snows or when it is slippery. The back brakes have never worked. Dealer changed everything in the brake system, except the master cylinder. Inspector from Jeep came ,. And worked on it. Then, they said the nature of the beast was not to have any rear brakes. Parts that were changed included three sets of brake shoes/two rear brake drums/two sets of rear wheel cylinders, proportional valve/abs computer for brake system, and two brake lines.
When brakes are applied, the front brakes lock up, but the rear wheels continue to turn, which is extremely hazardous during slippery conditions. Dealer has tried to correct problem by replacing drums and valve, but that did not cure the problem. They have now ordered a new master cylinder. We are hoping that the master cylinder cures the problem, but are concerned that other people may not realize that there rear brakes are not functioning properly.