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If
the clearance between the
gauge body and
adjusting nut is
0.4
mm
(0.02
inl, the pushrod-to-
piston
clearance
is 0 mm. However, if the
clearance
between the gauge body and adjusting nut
is
0 mm,
the
pushrod-to-piston
clearance is 0.4 mm (0.02 in)
or
more. Therefore it must be
adjusted
and
rechecked.
6. If
clearance
is incorrect, loosen the star
locknut.
and
turn
the adjuster in or out to
adjust.
•
Adjust the
clearance
while
the specified vacuum
is applied
to
the booster.
• Hold the
clevis
while adjusting.
7.
Tighten the
star
locknut
securely.
8. Remove the
special
tool.
0- 0.4 mm (0 - 0.02 in)
-
STAR LOCKNUT
22N'm
PUSHROD
ADJUSTMENT GAUGE
07JAG -
SO~'00
12.2 kgf·m. 'SlbH"
ADJUSTER
9
.
Adjust the
push
rod length as shown
if
the booster
is removed
.
PUSHROD
LOCKNUT
,
.5N·m 11.5
kgl·m. " IbH"
10.
Install the master
cylinder (see
page
19-131.
Brake Booster Inspection
Functional Test
1.
With
the engine stopped,
press the brake
pedal
sev-
eral times to deplete the
vacuum
reservoir, then
press the pedal hard, and hold it for
15
seconds. If
the pedal
sinks, either the
master
cylinder
is
bypassing internally, or the brake
system
(master
cylinder, lines, modulator, proportioning valve, or
caliper) is leaking.
2.
Start the
engine
with the pedal pressed. If the pedal
sinks slightly, the
vacuum
booster
is operating
nor-
mally. If the pedal height does not
vary,
the booster
or
check
valve
is
faulty.
3.
With the engine running, press the brake pedal light-
ly. Apply just
enough
pressure
to
hold
back
auto-
matic transmission
creep.
If the
brake
pedal
sinks
more than 10
mm (3/8 in.)
in three minutes, the mas-
ter cylinder is faulty. A
slight change
in pedal height
when
the AlC compressor cycles on and
off is nor-
mal. (The
AlC
compressor
load
changes the
vacuum
available to the
booster.)
Leak Test
1.
Press the brake pedal with the engine running, then
stop the
engine.
If
the
pedal height
does
not vary
while pressed for 30
seconds,
the
vacuum
booster is
OK. If
the pedal
rises, the booster
is
faulty
.
2.
With
the engine
stopped,
press the brake
pedal sev-
eral times using normal pressure. When the pedal is
first pressed,
it should
be
low.
On
consecutive
appli-
cations,
the pedal height should gradually
rise.
If the
pedal
position does not
vary, check
the booster
check
valve.
Booster Check Valve Test
1.
Disconnect the brake booster
vacuum
hose at the
booster.
2.
Start the
engine, and
let it idle. There
should
be
vac-
uum. If no
vacuum
is
available,
the
check valve
is
not working properly. Replace
the
brake booster
vacuum hose and check
valve, and
retest.
19-15
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Table of Contents
Troubleshooting
