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15.7 Four nuts (arrowed) which hold the
hydraulic unit to the bulkhead
fluid. Identify the hydraulic pipes and
disconnect them from the base of the unit.
Hint: Plug or cap the open unions to keep
fluid in and dirt out.
6 Remove the under-dash trim on the driver's
side. Disconnect the spring clip which secures
the hydraulic unit pushrod to the brake pedal.
7 Have an assistant support the hydraulic
unit. Remove the four nuts which hold the unit
to the bulkhead (see illustration). Withdraw
the unit from under the bonnet.
8 Recover the sealing compound from the
unit and the bulkhead.
9 Drain the hydraulic fluid from the reservoir.
Do not actuate the pushrod with the unit
removed.
10 Dismantling of the hydraulic unit should be
limited to the operations described in the
16.4 Undoing the reservoir securing screw
16.6 Removing the hydraulic fluid reservoir
following Sections. These operations can all
be carried out without removing the unit from
the vehicle if wished.
11 Refit by reversing the removal operations,
noting the following points:
a) Do not refill the reservoir until the end of
refitting
b) Use new sealing compound between the
unit and the bulkhead
c) Make sure that the hydraulic pipes are
reconnected to the correct unions
d) Bleed the complete hydraulic system on
completion - see Section 2
16 Hydraulic unit fluid reservoir -
removal and refitting
1 Disconnect the battery negative lead.
2 Depressurise the hydraulic system by
pumping the brake pedal at least 20 times, or
until it becomes hard.
3 Disconnect the multi-plugs and remove the
reservoir cap.
4 Remove the reservoir securing screw, which
is located just above the valve block multi-
plug (see illustration).
5 Make arrangements to catch spilt fluid, then
disconnect the low pressure hose from its
connections to the pump. The hose is secured
by a spring clip (see illustrations). Allow the
brake fluid to drain out of the hose.
6 Pull the reservoir out of the seals on the
hydraulic unit and remove it (see illustration).
16.5a Extract the spring clip . . .
16.7 The spigot locating bush fits into this
union
Braking system 10•9
7 Note the spigot locating bush on the rear
inlet union, which may stay in the hydraulic
unit or may come out with the reservoir (see
illustration).
8 Refit by reversing the removal operations.
Use new seals between the hydraulic unit and
the reservoir.
9 Bleed the complete hydraulic system on
completion (Section 2). Check for leaks
around the disturbed components.
17 Hydraulic unit accumulator -
removal and refitting
1 Disconnect the battery negative lead.
2 Depressurise the hydraulic system by
pumping the brake pedal at least 20 times, or
until it becomes hard.
3 Wrap a clean rag round the base of the
accumulator to catch any spilt fluid.
4 Unscrew the accumulator using a hexagon
key. Remove the accumulator, being prepared
for fluid spillage (see illustration).
5 When refitting, fit a new O-ring to the base
of the accumulator. Fit the accumulator and
tighten it.
6 Reconnect the battery. Switch on the
ignition and check that the hydraulic unit
pump stops within 60 seconds. If not, there
may
be
something
wrong
accumulator.
7 Bleed the complete hydraulic system as
described in Section 2.
16.5b . . . and disconnect the hose
17.4 Removing the accumulator
Note O-ring (arrowed)
with
the
10
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