Riviera V6-231 3.8L VIN L SFI (1991)
Hydraulic Assembly: Description and Operation
The solenoid valves are located inside the hydraulic modulator and are not serviceable. The solenoid valves increase, decrease or maintain the brake
fluid pressure to the wheel circuits. During anti-lock braking the valves are controlled by signals from the EBCM. During normal braking, the valves are
positioned in the pressure increase or open position.