Subaru SVX 1992 Manual page 884

4-4 (W7130] BRAKES
B: INSTALLATION
1 ) To install, reverse removal procedures .
2) Adjust operating rod of brake booster as follows :
(1) Be sure engine is off. (No vacuum is applied to
brake booster.)
(2) There should be play between brake booster
clevis and pin at brake pedal installing portion .
(Depress brake pedal pad with a force of less than 10
N (1 kg, 2 Ib] to a stroke of 1 to 3 mm [0.04 to 0 .12 in] .)
Lock nut
1
I
I
v
Clevis pin
Brake booster ~- Clevis
operating rod
Pedal play
Play at pin 1 .0 - 3.0 mm
(0 .039 - 0.118 in)
C1-032
Fig . 118
(3) Depress the surface of brake pad by hand .
(4) If there is no free play between clevis pin and
clevis, loosen lock nut for operating rod and adjust
operating rod by turning in the direction that shortens
it .
3) Bleed air from brake system .
4) Conduct road tests to ensure brakes do not drag .
C: OPERATION CHECK
When checking operation, be sure to securely apply
the hand brake.
1 . CHECKING WITHOUT USING GAUGES
This method cannot determine the exact portion which
has failed, but it can provide a rough understanding of
the nature of the failure if checking is conducted in
accordance with the following procedure .
2. AIR TIGHTNESS CHECK
Start engine, and run it for 1 to 2 minutes, then turn it
off . Depress brake pedal several times applying the
same pedal force as that used in ordinary braking
operations. The pedal stroke should be greatest on the
1st depression, and it should become smaller with each
successive depression . If no change occurs in the pedal
height while in a depressed state, brake booster is
faulty .
In the event of defective operation, inspect the condi-
tion of the check valve and vacuum hose. Replace them
if faulty and conduct the test again. If no improvement
is observed, check precisely with gauges.
3. OPERATION CHECK
1 ) With engine off, depress brake pedal several times
applying the same pedal force and make sure that the
pedal height does not vary with each depression of the
pedal.
2) With brake pedal depressed, start engine .
3) As engine starts, brake pedal should move slightly
toward the floor. If no change occurs in the pedal
height, brake booster is faulty .
If faulty, check precisely with gauges.
4 . LOADED AIR TIGHTNESS CHECK
Depress brake pedal while engine is running, and turn
off engine while the pedal is still depressed . Keep the
pedal depressed for 30 seconds ; if no change occurs in
the pedal height, brake booster is functioning normally ;
if the pedal height increases, it is faulty .
If faulty, check precisely with gauges.
5. CHECKING WITH GAUGES
Connect gauges as shown in figure. After bleeding air
from pressure gauges, proceed to each check.
Pressure gauge
Vacuum gaugo
~
Adapter hose
! Vacuum hose
Pedal force gauge
B4-40s
Fig . 119
54