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Chapter 5 Wheels, brakes and tyres

3 Front wheel: removal

1 With the machine supported on the centre stand, block the

stand and crankcase to raise the wheel clear of the ground.
2 Detach the speedometer drive cable at the wheel, by un-
screwing the knurled gland nut which retains it. Remove the

front brake cable.

3 Remove the wheel spindle nut and split pin, and withdraw

the spindle with the aid of a tommy bar. The wheel can now be
lowered clear of the forks and put to one side.

4 Front brake: examination and renovation

1 With the wheel removed from the forks, as described in the

preceding Section, the brake plate assembly can be removed

from the drum.
2 Examine the drum surface for signs of scoring or oil con-
tamination. Both of these conditions will impair braking
efficiency. Remove all traces of dust, preferably using a brass
wire brush, taking care not to inhale any of it, as it is of an
asbestos nature, and consequently harmful. Remove oil or
grease deposits, using a petrol soaked rag.
3 If deep scoring is evident, due to the linings having worn
through to the shoe at some time, the drum must be skimmed
on a lathe, or renewed. Whilst there are firms who will

undertake to skim a drum whilst fitted to the wheel, it should be

borne in mind that excessive skimming will change the radius of

the drum in relation to the brake shoes, therefore reducing the
friction area until extensive bedding in has taken place. Also full

adjustment of the shoes may not be possible. If in doubt about
this point, the advice of one of the specialist engineering firms
who undertake this work should be sought.
4 If fork oil or grease from the wheel bearings has badly con-
taminated the linings, they should be renewed. There is no
satisfactory way of degreasing the lining material, which in any

case is relatively cheap to replace. Measure the thickness of the
friction material; if it is worn at any point to or beyond the
specified wear limit, both shoes must be renewed immediately.

It is a false economy to try to cut corners with brake

components; the whole safety of both machine and rider being
dependent on their good condition.

5 The linings are bonded to the shoes, and the shoe must be
renewed complete with the new linings. This is accomplished
by folding the shoes together until the spring tension is relaxed,
and then lifting the shoes and springs off the brake plate. Fitting
new shoes is a direct reversal of the above procedure.

6 Before refitting existing shoes, roughen the lining surface
sufficiently to break the glaze which will have formed in use.
7 The camshaft can be displaced for greasing prior to
reassembly, after removing the actuating lever. No further
attention is normally required. Note the alignment marks on the
camshaft splined end, and on the lever. These must align on
reassembly.

Fig. 5.1 Front wheel and brake - component parts

3
4
5
6

Wheel spindle

Spacer

Hub

Distance piece

Wheel rim
Tyre

Inner tube
Rim tape
Speedometer drive gear

washer

Brake plate

12 Brake shoe -2 off

Camshaft