Volkswagen Type II Transporter 1200 Series Shop Manual page 180

2-~rakes
FROM CHASSIS No 217019488
As above with the exception of the master cylinder.
Master cylinder:
Type . . . . . . . . . . . . . . . . Tandem
Front wheel circuit stroke . . .748"
Rear wheel circuit stroke . . . .511"
Diameter . . . . . . . . . . . . . . .874"
FROM CHASSIS No 218000001
As above with the exception of the master cylinder.
Master cylinder:
Front wheel circuit stroke . . .944"
Rear wheel circuit stroke . . . .5 51 "
TORQUE WRENCH SETTING
Brake hose/line to wheel cylinder union
Back plate securing bolts/nuts ........... .
12 ft/lb
42 ft/lb
Front wheel cylinders connecting pipe unions
Wheel cylinder securing bolts ........... .
18 ft/lb
40 ft/lb
I.
DESCRIPTION
Hydraulically operated drum brakes are fitted to all
models, with two leading shoe type brakes on the front
wheels, and leading and trailing shoe type on the rear
wheels.
The front brakes have a separate wheel cylinder for
each shoe, while the rear wheel shoes are operated by a
single cylinder fitted with two opposed pistons.
Adjustment for each of the front brake shoes is
effected by a toothed adjusting nut located on a screw at
the end of each wheel cylinder. The adjuster for each rear
brake shoe, also of the toothed adjusting nut type, is
located in a block anchored to the back plate opposite the
wheel cylinder. Access to the adjusters is gained by a
drilling in each of the brake drums through which a
screwdriver can be inserted to rotate the toothed adjusting
nut.
The handbrake is connected to each rear wheel
assembly by cable, the cable is attached to and operates a
pivotted lever linked to the leading shoe of each assembly.
A push bar is interposed between the leading shoe and lever
at one end and the trailing shoe at the opposite end,
movement of the lever is transmitted through the push bar
to the trailing shoe.
The hydraulic system consists of a master cylinder and
a fluid reservoir, andhydraulic lines and hoses which carry
the pressure generated in the. master cylinder to each of the
wheel cylinders. The master cylinder is attached to the
frame beneath the vehicle floor and is connected by push
rod to the brake pedal lever. A bleeder valve for each wheel
assembly is located at the rear of the brake back plates.
Application of the brake pedal forces the piston into
the master cylinder by means of the push rod, the pressure
generated is fed equally to each of the wheel cylinders and
remains constant with the pedal pressure. The hydraulic
fluid pressure compels the pistons in each wheel cylinder to
move outwards causing the brake shoes to contact the
drum. On release of the pedal pressure, the fluid returns to
the master cylinder by pressure created at the brake shoe
return springs which pull the shoes from the drum and
return the wheel cylinder pistons to the off position.
From Chassis No 1144303 a heavy duty braking
system is fitted to all models. Although of basically similar
design to models prior to that Chassis number, the heavy
duty
syst~m
involves an increase in size of master cylinder
stroke, brake drum and linings etc, (refer to Specifications).
The heavy duty braking system cannot be installed to
models with the normal system unless modifications are
carried out to front and rear axles.
From Chassis No 217019488 a dual circuit hydraulic
system is fitted, operated by a tandem type master
cylinder. The master cylinder is fitted with two piston and
spring assemblies, one assembly operating the front brakes
whilst the other operates the rear brakes. In the event of a
fault or failure in one of the circuits, the remaining circuit
will continue to operate although there will be an obvious
increase in brake pedal travel. ·
2. MASTER CYLINDER
TO REMOVE AND INSTAL (Single Circuit)
(1) Raise the vehicle on a lift or place over a pit.
(2) Remove the cover plate located under the pedal
linkage.
180
(3) Take out the split pin and remove the push rod
clevis pin and washer attaching the push rod to the brake
pedal lever.
(4) Disconnect the stop lamp wires at the stop lamp
switch located on the end of the master cylinder.