Page 89 - Georgia Commercial Drivers Manual 2020
P. 89
11SECTION : PRE-TRIP INSPECTION TEST
»» Turn signals. • If equipped with a hydraulic brake reserve the foot brake and hold it for one minute.
»» Four-way flashers. (back-up) system, with the key off, depress Check the air gauge to see if the air pres-
»» Brake lights. the brake pedal and listen for the sound of sure drops more than three pounds in one
»» Red reflectors (on rear) and amber reflec- the reserve system electric motor. minute (single vehicle) or four pounds in
one minute (combination vehicle). Special
tors (elsewhere). • Check that the warning buzzer or light is off. note: if the air gauge does not work unless
»» Reflector tape condition Hydraulic Brake Master Cylinder- electrical power is supplied to it, then you
NOTE: Checks of brake, turn signal and four- • Check master cylinder is securely attached will need to turn the electrical power switch
way flasher functions must be done separately. to the on positions on this step.
Horn and not leaking. »» Without restarting the engine, turn electri-
• Check that air horn and/or electric horn • Checks brake fluid level in reservoir to ensure cal power to the on or “battery charge” posi-
work. tion and begin fanning off the air pressure
Heater/Defroster it is between the add and full marks. by rapidly applying and releasing the foot
• Test that the heater and defroster work. Air Brake Check (Air Brake Equipped Ve- brake. Low air warning devices (buzzer,
Parking Brake Check hicles Only) light, flag) should activate before air pres-
• With the parking brake engaged (trailer • Failure to perform all three components of sure drops below 55 psi or level specified
brakes released on combination vehicles), by the manufacturer.
check that the parking brake will hold ve- the air brake check in the correct order will »» Continue to fan off the air pressure. At
hicle by gently trying to pull forward with result in an automatic failure of the pre-trip approximately 40 psi on a tractor-trailer
parking brake on. inspection test and you will not be allowed combination vehicle (or level specified by
• With the parking brake released and the to proceed to Basic Skills and/or the Road the manufacturer), the tractor protection
trailer parking brake engaged (combination test. Air brake safety devices vary. However, valve and parking brake valve should close
vehicles only), check that the trailer parking this procedure is designed to see that any (pop out). On other combination vehicle
brake will hold vehicle by gently trying to pull safety device operates correctly as air pres- types and single vehicle types, the parking
forward with the trailer parking brake on. sure drops from normal to a low air condi- brake valve should close (pop out).
Hydraulic Brake Check tion. For safety purposes, you will use Service Brake Check
Failure to complete the hydraulic brake check wheel chocks during the air brake check. You will be required to check the application of
correctly will result in an automatic failure of The proper procedures for inspecting the air air or hydraulic service brakes. This procedure
the pre-trip inspection test and you will not brake system are as follows: is designed to determine that the brakes are
be allow to proceed to Basic Skills and/or the »» With the air pressure built up to governor working correctly and that the vehicle does not
Road test. pull to one side or the other.
• Pump the brake pedal three times, then hold it cutoff (120 - 140 psi), shut off the engine,
down for five seconds. The brake pedal should chock your wheels, release the parking Get Your CDL In 3 - 4 Weeks
not move (depress) during the five seconds. brake (all vehicles) and the tractor protec-
tion valve (combination vehicle), fully apply
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