power steering fluid NISSAN PULSAR 1987 User Guide

178 Brakes

Let the vehicle stand for 1-2 minutes, press the
brake pedal two or three times and check its opera-
tion.

If there is no vacuum assistance, the vacuum
system has developed a leak or the one way check
valve is defective.

NOTE: Before removing the servo unit from
the vehicle for inspection, disconnect the
hose from the servo unit, start the engine
and check that the manifold vacuum is in
fact reaching the servo unit. Also test the one
way check valve as described below,

TO TEST ONE WAY CHECK VALVE
(1) Disconnect the hose and remove the check
valve from the servo unit.

(2) Check the valve for sticking. Suction on the
manifold side should allo w air to flow freely. Air
blown into the valve from the manifold side should
not be able to flow through the valve. (3) Install the valve and check the operation
of
the servo unit as previously described.
NOTE: Check that there are no air leaks at
the hose connections and that the hose clips
are tight. Also check that the hose is not
bulged or collapsed due to deterioration.


Checking for vacuum at the servo unit. The engine
must be running for this test.
TO REMOVE
(1) Raise the bonnet and install covers to both
front mudguards.

(2) On 1.6 liter models, remove the air cleaner
assembly from the vehicle. If necessary refer to the
Fuel System section.
(3) On vehicles equipped with power steering,
remove the reservoir from the bulkhead and move it
to one side. If necessary refer to the Steering section.
(4) Disconnect the vacuum supply hose from the
servo unit.

View of the brake servo unit and associated compo-
nents.
(5) Remove the master cylinder as described
under the Master Cylinder heading. (6) Working inside the vehicle, remove the clip
and clevis pin connecting the pushrod to the brake
pedal. (7) Remove the nuts retaining the servo unit to
the bulkhead and maneuver the servo unit and
spacer block from the vehicle.
TO INSTAL

Installation is a reversal of the removal procedure
with attention to the following points:

(1) With the servo unit and master cylinder
installed to the vehicle, bleed the hydraulic system as
described under the Hydr aulic System heading.
(2) Check and if necessary adjust the brake
pedal height and free play as described under the
Brake Pedal heading.
5. FRONT BRAKES
Special Equipment Required:
To Check Disc Runout — Dial gauge
To Check Disc Thickness — Micrometer

TO CHECK AND RENEW BRAKE PADS
(1) Raise the front of the vehicle and place it on
chassis stands. Remove the front wheels.

(2) Inspect the brake pads on both sides of the
vehicle. If the friction material on one or more of the
pads is less than 2 mm thick or contaminated with
fluid or grease, renew the brake pads as a set as
follows.
NOTE: If the brake pads are contaminated,
trace and rectify the cause prior to installing
the new set of pads.

(3) Drain approximately two thirds of the brake
fluid from the master cylinde r reservoir. This can be
done by loosening the bleeder valve on the caliper and
allowing the fluid to drai n into a container. Discard
this fluid.