So I've had an issue with my parking brake idiot light for the past 2 months now. At first the light would only dim after I released my parking brake, but now the light glows its bright angry red face at me even after releasing it.
I used to have an issue with my cylinder in my left rear wheel, it was pissing brake fluid, and I got that replaced, I even replaced the right rear one to be safe. From time to time a small leak will spring and the parking brake light will pop up when my fluid level is low. I've been keeping an eye on my fluid levels and they have not dropped in 2 months.
I have a feeling that the parking brake may be sticking because the other day I was parked on a slope so I left it in first gear without setting the parking brake, when I put it in neutral the thing did not roll backwards like it always does when I park there.
Even my command start is hooked up to the parking brake to shut off when the brake is released, but right now you can release the brake and the engine will continue to run (up until a week ago releasing the brake would kill the engine).
I stopped at a local auto parts store and told them my sob story since I was told it could be my brake proportioning valve. They told me that it could be my switch at the parking brake.
MY 1991 YJ had a similar issue. The parking brake light would stay on. It wasn't the braking system causing it, it was a rusty switch. I used a wire brush and some cleaner on it and the brake light went out. It came back after a few months due to getting stuck because it was so badly rusted.
I finally solved the entire issue when I ran my VIN through Chrysler. It seems they had a recall on the parking brakes. I called the local Jeep dealership, he ran my VIN to confirm, and set an appointment for them to replace my E-Brake free of charge. He even had the part in stock. Got a brand new E-Brake and switch installed. Problem Solved.
The parking brake recall was initially because the bracket that holds the pedal was weak and would bend. Still worth having someone check it out to see if it was done.
On the light side, there are a couple springs that return the brake pedal to the disengaged state. Give them a shot of silicone or teflon spray while you're down there this weekend. My e-brake wouldn't stay engaged, giving the assembly a quick lube job did the trick for me.
1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ
Been having issues with my parking brake light not coming on as well. Shredded two sets of pads because of it. Couldn't remember to check the parking brake on start-up because I didn't have the light to remind me it was on. Read this thread, called Chrysler and sure enough I will be getting a new assembly because of this recall. Hope this gets the light to come on so I can stop doing at least one stupid thing.