How do you do a static brake test 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.
What is a static brake test?
A static brake check tests features which the moving/rolling brake check doesn’t. 1. Before you start the engine: Make sure the hand/parking brake is on. Pump the footbrake pedal a few times until it becomes firm (this removes the vacuum in the brake servo unit) and maintain the footbrake pressure.
How do air brakes work on a school bus?
Air brakes work using compressed air instead of hydraulic fluid. Air brakes can be either drum brakes or disc brakes, or a combination of both. Air is pressurized by an engine-mounted compressor. The air compressor then pumps the air into the air storage tanks, which store the compressed air until it’s needed.
What is the minimum time for a static leak test?
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 No product should be delivered to the tank or withdrawn from the tank during the test, which generally takes from two to five hours.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 difference between static leakage test and applied leakage test?
the applied test checks for air leaks in the lines while the static test checks for airl leaks in the tanks.
How do you do a DOT brake test?
Test Service Brakes Wait for normal air pressure, release the parking brake and trailer air supply button(for combination vehicles), move the vehicle forward slowly (about 5 mph), and apply the brakes firmly using the brake pedal. Note any vehicle “pulling” to one side, unusual feel, or delayed stopping action.
Which of the following are you testing when you do the air brake test?
The Air Brake Test covers the different braking systems and tests you on your knowledge of parking brakes, service brakes, emergency brakes, reading low pressure warnings, checking pressure gauges, and more.
How do I test the brakes on my bus?
TEST 1:Parking brake test. 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. TEST 2:Applied pressure test. (With parking brake released.) Turn the bus off.
Air Brakes are standard equipment on many school buses. Generally, air brakes are used on heavy duty vehicles. Air brakes work by the compression of air. Compressed air activates the brakes and causes the bustoo stop.
What should the air pressure be on a bus brake?
When the system falls below approximately 60 psi, the brakes are automatically locked by springs and the bus becomes immobile. TEST 1: Parking brake test. 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.
How do you do a hydraulic test on a bus?
We show the second part of the hydraulic test by moving the vehicle slowly forward and applying the brakes firmly. You should be moving approximately 5 MPH. During this test, make sure the bus doesn’t pull from side to side or display any unusual characteristics such as a delayed stopping action.