Page 57 - Vauxhall 20-60 H.P. (R Type) Chassis Shop Manual

VAUXHALL 20-60 SHOP MANUAL

BRAKES SQUEAKING

SECTION In the event of the brakes squeaking continually,, it is probably due to
274 the rear brakes being out of adjustment, in which condition braking takes
place on the 214 front wheels only, while the rear brakes are pulled on
just sufficiently to rub the drums, due to the safety stops provided on
the compensating mechanism. This rubbing is only sufficient to cause the
squeaking and does not have any braking effect, consequently, while the
brakes are in this condition, the front ones take all the braking load, causing
excessive wear on the front»brake shoe liners.

Readjust brakes as detailed in ( Section 263 ).

BRAKES SPRAGGING

SECTION Spragging brakes may be due to one’ of the following causes:-
275 ( a ) Brakes out of adjustment.

( b ) Brake linings sticky with, oil or grease.

In the first case ( a ), the rear brakes are so badly out of adjustment that
they have practically, no braking effect and all the load is thrown on the
front brakes, which become dangerously powerful and momentarily lock
the wheels, thus giving the impression of spragging. Read just brakes as
detailed in ( Section 263 ).

If the trouble continues after the brakes have been correctly adjusted, it will
be due to the second condition ( b ).

In the case of the front wheel brakes, over-lubrication of the pivot pins or
forcing too much grease into the hub bearings will cause the lubricant to
work its way through onto the brake shoe liners and will be absorbed by
them, giving a tacky condition of liner and brake drum and consequently
greatly increasing the coefficient of friction, with the result that the brake
will be self-applying.

Over-lubrication of the rear axle will tend to force too much oil along the
axle shaft and ultimately reach the brake liners, thus having a similar effect.

In this case it will be necessary to remove the hub and brake drum assembly
and thoroughly burn off with a blow lamp the oil on the liners. In the case of
the rear, it is essential to remove the brake shoes ( Sections 270 and 273 ),
owing to the proximity of the petrol tank. Before replacing the brake drums,
clean the brake gear and the inside of the drums with petrol and, if necessary,
polish the friction surfaces of the drums with emery cloth.

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