Inside Cab

Start Engine - I will now start the engine. (Start the engine.) The air pressure is building at an acceptable rate. (Wait for normal pressure - at least 100 psi on dual system. Remove your wheel chock while pressure is building. You have just verified that the spring brakes work.)

Parking brake - I am checking the parking brake by pulling out the knob and trying to move the truck. (Pull the parking brake knob out, put the truck in gear, and try to pull gently against it.) Ok, I can tell that the parking brake is working.

Mirrors - I am checking the mirror adjustment.

That completes the Inside section. Pull out the tractor protection valve and the parking brake. Shut off the truck. Take a couple of minutes to look around inside and outside to see if you have forgotten anything. When you are sure that you covered everything, tell the examiner that you are finished. The test is not over until you tell them that you are finished. Good Luck.
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 Pretrip Test Study Guide


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Lights and indicators check - (Turn on headlights - high beams; and four-way flashers.) I am checking that the indicator lights for the flashers are working and the high beam indicator is on. (On the dash. Then go to front of truck.) I am checking that high beams are on and both four-way flashers are working. (Push dimmer switch.) I am checking that the high beam indicator is now off. (Go back to front.) I am checking that the low beams are on. (Turn off headlights and four-way flashers. Turn on parking lights, clearance lights, and left turn signal. Walk towards rear of truck, cleaning any lights that you can reach as you go.)
Steering Wheel - I am checking the free play on the steering wheel. There should be no more than 10 degrees play , which is 2 inch movement in a 20 inch wheel. Any more would make it hard to steer. (Move steering wheel back and forth till you feel resistance.)

Emergency Equipment - I am checking for the required 3 pieces of emergency equipment; an approved fire extinguisher, 3 reflective triangles, and spare fuses. The fire extinguisher should be at least a 5BC. (Fire extinguisher may be in accessable storage area - must have sign on outside saying "Fire Extinguisher Inside")

Clutch, Shifter, Parking Brake - I am checking the clutch (freeplay should be between 1 1/2 and 2 inches), the gearshift is in neutral, and the parking brake is engaged. (Move clutch to check freeplay and move gearshift to make sure it is in neutral; check parking brake button is pulled out.)

Start the Engine.

Gauges - I am checking the gauges. The voltmeter is reading in the correct range. The oil pressure is rising. Temperature is gradually rising as the engine heats up. Air pressure is increasing.

Windshield - (Yeah, you did it during the engine compartment, but you can see it good from inside. You can't check anything too much.) I am checking the windshield for cracks, to see that it is clean, and that it does not have any stickers which are not allowed. I am checking the windshield wipers for missing, damaged, or broken parts; that the rubber is good and it is flat against the windshield.

Wipers - I am checking the windshield wipers for proper operation.. (Turn them on for a couple of wipes.)

With firm pressure on the brake pedal (approximately 90 psi) the vehicle can now lose 4 psi with the brake on. (Wait a few seconds to see how much pressure gauges drop.) It tests OK.

Warning - Now I will test the warning devices. I am fanning the brake pedal to reduce the air pressure. When the pressure drops below 60 psi, a warning device should come on. (Fan till the indicator comes on.) The indicator has come on. It can be a light, buzzer, or wigwag. When the pressure drops into a range of 10 to 45 psi, the tractor protection valve should close and the spring brakes will come on. (Continue fanning until the tractor protection valve pops out.) The tractor protection valve has closed and the spring brakes have been enabled. (You can hear them engage with your door open.)

Wait for normal air pressure and then shut the engine off. Turn the switch back on so that you have electrical power.

Complete brake test - I waited for full air pressure and will now do a brake test. (Push in tractor protection valve and parking brake.) I am pushing in the tractor protection valve and the parking brake. After the initial drop the vehicle can lose 3 psi without any brake pressure applied. (Wait a few seconds to see how much pressure gauges drop. Then press and hold the brake pedal.)

Heater - I am checking the heater and defroster for proper operation. (Turn fan on. feel for output at heater vents and defroster when you move control to those positions.)

Horn - I am checking the city horn and the country horn. (Tap the horn on the steering wheel, and then lightly pull the cord for the air horn.)

I am checking that all clearance lights, side marker lights and tail lights are working properly. Amber lights are toward the front and red are to the rear. I am checking that the left rear turn signal is on and is the proper color (red). I am checking the license plate lamp for proper operation. (Continue around the truck, pointing, cleaning, and saying that you are checking lights until you get back to the front of the trailer.) I am checking the clearance lights on the tractor and trailer for proper operation. I am checking that the left turn signal is working and is the proper color (amber or white towards front).
(Turn off all lights, turn on right turn signal, apply trailer hand brake or ask a helper - or examiner - to press the brake pedal. Walk to rear of truck.) I am checking that both brake lights are working properly and are the correct color (red) and that the right turn signal is operating properly and is the correct color (red, yellow, or amber). (Continue around truck to front.) I am checking the front right turn signal for proper operation and correct color (amber or white facing forward).