Reading Flashcards

Reading the pre-trip inspection procedure, what should the air pressure build-up rate be in a dual-system vehicle?

Answer: From 85 to 100 psi within 45 seconds

In a dual system, pressure should build from about 85 to 100 psi within 45 seconds at operating rpm.

During the static leakage test, what is the maximum allowable air loss for a single vehicle in one minute with brakes released?

Answer: 2 psi

With the engine off and brakes released, a single vehicle should not lose more than 2 psi in one minute.

When testing with brakes applied, what is the maximum air loss allowed for a single vehicle in one minute?

Answer: 3 psi

With brakes applied, a single vehicle should not lose more than 3 psi in one minute.

According to the inspection steps, at what pressure should the spring (parking) brakes activate automatically when air is pumped down?

Answer: Between 20 and 45 psi

The spring brakes should come on automatically somewhere between 20 and 45 psi.

Reading the procedure to test the parking brake, what should you do?

Answer: Apply parking brake, gently pull against it in low gear

Test the parking brake by setting it, releasing the service brake, and gently trying to move forward in low gear.

The service brake test calls for moving at about 5 mph and pressing the brake. What indicates a problem?

Answer: The vehicle pulls to one side or has delayed stopping

Pulling to one side, unusual feel, or delayed stopping during the service brake test signals a problem.

Per the inspection guide, what must you check on the slack adjusters of S-cam brakes?

Answer: That they move no more than about one inch when pulled by hand

Manual slack adjusters should not move more than about one inch where the push rod attaches when pulled by hand.