DMV CDL TEST QUESTIONS AND
ANSWERS ALREADY PASSED
You should know that brakes are fading when: ✔✔You have to push harder on the brake pedal to control your speed on a down grade.
The brake system that applies the use of the brakes when the driver uses the brake is the: ✔✔Service brake system.
The air compressor governor controls: ✔✔When air is pumped into the air tanks.
If your truck's air compressor has its own oil supply. When should you first check its oil level?✔✔Before driving.
For air brake systems in good conditions the air compressor should start pumping at about: ✔✔100 psi
If your vehicle has an alcohol evaporator, it is there to: ✔✔Reduce the risk of ice in air brake valves in cold weather. 1 / 3
Some air brake systems have an alcohol evaporator. What will happen if you don't keep the unit filled with alcohol? ✔✔Ice will form in the storage tanks and cause the brakes to fail.
The safety valve is set automatically to reduce pressure at: ✔✔150 psi
The brake pedal in an air brake system: ✔✔Controls the air pressure applied to put on the brakes.
Repeatedly presssing and releasing (fanning) the brake pedal may result in: ✔✔The loss of air pressure.
The most common type of foundation brake found on heavy vehicle is the: ✔✔S-cam drum.
S-cam: ✔✔Forces the brakes shoes against the inside of the brake drum.
When the brakes are applied the brake shoes or linings are pressed against the: ✔✔Brake drums or disc.
- / 3
All air brake equipped vehicles have: ✔✔A supply pressure gauge.
The application pressure gauge shows how much air pressure you: ✔✔Are applying to the brakes.
Stop light switch: ✔✔Turns on the brake lights to warn drivers behind you.
Under normal conditions in order to engage the parking brakes the driver must first: ✔✔Make sure the air brake system is fully pressurized.
The braking power of the spring brakes: ✔✔Depends on the service brakes being in adjustment.
The parking or emergency brake on trucks and buses can only be held by: ✔✔Spring pressure
If the spring brakes are on you should push the brake pedal: ✔✔Never
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to: ✔✔Release the spring emergency/parking brakes to move a short distance.
- / 3