Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual

Page: 310 / 413

WSM. 124
Section K (Brakes)
WHEEL CYLINDERS
To remove and refit
I. Remove the brake shoes from the back plate,
see under "Brake shoes-To remove and refit".
2. Detach the handbrake cable or rod from the
wheei cylinder lever by withdrawing the spring
clip from the clevis pin, removing the plain
and spring washers and the clevis pin from the
cable forkend or by releasing the spring clip
from the upturned end of the brake rod.
3. Withdraw the hydraulic pressure pipe(s) from
the wheel cylinder by releasing the union nut(s),
trapping any escaping fluid in a drip tray.
4. Remove the wheel cylinder from the back plate
by detaching the rubb!!r dust cover and sliding
the wheel cylinder in the back plate slot towards
the piston end, then manoeuvring the opposite
end out of the slot.
5, Refitting is the reverse of the removal sequence
but particular attention must be given to the
following:-
I. Grease the back plate slot sparingly with
high melting point grease, ensure that the
wheel cylinder moves freely within the slot
both before and after the rubber dust cover
is fitted.
ii. The brake shoes are titted, see under
"Brake shoes-To remove and refit".
iii.
When a new wheel cylinder is fitted, check
the operation of the handbrake.
Page 51
To dismantle and reassemble
I. Clean off all road dirt and when working on
two wheel cylinders, identify them left or right
hand.
2. Remove the tappet and adjuster wheel from the
outer piston by removing the rubber band.
3. Withdraw the outer piston and pressing from
the wheel cylinder; it will be necessary to
rotate the piston a short distance to disengage
the pin in the end of the pressing from the
adjuster pawl.
4. Remove the adjuster pawl, tension spring and
mounting plate from the wheel cylinder by
withdrawing two bolts. Remove the lever by
ejecting the pivot pin.
5. Eject the inner piston from the wheel cylinder
by applying low pressure air to pressure pipe
or bleed screw tappings.
6. Remove the rubber seals from the inner and
outer pistons.
7. Reassembly is the reverse of the dismantling
sequence but particular attention must be given
to the following:-
!. All parts must be meticulously clean and
reassembled under equally clean conditions.
ii. The tapered seal Is titted to the inner piston
using a liberal coating of brake fluid and
with the wider end of the taper away from
the slotted end of the piston.
iii.
Smear the inner piston and seal with brake
fluid and feed the piston, seal end first,
into the body exercising care not to damage
the fine edge of the seal and so the longest
side of the slot in the piston aligns with the
slot in the wheel cylinder body.
iv. The rectangular seal is fitted to the outer
piston using a liberal coating of brake fluid
and fed into the wheel cylinder body,
engage the pin at the end of the pressing
In the groove in the adjuster pawl.
v. The hexagon and round headed tappets have
left and right hand threads respectively and
::!re fitted to the right and left hand wheel
cylinders respectively.