Air Brakes Flashcards
3 different braking systems:
Parking
Service
Emergency
The governor controls ____ air is pumped into storage tanks
WHEN
Storage tanks hold enough air to operate brakes several times before compressor quits working . TRUE or FALSE
True
If a leak should occur in the COMPRESSOR there is a ONE-WAY check valve that prevents leaking from the storage tanks
TRUE or FALSE
True
Debris like oil & water are trapped in a Automatic Water Ejector in the 1st tank then pumped into a ____ _____.
Wet tank
Water in the air system can freeze and cause this to happen____ ____.
Brake failure
Alcohol evaporator reduces the risk of ____ building In the air brake system.
Ice
Safety valve is set to open at this psi.
120-125
Brake pedal controls air pressure to the _____brake
Service
Air supply pressure gauge shows how much is available in the_____?____.
Air tank
When using parking or emergency brakes this type of pressure is used.
Spring pressure
Air brake equipped vehicles must have this braking system just in case air system fails.
Hydraulic braking
Application pressure gauge shows driver how much air is being …
Applied the the brakes.
Warning device shows when air pressure is low in the services air brake when the psi falls below_____
60
What can legally hold a parking or emergency brake in position.
Spring brakes
What turns on the electrical stop switch in air brake system
Air pressure
If truck has dual parking control valve. You can use pressure from separate tank to release ________
Release emergency brakes to move a short distance
With dual air brake system. If a low air warning prejudge comes on for the SECONDARY SYSTEM you should
Stop safely park
Continue ONLY when system is repaired
Stop and safely park as soon as the low air pressure warning comes on.
True or False
True
Never disconnect steering axle breaks TRUE or FALSE
True
Stab braking is a technique used during emergency braking. You need to :
- BRAKE HARD UNTIL WHEELS LOCK
2. LET OFF THE BRAKES WHILE WHEELS ARE LOCKED.
Emergency brake is held on by SPRING AIR PRESSURE
True or False
True
How to check the free- play on manual slack adjuster
- Park on level ground, chock wheels
- Release parking brakes
- Pull slack adjuster
•CAN NOT HAVE ANYMORE 1/2”-3/4 “ free play
Air leakage release rate for COMBO engine OFF, brakes released. Air syst. should not loose more than ____ psi per minute :
3
Straight truck ENGINE OFF-BRAKES RELEASED air brake system should not leak more than ____ psi per minute
2
Air of s straight vehicle ENGINE OFF. BRAKES ON!!! Should not leak more than ___ psi per minute.
3
Test parking brake while your
Parked
When you fan your brakes it doesn’t allow for cooling TRUE or FALSE
True
Hydraulic braking takes longer because of flow time TRUE or FALSE
True
______ _______ _____ makes the total stopping distance for air brakes longer than hydraulic brakes.
Brake lag distance
Warning will show when air pressure falls below
60 psi
Safety relief valve opens at ____ psi
150
When some air brake systems are doing more work than others the brakes will develop more heat , fade & vehicle handling will be affected.
TRUE OR false.
True
True if false . Your safety release valve needs immediate attention when relief valve has opens several times.
True
Test compressor on dual air brakes systems by letting pressure build up between ____& ____.
85-100
Spring brakes are held on by ____& ____.
Electrical & hydraulic
Nth is can cause ALL AIR BRAKES to have less power
Out of adjustment
Air brakes use ______air
Compressed
