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3 Cards in this Set
- Front
- Back
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Parking Brake Check |
▶With the parking brake engaged (trailer brakes released on combination vehicles), check that the parking brake will hold vehicle by gently trying to pull forward with parking brake on.
▶With the parking brake released and the trailer parking brake engaged (combination vehicles only), check that the trailer parking brake will hold vehicle by gently trying to pull forward with the trailer parking brake on. |
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Hydraulic Brake Check |
▶Pump the brake pedal three times, then hold it down for five seconds. The brake pedal should not move (depress) during the five seconds.
▶If equipped with a hydraulic brake reserve (back-up) system, with the key off, depress the brake pedal and listen for the sound of the reserve system electric motor.
▶Check that the warning buzzer or light is off. |
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Air Brake Check |
▶With the air pressure built up to governor cut off (120-140 psi), shut off the engine, chock your wheels if necessary, release the Parking Brake, and the Tractor Protection Valve and fully apply the foot brake. Hold the foot brake for one minute. Check the air gauge to see if the air pressure drops more than (3 psi for single vehicle in one minute or) 4 psi for combination vehicles in one minute.
▶Without restarting the engine, turn electrical power on or battery charge position. Begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer or light) should activate before air pressure drops below 60 psi or level specified by the manufacturer.
▶Continue to fan off the air pressure. At approximately 40 psi on a tractor-trailer combination vehicle (or level specified by the manufacturer), the Tractor Protection Valve and Parking Brake Valve should pop out (close). On other combination vehicle types and single vehicle types, the Parking Brake Valve should pop out.
NOTE: Failure to perform all three components of the air brake check correctly will result in an automatic failure of the vehicle inspection test. Air brake safety devices vary. However, this procedure is designed to see that any safety device operates correctly as air pressure drops from normal to a low air condition. For safety purposes, in areas where an incline is present, you will use wheel chocks during the air brake check. The proper procedures for inspecting the air brake system. |
