Brake Booster Operational Test - Toyota Hilux Surf 1993 Owner's Manual

BRAKE SYSTEM – Checks and Adjustments
4. CHECK THAT PEDAL RESERVE DISTANCE IS CORRECT,
AS SHOWN
Release the parking brake.
With engine running, depress the pedal and measure the
pedal reserve distance, as shown.
Pedal reserve distance from asphalt sheet at 490 N (50
kgf, 110.2 lbf):
(2WD)
22R–E Engine
3VZ–E Engine
1 ton
1/2 ton
C&C
SRW
DRW
(4WD)
If incorrect, troubleshoot the brake system.
OPERATIONAL TEST OF BRAKE BOOSTER
HINT: If available, use a brake booster tester to check
the booster operating condition.
1. OPERATING CHECK
(a) Depress the brake pedal several times with the en–
gine off, and check that there is no change in the
pedal reserve distance.
(b) Depress the brake pedal and start engine. If the
pedal goes down slightly, operation is normal.
2. AIR TIGHTNESS CHECK
(a) Start the engine and stop it after one or two min–
utes. Depress the brake pedal several times slowly.
If the pedal goes down deepest the first time, but
gradually 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 seconds, the booster is air tight.
More than 70 mm (2.76 in.)
More than 75 mm (2.95 in.)
More than 65 mm (2.56 in.)
More than 75 mm (2.95 in.)
More than 55 mm (2.17 in.)
More than 65 mm (2.56 in.)
BR–7