Subaru XT 1988 Service Manual page 955

4-4
BRAKES
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@
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Front
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-----1....;::::,.I---+__
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Fig. 19
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...
To rear LH
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brake
1 Body
8 Push rod
2 Camshaft 9 Spring
3 Ball
10 Boot
4 Ball guide 11 Collar
5 Seal
12 Lever
6 Plate spring 13 O-ring
7 Cap
14 O-ring
Pressure hold valve
• Activating condition
L4-917
This device is activated only when depressing the clutch and
brake pedals with the vehicle stopped on an uphill road.
A 17-264
Fig. 20
When stopping the vehicle on an uphill road, the ball rolls
toward the rear to seal the port and therefore the hydraulic
pressure is maintained even by releasing the brake pedal.
8
• Inactive status
This accessory is not activated in any status other than the
above.
1) While driving
(1) During acceleration or usual driving
A17-265
Fig. 21
Since the clutch pedal is not depressed, the pushrod is
located outside the port. In this status, hydraulic pressure
cannot be maintained.
(2) During deceleration
A 17·266
Fig.
22
Even when depressing the clutch pedal, the ball is kept at
the front by decelerating force. In this status, hydraulic
pressure is not maintained.