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Precision Rebuilders Air Brake Trouble Shooting Guide
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The following Trouble Shooting Guide is reprinted with permission from CCJ's Air Brake book, an excellent reference for overall understanding of the air brake system. The authors of this condensed trouble shooter guide have a more complete (30pg.) version available. Contact Darwin Burkholder at 937-492-6613 or check out his website.
Component Performance Tests
Problem
#1
Air Leak at Brake (Foot) Valve Exhaust Port with Service and
Parking Brakes Released
Problem
#2
Air Leak at Exhaust Port of Rear Axle Tractor Relay with Service
and Parking Brakes Released
Problem
#3
Air Leak at Exhaust Port of Relay in Front Axle System with Service
Brakes Released
Problem
#4
Air Leak in Parking System Relay
Problem
#5
Air Leak at Exhaust Port of Quick Release Valve in Rear Axle
Tractor with Service and Parking Brakes Released
Problem
#6
Air Leak at the Exhaust Port of the Trailer Hand Control with
Tractor and Trailer Brakes Released
Problem
#7
Air Leak at the Exhaust Port of Tractor Protection Valve with
Tractor and Trailer Brakes Released
Problem
#8
Air Leak at the Exhaust Port of Park Control and Trailer Supply
with Tractor and Trailer Brakes Released
Problem
#9
Air Leak at the Exhaust Port of the following valves with Service
Brakes Applied
Problem
#10
High Pressure in Air System
Problem
#11
No Air Pressure Build-Up
Problem
#12
Excessive oil in Air System
Problem
#13
Slow or No Release of Brakes
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