Toyota Celica Supra 1986 Service And Repair Manual page 484

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OPERATIONAL TEST OF BRA.KE BOOSTER
~-·
NOTE: If available, use a brake booster tester to check
t ~.l
the booster operating condition.
GOOD NO GOOD
1. OPERATING CHECK
(a) Depress the brake pedal several times with the engine
off, and ch~k that there is no change in the pedal
reserve distance.
(b) Depress the brake pedal and start the engine. If the
pedal goes down slightly, operation is normal.
2. AIR TIGHTNESS
{a) Start the engine and stop
it
after one or two minutes.
Depress the brake pedal several times slowly. If the
pedal goes down furtherest the first time, but grad·
ually rises after the second or third time, the booster
is air
tight.
(b) Depress the brake pedal while the engine is running,
and stop it with the pedal depressed. If there is no
change in pedal reserve travel after holding the pedal
for thirty secoods, the booster is air tight.
BLEEDING OF BRAKE SYSTEM
NOTE: If any work is done on the brake system or if air
is
susp~ted
in the brake lines, bleed the system of air.
CAUTION : Do not let brake fluid remain on a painted
surface. Wash it off immediately.
1. FILL BRAKE RESERVOIRS WITH BRAKE FLUID
Ch~k
the reservoir after bleeding ea<:h wheel. Add fluid,
if
necessary.
2. BLEED MASTER CYLINDER
NOTE: If the master cylinder was disassembled or if the
reservoir tank becomes empty, bleed the air from the
master cylinder.
(a) Disconnect the brake tubes from the master cylinder.
(b) Depress the brake pedal and hold it.
(c) Block off the ootlet plug with your finger, and release
the brake pedal.
(d) Repeat (b) and (c) three or four times.