Rover 214 & 414 Service and Repair Manual - Rover club

9•14 Braking system
18.3 Wheel cylinder retaining bolts (A) and
brake pipe union nut (B)
18 Rear wheel cylinder -
removal, overhaul and refitting 4
Note: Before attempting to overhaul a rear
wheel cylinder, check the price and availability
of individual components and the price of a
new or reconditioned unit, as overhaul may
not be viable on economic grounds alone.
Removal
1 Remove the brake shoes.
2 Minimise fluid loss by removing the master
cylinder reservoir cap and then tightening it
down onto a piece of polythene to obtain an
airtight seal (taking care not to damage the
sender unit), or by using a brake hose clamp,
a G-clamp or a similar tool to clamp the
flexible hose.
3 Wipe away all traces of dirt around the
brake pipe union at the rear of the wheel
cylinder and unscrew the union nut. Carefully
ease the pipe out of the wheel cylinder and
plug or tape over its end to prevent dirt entry
(see illustration).
4 Unscrew the two wheel cylinder retaining
bolts from the rear of the backplate and
remove the cylinder, noting the rubber sealing
ring which is fitted between the cylinder and
backplate.
Overhaul
5 Remove the wheel cylinder from the vehicle
and clean it thoroughly.
6 Mount the wheel cylinder in a soft-jawed
vice and remove the rubber protective caps.
Extract the piston assemblies.
7 Thoroughly clean all components using
only methylated spirit, isopropyl alcohol or
clean hydraulic fluid as a cleaning medium.
Never use mineral-based solvents such as
petrol or paraffin which will attack the
hydraulic system’s rubber components. Dry
the components immediately using
compressed air or a clean, lint-free cloth.
8 Check all components and renew any that
are worn or damaged. Check particularly the
cylinder bore and pistons. The complete
assembly must be renewed if these are
scratched, worn or corroded. If there is any
doubt about the condition of the assembly or
of any of its components, renew it. Remove
the bleed screw and check that the fluid entry
port and bleed screw passages are clear.
9 If the assembly is fit for further use, obtain a
repair kit. Renew the rubber protective caps,
dust caps and seals disturbed on dismantling,
these should never be re-used. Renew also
any other items included in the repair kit.
10 On reassembly, soak the pistons and the
new seals in clean hydraulic fluid. Smear
clean fluid on the cylinder bore surface.
11 Fit the new seals to their pistons using
only the fingers to manipulate them into the
grooves. Ensure that all components are
refitted in the correct order and the right way
round.
12 Insert the pistons into the bore using a
twisting motion to avoid trapping the seal lips.
Apply a smear of rubber lubricant to each
piston before fitting the new rubber protective
caps.
Refitting
13 Fit a new sealing ring to the rear of the
wheel cylinder and place the cylinder in
position on the backplate.
14 Refit the wheel cylinder retaining bolts
and tighten them to the specified torque.
15 Tighten the brake pipe union nut and, if
necessary, remove the clamp from the brake
hose.
16 Refit the brake shoes.
17 Bleed the hydraulic braking system. If
precautions were taken to minimise fluid loss,
it should only be necessary to bleed the
relevant rear brake. On completion, check
that both footbrake and handbrake function
correctly before taking the vehicle on the
road.
19 Rear brake pads -
inspection
Refer to Chapter 1.
20 Rear brake pads -
renewal 2
Warning: Renew both sets of
rear brake pads at the same
time. Never renew the pads on
only one wheel as uneven braking may
result.
Removal
1 Chock the front wheels then jack up the
rear of the vehicle and support on axle stands.
Remove the rear roadwheels.
2 Undo the two bolts securing the caliper
shield in position and remove the shield from
the rear of the caliper.
3 Remove both caliper guide pin bolts whilst,
1689 Rover 214 & 414 Updated Version 09/97
if necessary, using a slim open-ended
spanner to prevent the guide pins from
rotating. Lift the caliper away from the disc,
noting the upper pad spring which is fitted to
the roof of the caliper. Tie the caliper to the
suspension strut using a piece of wire to avoid
straining the hydraulic hose (see illustration).
4 Remove the brake pads from the caliper
mounting bracket whilst noting the correct
fitted positions of the brake pads, pad retainer
springs and pad shims.
5 Inspect the pads as described for the front
brake pads and, if necessary, renew as a
complete axle set.
Fitting
6 Fit the pad retainer springs to the caliper
mounting bracket.
7 Apply a thin smear of Molykote M77
compound to the sides and back of each
pad’s metal backing and to those surfaces of
the caliper body and mounting bracket which
bear on the pads. In the absence of the
specified lubricant, a good quality hightemperature
brake grease (silicone- or
PBC/Poly Butyl Cuprysil-based) or anti-seize
compound (eg Holts Copaslip) may be used.
Fit the shims to the back of both pads, noting
that the smaller shim must be fitted to the
piston side pad, and apply a thin smear of
lubricant to the back of each shim. Do not
allow lubricant to foul the friction material.
8 Install the brake pads in the caliper
mounting bracket, ensuring that the friction
material is against the disc and the pad with
the smaller shim attached is fitted on the
inside.
9 If new pads have been fitted, it will be
necessary to retract the piston fully into the
caliper bore by rotating it in a clockwise
direction. This can be achieved by using a
suitable pair of circlip pliers as a peg spanner
or by fabricating a peg spanner for the task.
Provided that the master cylinder reservoir
has not been overfilled with hydraulic fluid,
there should be no spillage, but keep a careful
watch on the fluid level while retracting the
piston. If the fluid level rises above the MAX
level line at any time, the surplus should be
syphoned off or ejected via a plastic tube
connected to the bleed screw.
10 Ensure the upper pad spring is still in
position in the caliper then slide the caliper
into position in its mounting bracket. When
fitting the caliper, ensure that the lug on the
rear of the piston side pad is located in one of
the piston slots. Refit the caliper guide pin
bolts and tighten them to the specified torque
setting.
11 Depress the footbrake to bring the piston
into contact with the pads then check that the
lug on the piston side pad is located in one of
the piston slots. If necessary, remove the
caliper and adjust the piston position as
described above. Refit the shield to the rear of
the caliper.
12 Repeat the above procedure on the
remaining rear brake caliper.