This Bendix air brake troubleshooting guide (publication BW1396, 2013) is a structured two-page diagnostic reference covering the complete air brake system on trucks, tractors, trailers, and buses. It provides six sequential tests with corresponding checklists and a CVSA maximum allowable stroke chart, designed for technicians performing systematic air brake inspections and repairs.
Official Bendix air brake troubleshooting document details
| Brand | Bendix (Knorr-Bremse Group) |
| Model coverage | Straight trucks, buses, bobtail tractors, tractor/trailer and tractor/two-trailer combinations |
| System / Group | Bendix Air Brakes / Manuals |
| Publication no. | BW1396 |
| Year / Revision | 02/2013 |
| Pages | 2 |
| File size | 1.0 MB |
| Format | |
| Language | English |
Document table of contents
- Test 1 – Air system build-up and governor operation (low pressure warning, build-up time, governor cut-out/cut-in)
- Checklist 1 – Warning lamp, governor, and compressor corrections
- Test 2 – Leakage test and pressure drop limits (single vehicle, tractor/trailer, tractor/two trailers)
- Checklist 2 – Supply-side leakage sources (relay valves, dual brake valve, governor, compressor discharge line)
- Test 3 – Pressure Modulator Valve (PMV) and Traction Control Valve (TCV) chuff test with Bendix EC-60 controller sequence
- Test 4 – Brake chamber push rod travel and slack adjuster angle check (80–90 psi applied)
- Checklist 4 – Service-side leakage sources (stoplight switch, double check valve, spring brake chamber diaphragms)
- Test 5 – Manual parking brake operation for straight trucks, buses, and tractor/trailer combinations
- Checklist 5 – Sluggish performance and trailer brake actuation corrections
- Test 6 – Dual circuit system integrity check, emergency braking, tractor protection valve operation, and pop pressure test
- Checklist 6 – Component leakage corrections (MV-3 valve, pressure protection valves, relay valves)
- CVSA maximum allowable stroke chart (Type 12 through Type 36 chambers)
- Typical tractor system schematic with Bendix components
- Typical truck system schematic with Bendix components
Applicable truck models
This guide applies broadly to North American commercial vehicles equipped with Bendix air brake components, including straight trucks, buses, bobtail tractors, and tractor/trailer combinations. Referenced Bendix components include the EC-60 ABS/ATC controller, AD-9/AD-IP/AD-IS air dryers, E-8P/E-6 brake valves, R-12/R-14 service relay valves, TP-3DC tractor protection valve, MV-3 control valve, M-32/M-32QR modulators, ADB-22X air disc brakes, ES drum brakes with Versajust automatic slack adjusters, SB-4 spring brake chambers, Tu-Flo 550/750 and BA-921/BA-922 compressors, and WS-24 wheel speed sensors. A companion wallchart version is available as BW1231. Visit Bendix Commercial Vehicle Systems for additional service data sheets and training resources.
Who needs this Bendix air brake troubleshooting manual
Fleet maintenance technicians, independent diesel mechanics, and workshop owners responsible for DOT inspections and CVSA compliance will find this reference essential. It delivers a step-by-step pass/fail workflow covering every major subsystem from compressor output through foundation brakes, with allowable pressure drop values and maximum push rod stroke limits ready for quick reference during roadside or in-shop diagnostics.
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