51. Emergency stab braking is:
Press on the brake pedal as hard as you can, release the brakes when the wheels locked, put on the brakes again when the wheels start rolling.
52. A slack adjuster’s free play needs to be adjusted if it is more than about ____ how many inches when you pull hard on it?
1 inch
53. If air pressure is not built up within the correct amount of time, then:
Your air pressure may drop to a low point while driving, requiring an emergency stop.
54. The safety valve reduces pressure at ___ psi?
150
55. Why should you drain water from compressed air tanks?
Water can freeze in cold water and cause brake failure.