Prizm L4-108 1.8L DOHC VIN 8 MFI (1998)
Brake Proportioning/Combination Valve: Description and Operation
The proportioning valve is located on the vehicle cowl behind the engine.
The proportioning valve limits the outlet pressure to the rear brakes after a predetermined master cylinder pressure is reached. This feature is used when
less rear apply force is needed. This feature performs the following functions:
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Allows smooth braking action
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Reduces the chances of rear wheel lockup during normal braking