Envoy 4WD V6-4.3L VIN W (1998)
Hydraulic Control Assembly - Antilock Brakes: Description and Operation
The Brake Pressure Modulator Valve (BPMV) is part of the Electro-Hydraulic Control Unit (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:
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Left front
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Right front
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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.
