30 - 3
Section G Brakes
9803/3280
Section G
30 - 3
Issue 1
Master Cylinder and Servo Unit
S151280
Dismantling and Assembly
Note 1: The servo unit (not shown) is a non serviceable part.
A faulty servo unit must be replaced with a new one.
Note 2: Seal kits are no longer available for the master
cylinders, the only servicing permitted is a major repair kit
which comprises of a full piston assembly. A faulty master
cylinder and piston assembly must be replaced with new
ones.
Dismantling
1 Remove circlip 1 and washer 2.
2 Shake the cylinder body, or use compressed air, to
eject piston assembly 3. Take care not to damage the
piston assembly or the bore of the cylinder body.
3 Examine the working surfaces of piston and cylinder. If
these are not in perfect condition the master cylinder
assembly must be renewed. The piston assembly 3
cannot be dismantled. If it is damaged (including seal 5),
the complete piston/seal assembly must be renewed,
see Note 2:
Assembly
!
WARNING
Use of incorrect fluid will cause serious damage to the
seals which could in turn cause brake failure.
BRAK 1-1
1 Clean and lubricate all components, including new
seals, with JCB Special Hydraulic Fluid. DO NOT USE
CONVENTIONAL BRAKE FLUID OR SERIOUS
DAMAGE WILL BE CAUSED.
2 Take care not to damage the machined faces of piston
assembly 3 when assembling.
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