Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual page 237

928
Brakes/Hydraulics, Regulator, Booster
47
0
REMOVING AND INSTALLING BRAKE MASTER CYLINDER
Removing
a
1. Remove intake hoses and air cleaner upper
section.
2. Drain both chambers of brake fluid reser-
voir by pumping out brake fluid via
pertinent bleeder screws depending on brake
circuit division.
Diagonal brake circuit division up to 1983
models. Axla brake circuit division since
1984 models.
Identification: stepped master cylinder and
screw-in brake pressure regulator (see
point 5).
3. Detach vacuum hose with check valve at
brake booster.
Pull off vacuum line on branch, plug for
warning device and hose for clutch control.
mm:< .;
..- k[ &:,,--.;I'e
'* ',,
4. Pull brake fluid reservoir out of master
cylinder from above. If applicable, pull off
plugs on hydraulic stop light switches.
5. Detach brake lines.
Up to 1983 models.
Since 1984 models
Note:
Counterhold on hexagon of regulator when
unscrewing rear axle brake line on screw-in
brake pressure regulator. Screw-in regulator
of cars with ABS is installed on hydraulic
unit.
Printed in Germany - VIII, 1984
Removing and Installing Brake Master Cylinder
47-13