TM   9-2320-363-10 1-12. EQUIPMENT   DATA   (Con't). Table  1-1.  Equipment  Data  (Con't). Model M917A1/ M917A1 Data M915A2 M916A1 M916A2 w/MCS Rear  Axle  (Tan- dem): Manufacturer Rockwell Rockwell Rockwell Rockwell RT40-145P RT52-160P RT52-160P RT52-160   w/ CTIS Rated  Capacity 40,000  lb 52,000  lb 52,000  lb 52,000  lb (18,160  kg) (23,608  kg) (23,608  kg) (23,608  kg) Ratio 4.56:1 4.89:1 4.89:1 4.89:1 Automatic   Locking forward-  rear both  rear both  rear both  rear Positive   Traction differential differentials differentials differentials Differential only Brake   System: Actuation Air-mechani-   Air-mechani-   Air-mechani-   Air-mechani- cal cal cal cal Pressure   Range 60-120  psi 60-120  psi 60-120  psi 60-120  psi (414-827 (414-827 (414-827 (414-827 kPa) kPa) kPa) kPa) Airbrake   Chambers: Service 2 on front 2 on front 2 on front 2 on front axle axle axle axle Failsafe  (Spring) 4  on  forward- 4 on forward- 4 on forward- 4 on for- rear   and rear   and rear   and ward-  rear rear-  rear rear-  rear rear-  rear and  rear- axles axles axles rear  axles ABS   (Anti-Lock Brake  System)  : Type 4-channel 4-channel 4-channel 4-channel Location front  axle  and front  axle  and front axle and front  axle  and rear-rear  axle rear-rear   axle rear-rear   axle rear-rear  axle 1-20