Air brakes

During normal driving, spirng brakes are usally held back by

• bolts

• air pressure

• spring pressure

The brake pedal in an air brake system

• controls the speed of the air compressor

• controls the air pressure applied to put on the brakes

• is connected to slack adjusters by a series of rods and linkages

the brake system that applies and releases the brakes when the drives uses the brake pedal is what system

• emergency system

• service system

• parking system

all air braked equipped vehicle must have what

• a supply pressure gauge

• an application gauge

• a backup hydraulic system

if your truck or bus has a dual parking control valve you can use pressure from another tank to

• release the spring brakes to move the vehicle in an emergency

• apply more pressure if the tank is getting low

• balance the service brake system whenever you are parked

the most common type of foundation brake found on heavy vehicle is the

• wedge brake

• s-cam drum brake

• disc brake

Parking or emergency brakes of trucks and buses can be legally held on by what

• spring pressure

• fluid pressure

• air pressure

if your vehicle has an alcohol evaporator, it is there to :

• rid the wet tank of alcohol that collects and sits at the bottom

• eliminates the need for daily tank draining

• resuce the risk of ice in valves and other parts in cold weather

some air brake systems have alcohol evaporator. what might happen if you don't keep the unit filled with alcohol

• the s-cam may not rotate back when you release the pedal

• ice may form in the tank and cause the brakes to fail

• ice may form on the drums and warp them

the most important thing to do when the low air pressure warning comes on is

• downshift

• turn the warning off

• stop and park safely as soon as possible