Legacy Wagon 4WD F4-2.5L DOHC (1996)
Brake Pressure Hold Valve: Description and Operation
HILL-HOLDER SYSTEM
A: OUTLINE
The hill-holder is a device to make starting on an uphill road easier and permits even a driver not yet familiar with starting by use of the parking
brake to start the vehicle smoothly.
When pressing down the clutch pedal with the brake pedal depressed in order to start the vehicle on an uphill road, this device holds the brake
temporarily upon taking your foot off the brake pedal (until the clutch pedal is released). Therefore, smooth starting is enabled by usual
engagement of the clutch while depressing the accelerator pedal.
B: PRESSURE HOLD VALVE (PHV)
PHV (Pressure Hold Valve) is connected to one of the service brake pipes and pushrod (8) is pushed in and/or pulled out by cam shaft (2)
interlinked with the clutch pedal to change the clearance between ball (3) and seal (5), thereby opening and/or closing the hydraulic circuit.
Normally, on a flat road, ball (3) is located at the front and the valve is kept opened regardless of the position of the pushrod. (This status is the