Vehicles before change point in 1982
CHECKING SERVICE BRAKE WITH HIGH
AND LOW PRESSURE TESTS
High Pressure Leak Test:
Remove and install front wheel - 36 10 300.
Make test on both brake circuits.
Unscrew vent plug of 1st brake circuit (A).
Connect tester and bleed.
2nd brake circuit (B).


Siehe auch 36 10 300
63034011 - click to zoom
 
Build up pressure¹) in brake system by
pumping brake pedal and hold brake pedal
down with a pedal prop.
After 1 minute pressure must not drop by
more than 10%.
Carry out same test on 2nd brake circuit (B).
Important: High pressure test must be
performed once while engine is not running
and once with engine running.


Siehe auch ¹) See Specifications
63034012 - click to zoom
 
Low Pressure Test:
Make test on both brake circuits.
Shorten pedal prop until testing pressure in
brake system is 2 to 5 bar (30 to 70 psi). Car
and tester must stand still, since any
movement would cause incorrect readings.
Pressure must remain constant during testing
time of 5 minutes.
Check all rubber parts, if pressure drops
seriously.
Bleed caliper after completion of testing.

63034013 - click to zoom
 
Vehicles after change point in 1982
CHECKING SERVICE BRAKE
WITH HIGH AND LOW PRESSURE
TESTS
High Pressure Leak Test:
High Pressure Leak Test:
Discharge hydraulic reservoir by operating brake
pedal about 20 times with same force required
for full stop braking action with engine stopped.
Check both brake circuits.
1. Front right and rear left brake circuit.
2. Front left and rear right brake circuit.
Unscrew bleeder screw of 2nd brake circuit.
Connect pressure tester and bleed.

63034154 - click to zoom
 
Apply a force* on brake pedal.
This should cause hydr. line pressure of service
brakes to show pressure value*.
Pressure must not have dropped by more then
8% after 2 minutes.
Repeat test on 1st brake circuit.
Caution!
Engine must be stopped for high pressure leak
tests.


Siehe auch * See Specifications
73034012 - click to zoom
 
Low Pressure Test:
Check both brake circuits.
Release pedal prop that brake system has test
pressure of 2 to 5 bar (28 to 71 psi).
Car and tester must remain motionless.
Motion could cause incorrect readings.
Pressure should remain constant during 5 minute
test.
Check all rubber parts, if pressure drops
considerably.
Bleed brake calipers after finishing test.

73034013 - click to zoom