I have an 88 GTA with the J65 four wheel disk option. I've always had a really soft brake petal and anyone I talked to attributed this to worn pads, fault rear calipers, etc. Fast forward a few months. The front calipers are two months old, the rear calipers are two days old, all the rotors are new, all the pads are new, the parking break cables (if they really matter) are new, the brake booster is new, and the system has had the **** bled out of it.

I still have the same pedal I started with. I have to push the petal down a good 2-3 inches before I get any noticeable breaking response.

When I had the car up on jack stands after doing the breaks and after mounting the tires, I started the car and put it in drive. The rear brakes couldn't stop the rear tires from spinning at idle with either the brake petal to the floor or the parking break fully engaged. The parking brake its self is useless.

The other weird thing is that when you hit the petal, the carries for the parking break (the thing that pivots on the caliper to engage/disengage the parking break) move out from the caliper, away from the disk. Wouldn't this motion rob fluid from the piston? This is the only thing I can think of that would explain the excessive pedal travel and the lack of breaking.