This manual describes the maintenance and service of the Failsafe emergency brake system for Volvo FMX 6X6 vehicles
This service manual provides detailed instructions for installing, servicing, and troubleshooting the ABT™ Failsafe Emergency brake system on Volvo FMX 6x6 trucks. It covers hydraulic, electrical, and pneumatic system installation, pre-service inspections, control system setup, and step-by-step procedures for disassembly, component replacement, and bleeding. The manual also includes troubleshooting codes for control unit fault lights and maintenance schedules. It is intended for technicians and is based on the latest ABT™ product information, with references to Volvo vehicle manuals for standard component removal and installation.
| Brake Type | Spring Applied Hydraulic Release |
|---|---|
| Mounting Location | Input side of the rear differential carrier |
| Torque Range | 2000–2200 Nm for pinion shaft nut |
| Cooling Fluid | ABT™ Cooling Fluid |
| Hydraulic Fluid | ATF Dexron III |
It is designed as an emergency brake for use in the event of a service brake system failure and also acts as an additional parking brake.
The control unit PCB is too hot; remove any sources of heat and the fault will self-clear when the PCB temperature drops.
Approximately 800ml of ABT™ cooling fluid is required.
ATF Dexron III.