MG MGA Twin Cam Workshop Manual page 151

THE BRAKING SYSTEM
M
Unscrew the two calliper retaining bollS a nd remove
the calliper assembly complete with cylinders.
Take care not to misplace the shims which a re tilted
behind the mounting lugs on the calliper body. The shims
must be retained
for
reassembly
and
r eplaced
in
their
original positions.
Rear
Unscrew the Ouid supply pipe unio n (below the inner
cylinder block) and disconnect and blank off the pipe.
Remove the split pin and clevis p in from the hand brake
cable yoke to disconnect the cable from the calliper lever.
Tap back the tab washers a nd unscrew the two set
screws securing the calliper to the mounting tlange on the
ax!e. The calliper complete with parking mechanism may
now
be
removed from the vehicle.
The shims taken from behind the calliper body mount·
ing lugs must be retained and replaced in tbelr original
positions on r eassembly.
Section M.8
DISMAI'<ILING A BRAKE UNIT
The brake must
be
thoroughly clea ned before p ro-
ceewng with the dismantling. It is recommended that a
new dust seal should be fitted whenever the u nit is
dismantled.
Withdraw the brake pads as described in Section
M. ll. Disconnect and blank o ff the supply pipe (if the
unit is being d ismantled o n the vehicle) and remove the
bridge pipe.
Fig. M.4
A rear disc brake caliper ,.·itfr hand brake carriers
MG A (Twin Cam). Issue 2. 23026
Fig.
M.S
Sectioned ••iew of a brake caliper
Remove the bolts securing the cylinder blocks to the
calliper and withdraw the cylinder blocks.
Disengage the d ust seal from the lip on the cylinder
block face, connect the cylinder to a source of fluid
supply, a nd apply pressure to eject the piston assembly.
Remove the screws secu ring the plate to the piston, lift
o ff the plate a nd piston seal. and withdraw the retractor
bush from within the piston bore. Carefully cut away and
discard the dust seal.
Support the backing plate on a bush of sufficient bore
just to accommodate the piston; with a suitable tubular
distance piece placed against the end of the piston spigot
around the shouldered head press out the piston from
the backing plate. Care must
be
taken during the opera-
tion to avoid damaging the piston.
Section M.9
ASSEMBUNG A BRAKE UNIT
Clean all components thoroughly, using only the
recommended brake fluid for all rubber parts.
M.S