Removal And Installation Of Master Cylinders; Disassembly, Repair, And Assembly Of Master Cylinders - Cessna SKYMASTER 336 1964 Service Manual

ISOLATION PROCEDURE
DRAGGING BRAKE. (Cont)
Restriction in hydraulic lines or
restricted passages in compen-
sating sleeve in master cylinder.
Warped or badly scored brake
disc.
Damage or accumulated dirt
restricting free movement of
wheel brake parts.
Jack wheel, operate brake and
release. If wheel does not ro-
tate, loosen brake line at wheel
to relieve any trapped pressure.
If wheel now turns freely, hy-
draulic lines are restricted or
the master cylinder is faulty.
Jack wheel and check disc as
wheel is rotated.
Check brake parts for freedom
of movement.
Clean out restrictions.
Flush
brake system with denatured alcohol.
Repair or replace master cylinder.
Replace brake disc and linings.
Clean and repair or replace brake
parts as necessary.
BRAKE FAILS TO OPERATE.
Insufficient fluid in master cylin-
der or air trapped in brake
system.
Worn or damaged O-ring seal
in master cylinder or wheel
brake cylinder.
Worn or damaged Lock-O-Seal
in master cylinder.
Too much clearance between
Lock-O-Seal and piston in
master cylinder.
Pressure leak in brake system.
Brake linings worn out.
Oil, grease, or other foreign
material on brake linings, or
new linings just installed.
Brakes too hot from extensive
use.
Internally swollen hoses and/or
swollen O-rings due to use of
wrong kind of hydraulic fluid
in brake system.
Check fluid level.
Check O-rings.
Check Lock-O-Seal.
See figure 5-10.
Visually check for external
leakage with pressure on brake
pedal.
Check per paragraph 5-37.
Check brake linings.
Allow time for brakes to cool.
Check hydraulic fluid.
Fill and bleed brakes.
Replace O-rings.
Replace Lock-O-Seal.
Adjust per figure 5-10.
Tighten loose connections; repair
or replace defective parts.
Replace brake linings.
Clean linings with carbon tetra-
chloride, then taxi the aircraft slowly,
applying the brakes several times to
condition the linings. New linings
must also be conditioned.
Check that pistons are free after over-
heating brakes.
Replace hoses and O-rings. Flush
system with denatured alcohol. Fill
and bleed with proper fluid.
5-32. REMOVAL AND INSTALLATION OF MASTER
CYLINDERS. Figure 5-9 may be used as a guide
during removal and installation of master cylinders.
Drain hydraulic fluid before removal, and fill and
bleed brake system after installation.
5-33. DISASSEMBLY, REPAIR, AND ASSEMBLY
OF MASTER CYLINDERS. Figure 5-10 may be used
as a guide during disassembly and assembly. Repair
is limited to replacement of parts, cleaning, and ad-
justment. Use clean hydraulic fluid as a lubricant
during assembly.
5-19
PROBABLE CAUSE
REMEDY