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Brake Parts - Front Axle
Section 165-0020
8. Inspect brake pads (4 & 5) per Step 1 in the
'General Inspection Procedure'.
9. Clean torque plate (15) making sure no solvent
remains in the oil passages or grooves. Inspect dust
boot and seal grooves, and, land areas between
grooves for damage or cracks. Minor nicks and
scratches may be blended with crocus cloth. Replace
torque plate (15) if corrosion is excessive or dust
boot and seal grooves are damaged, prohibiting
proper rebuild of brake head.
10. Inspect pistons (11) for minor scratches and
nicks and blend with crocus cloth. If piston is badly
nicked or scratched or if the chrome plate is worn off,
replace piston.
11. Torque pins (3 & 6) which are deeply grooved
should be replaced.
ASSEMBLY
Numbers in parentheses refer to Fig. 2 unless
specified otherwise.
Note: Tighten all fasteners without special torques
specified, to torques listed in Section 300-0080,
STANDARD BOLT AND NUT TORQUE
SPECIFICATION.
1. Lubricate packings (13), seals (10) and pistons
(11) with petroleum base lubricating oil or vaseline.
WARNING
Do not use brake fluid (SAE J1703).
2. Install backup rings (14), packings (13) and boots
(12) into torque plate (15) piston bores. Lubricate per
Step 1.
3. Install pistons (11) in torque plate (15) as follows:
Position lubricated piston (11) into dust boot (12) and
piston bore, holding piston at a slight angle. Insert
forefinger between piston and dust boot and rotate
forefinger around piston OD, lifting dust boot ID over
OD of piston. Make sure OD lip of dust boot remains
in the groove in the piston bore.
4. After piston (11) is through dust boot (12), centre
piston by feel over packing (13). Apply, by hand, a
turning thrusting pressure, working piston into and
through packing.
5. When assured pistons (11) are through packings
(13), pressure other than hand pressure may be used
4
to press pistons the remainder of the way into piston
bores. Snap open end of boot (12) into groove of
piston.
6. Install seals (10) and piston plugs (9) into open
end of piston bores of torque plate (15).
7. Attach cover plate (8) to torque plate with bolts (7)
and washers (16). Tighten bolts (7) to a torque of
380 Nm (280 lbf ft).
8. When installing torque pins (3 & 6) and bolts (2)
make sure the groove in the pin is directly under the
bolt so that bolt (2) can perform its locking and
retaining function.
Note: Lubricate torque pins (3 & 6) with a corrosion
resistant lubricant prior to installation, to facilitate
next pin removal.
9. Replace brake disc (1, Fig. 1) if worn per
instructions under 'General Inspection' in this section.
Refer to Section 140-0040, WHEEL, RIM AND TYRE,
for replacement instructions.
INSTALLATION
Numbers in parentheses refer to Fig. 1, unless
otherwise specified.
Note: Tighten all fasteners without special torques
specified to torques listed in Section 300-0080,
STANDARD BOLT AND NUT TORQUE
SPECIFICATION.
WARNINGS
To prevent personal injury and property
damage, be sure blocking or lifting equipment
is of sufficient capacity and properly secured
to do the job safely.
Use extreme caution to prevent personal
injury when installing wheel. The exact
procedure must be adhered to as described in
Section 140-0040, WHEEL, RIM AND TYRE.
1. Install washers (5) on bolts (4).
2. Position brake head over brake disc on brake
mounting plate, aligning holes. Install assembled
bolts (4) and washers (5) through mounting plate and
into torque plate. Tighten bolts (4) to a torque of 610
Nm (450 lbf ft).
Note: Ensure torque pins (3 & 6, Fig. 2) do not touch
SM 1186 2-98
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