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928
Brakes/Hydraulic
Parts
(Regulators,
Booster)
47
INSPECTING BRAKING-FORCE REGULATOR
General
A braking-force
regulator
is inte-
grated
in the brake
lines
to the
left-hand
and right-hand
rear
wheels
(diagonal
braking
circuits).
This
version
was retained
until
the
end of model year
1983.
From model
year
1984
onward,
only
one braking-
force
regulator
is installed
for
both
rear
wheels
(separate
braking
circuits
for
each axle).
This
regu-
lator
is smaller
and lighter.
It is
screwed
directly
into
the modified
master
cylinder
or into
the
hydraulic
unit
of vehicles
with
ABS
(screw-in
regulator).
The braking-force
regulators
have a
permanently
set switchover
pressure
of 18, 33 or 55 bar (see overview,
page 47 - 18a/18b).
Until
pressure
rises
to the switchover
point,
the
same overpressure
is applied
to the
input
and output
sides
of the
braking-force
regulator.
As the
pressure
on the input
side
rises
further,
the output
overpressure
(rear-axle
overpressure)
is
reduced.
To check the braking-force
regu-
lators
of diagonally-split
braking
circuits,
the pressure
which
is not
reduced
(front
axle)
and the re-
duced pressure
(rear
axle)
must be
read simultaneously
on manometers
installed
independently
in the
separate
circuits.
To check the braking-force
regu-
lator
(screw-in
regulator)
of
brakes
with
separate
circuits
for
each axle,
the pressure
which
is
not reduced
(front
axle)
and the
reduced
pressure
(rear
axle)
must
be read simultaneously
on indepen-
dent manometers
in the separate
circuits.
Preparation
l.Connect
brake
calipers
concerned
and pressure
tester
by screwing
test
adapters
into
holes
for
bleeder
valves
in brake
calipers.
Diagonally-split
Brake
Circuits
Test
connections
for
braking-force
regulator
of left-hand
rear
wheel:
on the left
behind
and on the right
in front
of the right-hand
rear
wheel:
rear
right
and front
left
Separate
Braking
Circuits
for
Each
A x 1 e
(84 models
onward)
Test
connections
for
the screw-in
regulator:
front
axle
left
or right
and
rear
axle
left
or right.
a
Printed
in Germany
- XIII,
1986
Testing
Braking-Force
Regulator
47 -
19
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