- 1 How do you test air brakes on a school bus?
- 2 How do you use air brakes on a bus?
- 3 What is the 7 step air brake test?
- 4 Which three tests should you perform on a hydraulic brake system?
- 5 What is the first step of the air brake test?
- 6 What is the minimum time for a static leak test?
- 7 What is the first thing you should do when a low air pressure warning comes on?
- 8 What PSI level is the safety relief valve set to open at?
- 9 When spring brakes are on you should never?
- 10 How many questions can you miss on air brakes?
How do you test air brakes on a school bus?
Start the bus and let the air pressure build to at least 90 psi. Step on the brake pedal and put the bus into gear. Slowly take your foot off the brake and gently press the accelerator. The bus should not move.
How do you use air brakes on a bus?
To apply the air brakes during normal stops, push the brake pedal down. Control the pressure so the vehicle comes to a smooth, safe stop. If you have a manual transmission, do not push the clutch in until the engine RPM is down close to idle. When stopped, select a starting gear.
What is the 7 step air brake test?
The Seven-Step Air Brake check is designed to test the governor cut-in and cut-out pressures, air pressure leakage, warning buzzer, brake valves and air pressure rebuild rates. Brakes off means the yellow and/or red valve is pushed in (on = valve out).
Which three tests should you perform on a hydraulic brake system?
To test hydraulic brakes, you should pump the brake pedal three times, then apply firm pressure to the brake pedal and hold for five seconds. The pedal should not move. If it does, there may be a leak. 23.43 % of our users get this question wrong.
What is the first step of the air brake test?
Before starting the air brake test, park the vehicle on a flat surface, apply spring brakes and wheel chokes. Start testing with the low air warning device.
What is the minimum time for a static leak test?
The leak test may be initiated automatically or manually. The tank must be taken out of service during the leak test if using an ATG system performing static testing at a programmed time. No product should be delivered to the tank or withdrawn from the tank during the test, which generally takes from two to five hours.
What is the first thing you should do when a low air pressure warning comes on?
The first thing to do when a low air pressure warning comes on is: Stop and safely park as soon as possible. The braking power of the spring brakes: Depends on the adjustment of the service brakes.
What PSI level is the safety relief valve set to open at?
A safety relief valve is installed in the first tank the air compressor pumps air to. The safety valve protects the tank and the rest of the system from too much pressure. The valve is usually set to open at 150 psi.
When spring brakes are on you should never?
Never apply the brake pedal if your spring breaks are activated. Brakes can be damaged if they are subject to both springs and air pressure.
How many questions can you miss on air brakes?
On a 20-question test, you can miss four questions. Often the air brake test is added to the general knowledge exam for first-time CDL drivers. While the general information is standardized throughout the United States, each state creates its test and focuses on different information on the written exam.