Home › CDL Practice Tests › Air Brakes Questions › Question 243
Why should stab braking not be used on a vehicle whose ABS is working?
- A.ABS already modulates pressure at each wheel faster and more precisely, and stabbing the pedal interferes with that control
- B.ABS makes the service brakes too weak for emergencies
- C.Stab braking drains the ABS air dryer
- D.Working ABS requires pumping to activate
Correct answer
A. ABS already modulates pressure at each wheel faster and more precisely, and stabbing the pedal interferes with that control
Why
Manual stab cycles remove and restore total system pressure, undoing the per-wheel control the ABS controller is providing. With working ABS, firm steady application and steering is the correct emergency technique.
Manual topic: Air Brakes - Stab Braking · From the Air Brakes practice bank (AB-243).