CDL Vehicle Inspection

CDL Vehicle Inspection

CDL Vehicle Inspection Memory Aid

Brake Test Practice Checklist-Truck

Step One - Parking Brake Test

Straight Truck and Buses:

• With parking brake engaged: Check parking brake holds vehicle by gently trying to pull forward with parking brake on.

Combination Vehicles:

• With parking brake ON & trailer brake (TPV) OFF: check parking brake holds vehicle by gently trying to pull forward.
• With trailer brake (TPV) ON & parking brake OFF: check trailer brake holds vehicle by gently trying to pull forward.

Step Two - Service Brake Test

All Vehicles:

Release parking brake(s); pull forward at 5 mph, apply service brake. Check brakes work properly & vehicle does not pull to side.

Step Three - Hydraulic Brake Test

(if vehicle so equipped, if not go to Air Brakes Step 3)

• Pump brake pedal 3 times; hold down for 5 seconds. Brake pedal should not move.
• If equipped with hydraulic brake reserve, with the key off, depress brake pedal; listen for sound of reserve system electric motor.

Step Three - Air Brake Test (3 Parts)

Note: wheels should be chocked if on incline

Part 1 Air Leak Check:

• Run engine; build air pressure to 100 to 125 psi (operational level).
• Shut ENGINE OFF/ turn IGNITION KEY ON
• Release TPV & Parking brakes (push knobs in)
• Apply foot brake/ hold for one (1) minute.
• Check air gauge; cannot drop more than: Single Vehicle: 3 pounds in 1 minute. Combination Vehicle: 4 pounds in 1 minute.

Part 2 Low Air Alarm Check:

• ENGINE = OFF IGNITION KEY = ON
• Air pressure still in operational range
• Describe what you are doing and what the expected results will be:
• Pump brake pedal to reduce air pressure:
• Low Air Warning Alarm should come on before air pressure drops below 60 psi +/-

Part 3 Tractor Protection Valve / Spring Brake Check:

• Continue to fan off the air pressure:
• TPV & Parking Brake Valve should close (pop out) when pressure drops between 20 - 45 psi.
• On some combination and single vehicle types, parking brake valve should close (pop out).

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