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Originally Posted by Randy M.
Standard Superformance stuff. Wilwood disc brakes. Parking brake is off and is standard Superformance drive shaft brake (totally useless) that won't even hold the car in my driveway. The brakes are gripping enough now that they are providing more resistance to roll than full application of parking brake.
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Randy, the driveshaft E brake is actually a major upgrade from the earlier E brake system that went to the rear discs - which really didn't work well. I paid $500 for the parts for the driveshaft system upgrade...and can now park even on a grade.
Maybe there's something caught within the caliper. I had a stone get stuck in mine that made a horrible noise occasionally. If you take the split pins off and pry the pads sideways off the disc gently, you can then pull the pads out and then spray Brake-Kleen liberally around the area. The pistons may be getting stuck due to some cylinder corrosion or gum.