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1 OAK Engineer - Brakes
Numbers associated with the Brake Test
17
Engineering
Professional
07/28/2010
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Term
At what p.s.i. must the air compressor governor cut out?
 Definition
130lbs
DMV 63
Term
When tank pressure falls below what PSI must the governor allow the compressor to begin pumping again?
 Definition
85 p.s.i.
DMV 63
Term
How many brake systems are there?
 Definition
Three (spring, service, and emergency)
Term
During the Static Leakage Test with a fully charged air system, the engine off, all brakes released, and the system settled what is the maximum drop over the course of one minute?
 Definition
2 p.s.i.
DMV 70
Term
During the Applied Leakage Test with a fully charged air system, the engine off, all brakes released, and the system settled, and the brake pedal firmly applied what is the maximum drop over the course of one minute?
 Definition
3 p.s.i.
DMV 71
Term
The air compressor governor must cut out prior to the needle reaching?
 Definition
130 p.s.i
DMV 71.
Term
At what pressure must the low air pressure warning device activate?
 Definition
Between 55 and 75 p.s.i.
DMV 71
Term
While checking the Air Pressure Buildup Rate the pressure should build from 85 to 100 p.s.i. within in how many seconds?
 Definition
45 seconds
DMV 72
Term
While checking the Air Pressure Buildup Rate the pressure should build from what pressure to what pressure within in 45 seconds?
 Definition
85 to 100 p.s.i.
Term
When the brakes are applied the push rod from the brake chamber should not move more what distance?
 Definition
Two inches DMV 118
Term
The angle between the push rod and the adjustor arm should be a little over what degrees when the brakes are released?
 Definition
90 degrees DMV 118
Term
If (blank) or more of of the leaf springs are missing or broken the vehicle is put out of service?
 Definition
1/4
DMV 118
Term
Minimum tread depth on steering axle tires is?
 Definition
4/32"
DMV 118
Term
What is the minimum tread depth on all non steering tires?
 Definition
2/32"
DMV 118
Term
When checking the brake chambers what are you looking for?
 Definition
Check to see that brake chambers are not leaking, cracked, dented, and are mounted securely
DMV 118
Term
When checking Brake Drums what are you checking for?
 Definition
Check for cracks, dents, or holes. Also check for loose or missing bolts.
DMV 118
Term
At what pressure do spring brakes apply?
 Definition
20 p.s.i. to 45 p.s.i.
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