Subaru XT 1988 Service Manual page 984

BRAKES
4-4
DISASSEMBLY PROCEDURE
1) Remove Coring with Coring pliers pushing in primary
piston slightly.
Piston may jump out from master cylinder.
Primary piston
ASSEMBLY
PRECAUTIONS FOR ASSEMBLING
1) When assembl ing, be sure to use recommended brake
fluid.
2) Ensure that the inside wall of cylinder, pistons, and piston
cups are free from dirt when assembling.
3) Be extremely careful not to damage, scratch, or dent
cylinder inside wall, pistons, and piston cups.
4) Do not drop parts. Never attempt to use any part that has
been dropped accidentally.
ASSEMBLING OPERATION
1) Assembling piston CP:
Apply recommended brake fluid to inside wall of cylinder, and
to outer surface of piston CP, and install piston CPs carefully
into cylinder.
Push in primary piston slightly. L4-835
2) Assembling Coring:
~--------------------~~----------~
Fig. 92
With primary piston pushed in slightly, attach Coring by using
Coring pliers.
2) Extract primary piston CP and secondary piston CPo
I.
Do not disassemble the piston CP; otherwise, the spring set
value may be changed.
b. Use brake fluid or methanol to wash inside wall of cylinder,
pistons and piston cups. Be careful not to damage parts when
washing. If methanol is used for washing, do not dip rubber
parts, such as piston cups, in it for more than 30 seconds;
otherwise, they may become swelled.
INSPECTION
If any damage, deformation, wear, swelling, rust, and other
faults are found on the primary piston CP, secondary piston
CP, secondary piston stopper, or gasket, replace the faulty
part.
a. The primary and secondary pistons must be replaced as
complete assemblies.
b. The service limit of the clearance between each piston and
the master cylinder inner dia. is 0.11 mm (0.0043 in).
c. When handling parts, be extremely careful not to damage or
scratch the parts, or let any foreign matter get on them.
37
After assembling, ensure that the Coring is fitted securely in
the ring groove.
INSTALLATION
To install the master cylinder to the body, reverse the
sequence of removal procedure.
Tightening torque:
Master cylinder mounting nut
10 - 18 N·m (1.0 - 1.8 kg-m, 7 - 13 ft-Ib)
Piping flare nut
13 - 18 N'm (1.3 - 1.8 kg-m, 9 - 13 ft-Ib)
Be sure to use recommended brake fluid.
Brake Booster
REMOVAL
1) Remove the following parts at engine compartment.
(1) Disconnect connector for brake fluid level indicator.
(2) Remove brake pipes from master cylinder.
(3) Remove master cylinder installing nuts.
(4) Disconnect vacuum hose from brake booster.
2) Remove the following parts from the pedal bracket.
(1) Snap pin and clevis pin.
(2) Four brake booster installing nuts.
3) Remove brake booster while shunning brake pipes.