Show:
psi
braking
what is
Air tanks
Misc
100

Low air warning activates at what psi 

60

100

Hot brakes

Fade and lose effectiveness 

100
  1. Dual system?

Two different systems 

100

How often drain tanks?

Daily

100

What causes brake fade?

Overheating 

200

At what psi does the saftey valve open 

150 psi 

200

Parking braking 

Controlled by spring pressure 

200
  1. S-cam?
  1. Pushes brake shoes against drum.
200

Why drain air tanks?

Remove water and oil

200

Slack adjusters should not move more than?

1 inch 

300

Max air loss ( engine off , brakes released) 

2 PSI in one minute 

300
  1. What is brake lag?
  1. Delay between pressing pedal and brakes working.
300
  1. Supply tanks?
  1. Store compressed air.
300
  1. What happens if you don't drain air tanks?
  1. Water can freeze and cause brake failure.
300

Why not ride brakes downhill?

Cause overheating 

400

Max air loss( engine off brakes applied

3 psi in one minute 

400
  1. Controlled braking?
  1. Brake hard without locking wheels.
400
  1. What is a "wig wag"? 
  1. low air pressure warning device.
400
  1. Supply tanks?

Store compressed air

400

When do spring brakes activate?

When air pressure is low

500

Cut in pressure 

100 psi 

500
  1. Stab braking?
  1. Apply, release when locked, repeat.
500
  1. Governor?
  1. Controls compressor cut-in/out.
500

Why do air brakes take longer than hydraulic brakes?

Brake lag

500

What happens if pressure drops too low?

Spring brakes engage