Superformance Brakes (or not)

[wanab5150]

If you have read all the posts regarding the brake issue, you would realize we DO NOT have the same calipers on the rear of our cars thus your car may stop, as it has 4 pot calipers (or PBR calipers) and my car has the new single pot 34mm Wilwood calipers. Dennis Olthoff himself tested these calipers and using a fixed force against the brake pedal with the engine off, (no vacuum) and found them to be MORE THAN 65% less effective in the clamping force on the rotor face than previous versions.
Your car, and the other guys car, either have the older 4 pot Wilwood's with the e-brake not attached at the caliper, or the PBR caliper with the e-brake incorporated in the caliper. It would bug me personally to have bought a Superformance with a set of PBR’s in the rear and Wilwood’s up front. My purchase invoice states my car has 4 pot wildwoods at all 4 corners! But NOOOOOO……it has single pots on the rear. If they worked correctly I would not be so bent!
I received a call from Barry Block (General Mgr. Superformance) today. He acknowledged that there is an issue BUT still says they haven’t figured out whether it’s the vacuum/ vacuum pump issue or the calipers themselves. He said Dennis Olthoff will be receiving several new calipers to try, and will experiment with the vacuum issue with 427R Roush motors. Olthoff already tested Dynalite 4 pot calipers, PBR calipers, Wilwood 41 mm calipers, and Wilwood 34mm calipers…….what’s next?
So….which calipers do you have Wilwood or PBR (finned and look completely different than the front)?
I am convinced that the vacuum issue is a big part of the problem and could be cured with a vacuum reservoir instead of an expensive pump, and do essentially the same thing. I could also BE WRONG!
If Dennis Olthoff wants to replace my rear calipers with a more efficient ones I’m good with that also. After all…Z06 Vette’s only have a single pot in the rear and I could not fault my ’03 Z06. Eight weeks ago Olthoff recognized this problem with the rear caliper and indicated it was the rear caliper back then! I say throw a vacuum canister or vacuum pump on it and see if it works. As it stands now….were not any closer to a solution than we were 8 weeks ago!!! tom

tom

[pooreds]

Great post Tom, I was waiting for that.
Got my car back tonight, hopefully blue smoke issue is solved.
Brake issue is not solved, Stephen tried a vacuum cannister and it made no difference. I've been told to be carefull until there is a solution.
Make sure we hook up on the 19th for the Sonoma trip. ED

[Woodz428]

Originally Posted by wanab5150

. Olthoff already tested Dynalite 4 pot calipers, PBR calipers, Wilwood 41 mm calipers, and Wilwood 34mm calipers…….what’s next?


tom

The fact that those many calipers have been tried and still has poor braking says it all, in my mind. If it was the calipers, any one of them should have corrected it.....or at least made it better. Maybe it isn't vacuum related as I suspect, however I doubt that it it is caliper related. I still can't imagine any vehicle with bad calipers in the back NOT locking the front brakes when they are applied hard, IF all other parts of the system work correctly. Once again it's simple physics..if on end isn't working and you apply more pressure, the end that is working would lock up. You haven't mentioned any time when you locked up the front brakes, that alone is suspect.