Air Brakes

Question 1

what does a Engine Driven Compressor do?

Answer 1

Generates a constant supply of pressurized air to the storage tanks in order to operate the braking system and also the vehicle ancillary services

Question 2

what are the 2 ways an Engine Driven Compressor are cooled?

Answer 2

Air Cooled - recognized by fins

Water Cooled - recognized by the cylinder head.

Question 3

what is the capacity of the reservoir dependant on?

Answer 3

Air delivery rate of compressor
Size/Number of wheel brake actuating chambers
Frequency of brake applications
further demands of ancillary services.

Question 4

what is the purpose of a reservoir?

Answer 4

provide storage capacity of compressed air at the required pressure for immediate effective breaking
also to maintain pressure supply after engine has stopped

Question 5

why are reservoirs rounded?

Answer 5

To allow an even spread of pressure and no pressure points.

Question 6

what are the 2 variations of drain valve?

Answer 6

Manual and Automatic.

Question 7

what is the purpose of a foot control valve.

Answer 7

to provide a means of applying the brakes.

it provides a gradual supply of air during application and allows the exhausting of the air on release of the brakes

Question 8

what 3 positions can the foot control valve be held in?

Answer 8

Brakes applied
Brakes held on
Brakes released