Both brakes on Axle No. 3 fail to
Air lines crimped or leaking
and/or fittings leaking.
Relay spring valve No. 1 leaking.
Relay spring valve No. 1 faulty.
Air chambers faulty.
2. PARKING BRAKES ON AXLE NO. 3 DO NOT RELEASE.
Do both sets of parking
brakes on Axle No. 3 fail to re-
If only one parking
brake fails to release,
go to Step 5 of this
Parking brakes on Axles No. 4
and No. 5 operate correctly.
REASON FOR QUESTION
If only one parking brake fails to
release, problem is in air
chamber or brake components.
2-24. BRAKES SYSTEM TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanics: Automotive
(Item 74, Appendix G)
Pressure Test Kit (Item 50, Appendix G)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
The following troubleshooting procedures cover one set of brakes for Axle No. 3, but they apply to both
sets of brakes.
on Page 2-1751