Air Brake / Numbers

Question 1

How long is a regular tractor trailer?

Answer 1

45 Feet

Question 2

Spring brakes stop air pressure when pressure drops below

Answer 2

20 PSI

Question 3

Safety Valve is set Automatically at

Answer 3

150 PSI

Question 4

After Reaching safe speed

Answer 4

35 MPH

Question 5

Air brake Lag at 55 MPH on dry pavement

Answer 5

32 Feet

Question 6

Bus with air brakes going at 55 MPH the stopping distance is

Answer 6

300 feet

Question 7

Air brake system should not leak at the rate of when engine is off

Answer 7

2 PSI

Question 8

Before pressure in the service tanks its too low

Answer 8

60 PSI

Question 9

Safety valve is automatically set at this number

Answer 9

150 PSI

Question 10

For going down a long a long steep grade after brake ____ the posted speed limit

Answer 10

5 MPH

Question 11

The number of an Air Brake system is fully charged

Answer 11

125 PSI

Question 12

Safety Valve discharge Automatically

Answer 12

150 PSI

Question 13

AIr Compressor stops pumping air at this number

Answer 13

125 PSI

Question 14

Safety valve reduce pressure at

Answer 14

150 PSI

Question 15

Air pressure should build up from 85 ton 100 within time

Answer 15

45s

Question 16

Adjust slack free play if its more then ____ when I pull hard

Answer 16

1 Inch