One problem related to brake drum wheel cylinder has 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.