It's a very simple system, but it does need to be adjusted properly & have all the parts there.
First thing is to crawl under the middle of your jeep (driver's side) & look for 2 cables coming from your rear end & joining to one cable coming from the front, connected at a small adjustment plate. Assuming that the actual parts are in each rear brake, you will see a threaded portion at that plate that can be screwed in or out.
I find mine works best when tightened to the point that there is about 1.5 inches of pedal movement before they start to engage.
If it has new breaks then im guessing either the lines arent hooked up, or have fallen out of adjustment to the point of them not working..
you might also look into seeing if your jeep ever had the brake pedal recall performed.. since its a recall you can schedule it with any jeep dealership and they will replace the faulty e-brake pedal for free, and since they're replacing the pedal they wont be able to test it without the brake working correctly, so they'll have to fix that too
Had the same problem on our 94 YJ last year-the e BRAKE didn't hold at all. The 'adjustment' is a threaded rod/nut assembly where the two cables from the rear axle join to the one coming from the pedal. E brake is ONLY for rear brakes. We replaced the adjustment plate after snapping off the nut on the first one. So...spray that bolt and nut like crazy with PB Blaster (WD 40 is not a rust remover) before you attempt to turn it. What our problem really ended up to be was the 'actuator' inside the brake drum that the cables hooked into-those were frozen up. I can't remember if the shop we had it worked on replaced them or were able to 'unstick' them and reuse them but it wasn't that expensive. You need to take off a rear tire and brake drum, and have someone push the pedal down while you watch and see if that actuator is working or not.
you can either request in person at a dealership or request a build sheet online, once they email you back with your jeeps build sheet, it will explain at the bottom what recalls havent been performed yet. i'm looking for a link now
I found it: Build Years/Makes/Models: 1990 - 1995 Jeep Wranglers Units affected: 316148 Recall Number: 02V041000 Summery: On certain sport utility vehicles equipped with manual transmissions, the parking brake can self-release without warning. Consequence: This could allow the vehicle to roll away, increasing the risk of a crash.
Remedy: Dealers will install a parking brake assembly with a stranger pawl return spring. Owner notification began September 30, 2002. Owners who take theit vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact DaimlerChrysler at 1-800-853-1403. Notes: DaimlerChrysler Recall No. B03 Also contact the National Highway Traffic Safety Admin. Auto safety hotline at 1-888-Dash2-dot (1-888-327-4236) Build Years/Makes/Models: 1990 - 1995 JEEP WRANGLER UNits affected: 316148 Recall Number: 02V041000 Summary: ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH MANUAL TRANSMISSIONS, THE PARKING BRAKE CAN SELF-RELEASE WITHOUT WARNING. Consequence: THIS COULD ALLOW THE VEHICLE TO ROLL AWAY, INCREASING THE RISK OF A CRASH. Remedy: DEALERS WILL INSTALL A PARKING BRAKE ASSEMBLY WITH A STRONGER PAWL RETURN SPRING. OWNER NOTIFICATON BEGAN SEPTEMBER 30, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT DAIMLERCHRYSLER AT 1-800-853-1403. Notes: DAIMLERCHRYSLER RECALL NO. B03ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).