Hydraulic Control Assembly - Antilock Brakes: Description and Operation

Brake Pressure Modulator Valve
The Brake Pressure Modulator Valve (BPMV) is part of the EHCU. The BPMV is the hydraulic portion of the EHCU. The EBCM controls the BPMV. The BPMV is split into the following three hydraulic channels:
- Left front
- Right front
- Rear
Each channel has an isolation valve and a dump valve. The front channels share a low pressure accumulator, attenuator, and a pump. The rear channel shares use of the pump, but uses it's own low pressure accumulator and attenuator.

Electro-Hydraulic Control Unit
The Electro-Hydraulic Control Unit (EHCU) is located in the left hand side of the engine compartment. The EHCU assembly includes the Electronic Brake Control module (EBCM) and the Brake Pressure Modulator Valve (BPMV).The EHCU regulates hydraulic pressure in the brake system during an antilock stop.