[polizei]

Hey Guys,

I hung around while a shop upgraded my 87 Carrera to 996 C2 Calipers and Rotors on Saturday. I'd prefer not to name names until I find out what's required to fix the issues. Suffice it to say, due to what I experienced at the shop and now with my car, I do not feel comfortable to have this shop touch my car again. I'm kicking myself for not doing proper due diligence and will work with another shop to correct the issues - even if that means more $$. Once I understand the extent of the fallout, I will post another thread to convey my experience regarding this shop, so that others considering similar upgrades can make informed decisions.

Please keep in mind that I'm a novice. I hired a professional shop for the knowledge and skilled labor that I do not have. As these issues unfolded, it seemed off to me, but I naively trusted the judgment of the professional I hired.

1. The shop owner rebuilt the calipers. He put the very first piston in backwards. Realizing his mistake, he used compressed air to pop it back out. He ended up chipping the back of the piston when it slammed against the opposing side of the caliper, creating jagged edges. He decided to file down these edges and move forward. It didn't seem that there was any material that would have damaged the piston bore, but it's certainly possible. Should the piston be replaced? Does this make the whole caliper a big paper weight?

2. I'm not sure what the correct process is for replacing a brake master cylinder, but it seems to me that corrosive brake fluid should be drained prior to replacement. Perhaps I'm wrong. Regardless, the owner did not opt to drain. He dripped brake fluid all around the master cylinder and brake booster area during replacement. I kept sopping it up with shop towels as best I could. Any concerns here? Should the effected surface be treated? Or is sopping it up good enough?

3. After mounting all of the calipers and rotors, the owner began bleeding the brakes, as I manned the brake pedal. He discovered that brake fluid was squirting out of one of the front 36mm pistons due to a new pressure seal being damaged during installation. He decided to fix the problem by replacing the damaged 36 mm seal with a 37mm seal from an SC rebuild kit, as that was the best replacement he had on hand. He remounted the caliper, bled the brakes and no leaks. Any concerns here?

4. On the drive home, I noticed two items that I think may be related. My oil temps were running 25 degrees higher than normal and I began to hear a loud hum coming from the wheels at speed when no brake was applied. Is it possible that the brake pistons are not fully retracting? If so, then the pads may be pushing against the rotors NOT under braking. It seems that this could account for the hum, and, because the engine is working harder to overcome the friction, it may also be causing the oil temps to rise. Any thoughts on this? Is there a process I should be going through to get the new pads and seals to seat properly?

5. Under hard braking, the car consistently lurches to the driver's side. I had my wife try as well to verify that I wasn't causing with lurching with the steering wheel. Same result. Any thoughts on what could be the problem?

As always, thanks for your generous input. Guys like me wouldn't be able to afford a 911 if it weren't for this forum!