4B-7 Front Brakes:
Piston seal
Piston seal is used to seal piston and cylinder and to
adjust clearance between pad and disc. Replace with a
new one at every overhaul. Fit piston seal into groove in
cylinder taking care not to twist it.
Piston and boot
1) Before inserting piston (1) into cylinder, apply brake
fluid to new cylinder boot (a) and piston (1). Install
cylinder boot onto piston as shown in the figure.
2) Fit boot as it is in above figure into boot groove in
cylinder with fingers.
3) Insert piston into cylinder by hand and fit boot in boot
groove in piston.
4) To confirm that boot is fitted in its groove in cylinder
properly, pull piston out of cylinder a little but do not
take it all out.
NOTE
Boot’s face (1) should be at the same level
from cylinder’s face (2) all around.
5) Install piston into cylinder by hand.
Caliper
Before installing caliper (cylinder body) to carrier, check
to ensure that guide pin (pin bolt) inserted in each caliper
carrier hole can be moved smoothly in thrust direction.
NOTE
Where temperature gets as low as –30 °C in
cold weather, use rubber grease whose
viscosity varies very little even at –40 °C (–40
°F).
Front Disc Brake Caliper Inspection
S5JB0A4206007
Cylinder Boot
Check boots for breakage, crack and damage. If
defective, replace.
A: 1 grooved side directed cylinder side
B: 2 grooved side directed cylinder pad side
I4RS0B420015-01
I2RH01420019-01
I2RH01420020-01
I4RS0A420004-01
IYSQ01420021-01
IYSQ01420022-01
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