I have noticed in Jeep's such as the Grand Cherokee,Liberty,Wrangler etc. have really weak parking brakes.My dad had a wrangler and the parking brake was really weak and you had to pull it all the way up to get it to catch at all on LEVEL ground. Every Grand Cherokee i have been in is the same way(my aunts and friends).
I have driven several Wranglers and Cherokees and I never really notice a issue with the parking brake. I will admit that my 99 wrangler did have to have the cable tightened after I bought it but that was a simple fix. And that was 4 years ago and it still isn't loose yet. Maybe that was just the problem. I'm not saying that jeeps are perfect but I honestly had more problems out of the chevy's I have driven as far a the emergency brake. Maybe just bad luck.
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