DS 19 OPERATION No. DS 00 : Work on the hydraulic system. Op. DS 00 28
TOOLS
For correct functioning of all the hydraulic system, it is essential that the fluid and the units of the hydraulic
system should be perfectly clean. The strictest precautions must be observed during work on the car and
for storage of the fluid and spare parts.
1 STORAGE
Pipes, units and spare parts must be protected from exposure to dust and from impact. Seals and rubber pipes
must be protected from exposure to dust, air, light or heat.
The fluid must be kept in its original container, securely sealed. We recommend the use of 1 quart (1 litre)
containers (for topping up) or 1 gallon (5 litres) (in the case of draining or refilling) in order to avoid
keeping many small containers.
2 PRECAUTIONS DURING WORK
Before starting work, carefully wash the car or round the area in which the work is to be carried out.
Example : When replacing a rear suspension cylinder, carefully wash the corresponding wheel arch.
Before disconnecting a union, carefully wash it and the surrounding area with alcohol.
Then proceed as follows:-
a) Work on all the units except brakes and brake control :
1. Remove the spare wheel.
2. Unscrew the bleed screw on the pressure regulator.
3. Move the manual height control lever to the low position
b) Work on the brake system :
1. Carry out all the operations mentioned in the preceding paragraph.
2. Connect a flexible pipe (plastic or rubber) on the front brake bleed pipe, on the accelerated idling
hydraulic control. Connect also a pipe on the rear brake cylinder bleed screw and press on the
hydraulic brake pedal until the fluid ceases to flow.
3. If the union is situated below the level of the fluid in the reservoir, drain the latter in order to avoid a
loss of fluid, or immediately close the pipe with the appropriate plug.
3 PRECAUTIONS AFTER DISCONNECTING THE UNIONS
Seal the open ends of pipes with caps.
1. Metal pipes with screwed unions :
3.5 mm dia. cap . . . . . . . . . . . . . . . . . . . . . . . . . . . D 435-91
4.5 mm dia. cap . . . . . . . . . . . . . . . . . . . . . . . . . . . D 453-131
6.35 mm dia. cap . . . . . . . . . . . . . . . . . . . . . . . . . . . D 453-132
8 mm dia. cap . . . . . . . . . . . . . . . . . . . . . . . . . . . D 391-60
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