Subaru 1600 Service Manual page 455

2. Removal
I) Remove the following parts at
engine compartment.
a. Disconnect connector for brake
fluid level indicator.
b. Remove nuts connecting brake
pipes to master cylinder.
c. Remove master cylinder installing
nuts.
d. Disconnect vacuum hose from
brake booster.
2)
Remove the following parts from
the pedal bracket.
a. Snap pin and clevis pin.
b. Four brake booster installing nuts.
3)
Remove brake booster while shun-
ning brake pipes.
3. Installation
I)
Mount brake booster in position.
I--~--
. Torque
(Brake booster
to toe board)
----------,
13 -- 23 N'm
I
( 1.3- 2.3 kg-m,
JI
9 - 17 ft-Ib)
.
--.---
2)
Connect operating rod to brake
pedal with clevis pin and snap pin.
~
I
~I
I , '
'---"'-~
~.' ~j
»~/;'
.
./.
\,
Nut ~
: - j
Fig. 10-59
A17~318
3)
Connect vacuum hose to brake
booster.
4)
Mount master cylinder onto brake
booster.
-------~-- ---~-~-~--~-~]
10- 16N-m
Torque
l_(NU~
. . __
L2
:;!~.1~
5) Connect brake
cylinder.
[
Torque
(Brake pipe
flare nut)
-1
1 -
,I
pipes to master
13 - 18 N'm
(1.3 - 1.8 kg-m,
9-13ft-Ib)
BRAKES
Master cylinder
2 Vacuum hose
Fig. 10-60
A17~250
6)
Connect electric connector for
brake fluid level indicator.
7) Tightening lock nut on operating
rod ASSY.
If brake pedal is not contacted stopper,
adjust clevis to contact stopper, then
tighten lock nut.
NOTE:
The brake pedal should contact
stopper without being depressed.
A16-251
Fig. 10-61 Tightening lock nut on
operating rod ASSY
8)
Bleed air from brake system.
- - - -
--~ -~.- -~- -I·-~ -.~~- -.-~
I
Torque 7-
l)
N·m
(Air bleeder (0.7- 0.9 kg-m,
I
screw) 5.1 - 6.5 ft-Ib)
---_.--
.----.~.----.
- - - - - - - - - - - - -
4. Operation Check
NOTE:
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
10-·18
the nature of the failure if checking
is conducted in accordance with the
following procedure.
a. Air tightness check
Start engine, and run it for I 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 depres-
sion. If no change occurs in the pedal
height while in a depressed state, brake
booster is faulty.
NOTE:
In the event of defective operation,
inspect the condition 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.
b. Operation check
(I)
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. I f no change occurs in the
pedal height, brake booster is
faulty.
NOTE:
If faulty, check precisely with gauges.
c. 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.
NOTE:
If faulty, check precisely with gauges.
2) Checking with Gauges
Connect gauges as shown in figure.
After bleeding air from pressure
gauges, proceed to each check.
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