DESCRIPTION AND OPERATION
ABS DESCRIPTION AND OPERATION
This vehicle is equipped with an Advics HB-CI brake master cylinder assembly. The electronic
brake control module (EBCM) and the brake pressure modulator valve (BPMV) is serviced as
one assembly. The BPMV uses a 4 circuit configuration to control hydraulic pressure to each
wheel independently.
The following vehicle performance enhancement systems are provided.
Antilock Brake System (ABS)
Dynamic Rear Proportioning (DRP)
Hydraulic Brake Booster Power Supply
Traction Control System (TCS) (w/NW7)
Vehicle Stability Enhancement System (VSES) (w/JL4)
The following components are involved in the operation of the above systems:
ABS Pump Motor - The ABS pump motor is part of the hydraulic brake booster. The ABS
pump motor is active during ABS, VSES and base brake power assist functions.
Accumulator Pressure Sensor-The accumulator pressure sensor is located internally within
the BPMV. The accumulator pressure sensor uses a 5-volt reference and generates an output
signal proportionate to the hydraulic fluid pressure which is present in the accumulator.
Backup Lamp Switch- On vehicles equipped with manual transmissions, the EBCM receives
a voltage signal on the backup lamp supply voltage circuit when the vehicle is in reverse
gear. The EBCM uses the backup lamp supply voltage circuit to enhance the operation of
the ABS, VSES and TCS in reverse.
Yaw Rate Sensor/Lateral and Longitudinal Accelerometer (w/JL4)-The EBCM uses the
lateral and longitudinal accelerometers to determine the sideways and front to back
acceleration of the vehicle. The Yaw rate sensor determines the vehicle rotation. The lateral
accelerometer, yaw rate and longitudinal sensor are combined into one single component.
Longitudinal Accelerometer (w/o JL4)-The EBCM uses the longitudinal accelerometer to
determine the actual straight-line acceleration of the vehicle.
Master Cylinder Pressure Sensor-The master cylinder pressure sensor is located within the
BPMV. The master cylinder pressure sensor uses a 5-volt reference and generates an output
signal proportionate to the hydraulic fluid pressure which is present in the hydraulic brake
circuit at the master cylinder.
2007 Hummer H3
2007 BRAKES Antilock Brake System - H3