Sunbeam ALPINE I SERIES: APLINE II SERIES, Руководство по ремонту, Страница: 278 / 413

WSM.12-4
Section K (Brakes) 5th re-issue
Page 19
RAPIE.R
FRONT BRAKES
DESCRIPTION
Each brake consists of an 11 in. (279 mm) diameter
high quality cast iron disc which is attached to and
rotates with the hub, and a cast iron caliper which
straddles the disc and is rigidly attached to the axle
carrier. The caliper houses two hydraulic piston
assemblies operating a pair of brake friction pads.
The pistons are protected by dust seals which are
held in place by metal retainers. Hydraulic sealing
between the cylinders and the pistons Is effected by
rubber rings positioned in grooves in the body. A
metal shield is fitted to protect the inner face of the
disc against grit.
Upon application of the brake pedal the hydraulic
pressure generated in the system causes the co­
axially aligned pistons to apply equal and opposite
pressure by the brake pads onto the rotating disc
in direct proportion to the foot effort applied at
the pedal.
The movement of the piston extrudes the rectan­
gular sectioned seal from the cylinder bore as
A
Fig. 12.
Piston seal conditions
illustrated In Fig. 12(A). On releasing the brake
pedal, the seal moves back to Its original position,
taking the piston with It, as illustrated In Fig. 12(8),
thus providing clearance between friction pads and
the discs when the brakes are not In use.
After negotiating a ford, water splash, or when
driving on flooded roads, it may be necessary to
dry out the brakes to restore full braking power by a
few light applications of the brake pedal. It Is also
advisable to do this after or during prolonged
driving In wet weather, under circumstances where
the brakes are not in use, such as may occur on
motorways etc.
BRAKE PADS
The friction linings are bonded to their pressure
plates and can therefore only be renewed by the
fitment of complete new brake pad assemblies.
The brake pads are supplied in a kit together with
new steady springs and split pins.
To remove (See Fig. 14)
I. Jack up the car and remove the appropriate
road wheel.
2. On the rear of each caliper (2) there are two
steady springs (5) which are held in place by
two split pins. On earlier cars, retaining pins
of the type shown in the inset of Fig. 13 were
used. To remove depress the steady springs
and withdraw the pins. The steady springs
may now be removed.
3. Remove the brake pad assemblies (10) by
rotating them within the caliper and withdraw­
ing.
To refit
I. Clean off any dirt from the protruding portions
of the pistons.
2. Push the pistons to the bottom of their cylinder
bores by levering with a screwdriver against
the edge of the disc. Whilst this is being carried
out, a check should be made on the fluid level
in the master cylinder in the case displaced
fluid returning to the reservoir causes it to
overflow.
3. Offer up the brake pad assemblies to the caliper
with the outside edges facing away from the
caliper. The outside edge of a brake pad may be
identified by a rectangular boss on the pressure
plate. The earlier design of brake pad did
not have this boss and the outside edge in
this case can only be identified by the fact