I haven't posted in a long while. I have a 99Z28 that I had new rotors and pads put on in a local shop (Kuwait). I did a brake test at about 50 mph on dry pavement and all wheels locked up. I took it back and they scanned it and said that code C0050 (right?) rear sensor. I don't have traction control! They also said that I need to order (GM 10456115) which is the correct rear sensor for my vehicle. Do I have a ABS indicator lamp out (it doesn't light all all)? ABS codes should also light the brake indicator which works when I pull on the E-brake. I had the trans rebuilt last year and the mechanic (different one) had my car for a couple weeks when I was in Afghanistan. Could he have messed something up that would cause this? My cruise control hasn't works since the transmission was repaired.
I already ordered the sensor from the states, should I order any other parts?

 

an abs problem will not usually light the red brake light, does the yellow abs light come on when you first turn the car on

 

ABS indicator will not light at all. Code c0050 should light both indicators.
Page 5-150 1999 Service Manual Vol 1 DTC C0050 RR Wheel Speed Circuit Malfunction
Action When the DTC sets
A malfunction DTC stores
the ABS/TCS disables (I don't have TCS)
The amber ABS/TCS indicator(s) turn on
The Red brake warning indicator turns on