Sable V6-3.0L VIN U (1999)
Brake Pressure Hold Valve: Description and Operation
The brake pressure control valve:
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regulates the hydraulic pressure in the rear brake system.
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is a fixed-type located at the body side member under the brake booster on station wagons with or without anti-lock brakes. Valve is different
based on whether or not system has anti-lock brakes.
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is a height sensing variable-type located between the body and LH rear suspension quadra-link on the sedan with or without anti-lock brakes.
Valve is the same on all sedans.
A junction block is located on the body sidemember under the brake booster on sedans without anti-lock brakes.
Operation is as follows:
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When brake pedal is applied, the rear brake fluid pressure passes through the control valve to the rear brake system until the valve's
pre-determined maximum pressure point is reached.
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The control valve maintains the pre-determined maximum hydraulic pressure to the rear brakes, creating a balanced braking condition between the
front and rear wheels to minimize rear wheel skidding during hard braking.
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The height sensing feature of the sedan's brake load sensor proportioning valve increases the maximum pressure to the rear brakes as the lever is
moved toward the valve.
