Hombre S Regular Cab 4WD V6-4.3L (1999)
Brake Proportioning/Combination Valve: Description and Operation
Dynamic Rear Proportioning (DRP)
Dynamic Rear Proportioning (DRP)
Dynamic Rear Proportioning is a control system that replaces the hydraulic proportioning function of the combination valve in the base brake system.
The DRP control system is part of the operating software in the EBCM. It utilizes active control with the existing ABS to regulate the vehicle's rear
brake pressure. the resulting benefits are:
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Optimized front/rear brake balance
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Improved braking efficiency
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Improved front to rear brake pad wear balance
DRP is active when the vehicle is decelerating above a programmed threshold and the rear wheels are at low levels of slip. This threshold is particular
to each weight class of vehicle. DRP can not activate if any of the following conditions exist
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Vehicle is in 4WD mode
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BRAKE warning lamp is illuminated
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Brake pedal not depressed, or brake switch closed
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An ABS system malfunction critical to DRP operation is present
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More than two ABS system malfunctions of different types are present
DRP operation is transparent to the driver. If the vehicle is braking under DRP control and the wheel speed sensors detect an ABS event, the ABS will
take control over DRF until conditions warrant the return to normal braking/DRP operation. For further discussion of DRP malfunction modes, refer
to Antilock Brake Systems; Testing and Inspection; Procedures; Description of On-Board Diagnostics; Self-Diagnostics.
