28
BRAKES
Inspect the wheel cylinder dust cover for cuts, cracks,
hardening or other sign of deterioration. If indoubt the
dust cover needs replacement.
If the system has been contaminated with mineral
fluid of any type, the system should be flushed out
with fresh Brake Fluid or Alcohol and all rubber parts
including hoses should be replaced.
For example a contaminated seal may be identified
by comparing it with a new seal (but do not let them
touch). If the old one is appreciably larger, seal
contamination is indicated. Whenever wheel
cylinders are serviced, replacement of seals and
dust covers from an appropriate wheel cylinder
repair kit is strongly recommended.
ASSEMBLING OF WHEEL CYLINDER
When properly inspected, assemble as follows:
1. Lubricate the wheel cylinder bore liberally with
fresh brake fluid. Dip new gland seals and pistons
in fresh brake fluid.
2. Assemble gland seals on to the pistons in such a
way that it fits squarely on the piston stem (seal lip
should be towards the thin collar of the piston).
3. Assemble the spring on to the one of the piston
stems.
4. Assemble the piston assembly into the cylinder
bore with the spring leading into the bore carefully
easing the seal lip.
5. Insert the other piston with the seal from the other
end.
6. Fit the dust covers to the wheel cylinder mouth
and piston.
7. Fit the bleed screw and tighten to 0.55 - 0.8 mkg
torque.
8. Fit a rubber band around the pistons to retain
them in the bore.
ABSOLUTE CLEANLINESS HAS TO BE
MAINTAINED AND A CLEAN BRAKE FLUIDMUST
BE USED. NEVER USE BRAKE FLUID BLED
FROM THE SYSTEM.
REFITTING OFWHEEL CYLINDER
Install the wheel cylinder assembly on to the backplate
and secure with the bolts and washers. Tighten the
wheel cylinder mounting bolts and washers. Tighten
the wheel cylinder mounting bolts to a torque of 0.54
to 0.68 mkg. Fit the adaptor with a new gasket on to
the feed port and tighten to a torque of 2.5 to 2.8 mkg.
Remove the rubber band from the wheel cylinder.Refit
the brake shoes as described under “Fitting Shoes”.
Connect the bundy pipe to the adapter port.
Refit drum and wheel.
Bleed the system.
Fig. 29




