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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