section 5 air brakes Flashcards
(43 cards)
what are the three different break systems of air breaks
Service breaks , parking breaks , and emergency breaks
What does the service breaks do
Applies and releases the breaks when you use the break pedal during normal driving
What do the parking breaks do
applies and releases the parking breaks when using the parking breaks control
What do the emergency breaks do
uses parts of the service and parking brake system to stop in a break system failure
what does the air compressor do
pumps air into the air storager tanks (Resovoir)
what does the air compressor governor do
Controls when the air compressor will pump air into the air storager tanks.
what turns the compressor on and off
the key
what are air storage tanks used for
Air storage tanks are used to hold compressed air
What happens when water catches in the compressed air
comrpressed air usually has some water and some oil in it which is bad for air breaks , water can freeze in cold weather and cause break failure
what should you do with air tanks manually at end of shift
you must drain the tank yourself at the end of each shift
What is the purpose of the alchohol evaporator
Puts alchohol into the system to help reduce ice in brake valves
Check achohol container as neccasary during cold weather
safety valve is installed in first tank the air compressor pumps air to
pushing down the brake pedal
pushing the pedal down harder than neccasary
foundation brakes are on every wheel most common being s cam drum brake q
brake fade
too much heat can cause the brakes to stop working
when you push the brake pedak air is let out into each
Do you need a pressure gauge?
all vehicles with air brakes must have a pressure gauge connected to air tank
what does the application pressure gauge do
shows how much air pressure you are applying to brakes
20 -45 psi
when emergency brakes apply
55pi
alarm sounds before pressure falls to dangerously low
100pi
governor cuts in normal pressure
125 pi
governor cuts out full pressure
