Subaru 2009 IMPREZA, Service Manual

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BR-33
Brake Booster
BRAKE
B: INSTALLATION
1) Check and adjust the operating rod of the brake
booster.
Specification L:
136.3 mm (5.37 in)
If it is out of specification, adjust it with the brake
booster operating rod.
2) Mount the brake booster in position.
3) Install clevis pin and snap pin which secure the
operating rod to the brake pedal.
NOTE:
Apply a thin coat of KOPR-KOTE (Part No.
003603001) to the clevis pin.
4) Connect the vacuum hose to the brake booster.
5) After replacing the O-ring, install the master cyl-
inder to brake booster.
6) Connect the brake pipes to the master cylinder.
7) Connect the connector of the brake fluid level
gauge.
8) Apply grease to the operating rod connecting pin
to prevent it from wear.
9) Bleed air from brake system.
Tightening torque (air bleeder screw):
8 N·m (0.8 kgf-m, 5.9 ft-lb)
10) Perform a road test to make sure the brakes do
not drag.
C: INSPECTION
NOTE:
If the vehicle is equipped with a brake assist mech-
anism, the following may result when the brake
pedal is depressed. They are normal conditions
that occur when the mechanism is performing prop-
erly.
• Brake feel is soft when brake pedal is depressed
hard or quicker than usual.
• A light crack is heard when brake pedal is de-
pressed hard or quicker than usual.
1. OPERATION CHECK
(WITHOUT GAUGES)
CAUTION:
When checking operation, be sure to apply the
parking brake securely.
• CHECK WITHOUT GAUGES
This method can not determine exactly what part is
defective. But it is possible to identify the outline of
the defect by performing the check according to the
following procedures.
(1) Nut
(2) Clevis pin
(3) Snap pin
(4) Operating rod
(5) Brake pedal
BR-00076
L
(2)
(4)
(5)
(3)
(1)
BR-00685
(1) Primary piston
(2) O-ring
(3) Do not install the O-ring on this groove.
BR-00363
(1)
(2)
(3)