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CDL · General

When braking with air brakes during normal driving, what is the recommended technique?

Correct answer

Apply steady, controlled pressure (with modern ABS, do not pump); for non-ABS, brake firmly without locking the wheels

  1. A Pump the brakes rapidly
  2. B Apply steady, controlled pressure (with modern ABS, do not pump); for non-ABS, brake firmly without locking the wheels
  3. C Slam the brakes hard always
  4. D Never use the brakes

Why this is the answer

For NORMAL stops with air brakes, apply STEADY, CONTROLLED pressure. With ABS (Antilock Braking System), do NOT pump the brakes — apply firm, steady pressure and let the ABS prevent lockup. For older non-ABS systems, brake firmly without locking the wheels (controlled braking) or use 'stab braking' in emergencies (apply fully, release when wheels lock, reapply). CDL air brakes. AIR BRAKE LAG: there's a slight delay before air brakes take effect (about 1/2 second), so account for it. Knowing proper braking technique (steady pressure, don't pump with ABS) is commonly tested.
Source: FMCSA CDL Manual — Air Brakes, Braking Technique

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