CDL Air Brake Endorsement Q&A

It is not safe to drive a vehicle that has brake drums with cracks that are longer than __ of the width of the friction area. - Answer- 1/2 To correct a drive-wheel braking skid, you should: - Answer- Stop braking and steer/counter steer The air compressor stops pumping air at what psi? - Answer- 125 Controlled braking: - Answer- Is used to keep vehicle braking in a straight line It is not safe to drive a vehicle that has brake drums (or discs) with cracks or that are thinner than the manufacturer's specifications, generally this will be_ an inch. - Answer- 1/2 What do air brakes use to make the brakes work? - Answer- Compressed air Excessive use of the service brakes results in overheating which can lead to: - Answer- Expansion of the brake drum The air brake lag distance at 55 mph on dry pavement adds about __ feet. - Answer- 32 Feet Before driving a truck or bus with a dual air brake system, the pressure in each air brake system should be at least__psi. - Answer- 100 The emergency brake system: - Answer- Uses parts of the service and parking brake system to stop the vehicle in the event of a brake system failure The parking or emergency brakes of trucks or buses can legally be held on by __ pressure. - Answer- Spring The stop light switch: - Answer- Turns on the brake lights to warn drivers behind you Th