Next 8 steps

Question 1

Next 8 steps

Answer 1

2 rebuilds/6 brake checks

Question 2

Rebuild air

Answer 2

Rebuild air pressure to the governor cutoff of 120/140 psi

Question 3

Brake Checks

Answer 3

3 Brake checks with Engine On

Question 4

Tractor Brake

Answer 4

Test tractor by placing vehicle in gear. Release (push in) trailer brake (red) and tug slightly against tractor

Question 5

Trailer Brake

Answer 5

Test trailer brake by placing vehicle in gear, release (push in) tractor brake yellow, and tug slightly against trailer

Question 6

Service Brake

Answer 6

Test service brake by releasing (pushing in) both the tractor and trailer brakes (valves), move forward at 5mph.
Vehicle should stop and not pull to either side.

Question 7

Rebuild air

Answer 7

Place vehicle back in neutral, engage (pull out) both valves (red and yellow) before rebuilding air pressure to the governor cutoff of 120 to 140 psi

Question 8

Brake Checks

Answer 8

3 Brake Checks with Engine Off

Question 9

Air Leak test

Answer 9

Place vehicle in first gear, turn engine off and immediately turn key back on (to ACC/ON), release (push in) both tractor and trailer brakes
(red and yellow valves), ask examiner to time you for 1 minute.
Depress brake pedal until examiner says “TIME”.
You shouldn’t lose more than 4 pounds of air pressure (4 psi) within 1 minute.

Question 10

Low air test

Answer 10

Depress brake pedal rapidly, the warning light or buzzer should come on BEFORE air pressure drops BELOW 55 psi

Question 11

Pop out valve test

Answer 11

Continue depressing the brake pedal rapidly, both valves should pop out when the air pressure reaches approximately 40 psi.
DO NOT ASSIST VALVES IN POPPING OUT and WATCH CLOSELY AS THEY MAY POP OUT SILENTLY

Question 12

Final Step

Answer 12

Make sure vehicle is in neutral.
Brakes engaged and engine off.
Then say “This concludes my in-cab inspection”.