I've got an 02 Z06 and im having problems with the AH/TC/ABS. dash says to service active handling system and service traction system. the car has been to the dealership and many other shops for this problem with no resolution yet.

Background on the car: Its a heads/cam/blower car with only 6,400 miles on it. The car has the Red Devil Brake kit on it. 6 piston calipers in the front and 4 piston in the back. I bought the car with this problem, car has not been on the road in 3 years and owner make it known problem existed before it went away. when i bought the car it had no battery for who knows how long and the ABS controller had been removed. I re installed it and bled the brakes using a snap-on scanner to cycle the controller. I then did all 4 corners again manually. After I bled them i checked for any codes and came up with the following History codes

C1221 LF wheel speed sensor input signal is at 0
C1222 RF wheel speed sensor input signal is at 0
C1248 IPC Indicated low Brake fluid
C1292 Low Master Cylinder Pressure during Decel

I also had the following Current code pop up shortly after bleeding.
C1247 Brake Pressure Differential switch activated.

I did the electronic bleeding following the scanner instructions and since i bought the car it has only run for about 45 seconds and that was before i tried bleeding the brakes.

So any ideas anyone??

 

Forgot to mention one very important detail about the car that i just thought of, that could cause the problem. The car has 19in rims on all 4 corners. what should my tire sizes be on the front and back with that size rim?

 

Fronts are 275/30/19 and the rears are 345/30/19

 

The wheel speed sensors showing 0 voltage is a problem that needs to be sorted out.

 

Those sizes are fine. That is ~1.5" taller in the rear than the front.

 

I'll have to revive this thread in a couple weeks. The car is currently not driveable becasue I am waiting on a new Supercharger tensioner to come from Vortech. Thanks for the help so far though!