Bench Bleeding Procedure - Mazda B-Series 1997 Workshop Manual

CLUTCH FLUID
BLEED
COMPACT TRUCK BENCH
BLEED
PROCEDURE
REMOVE CAP AND DIAPHRAM
TO FILL
IN AN UPRIGHT POSITION,
OPEN COUPLING
STROKE BY HAND
13. Loosen the bleed screw (located in the clutch release
cylinder body next to the inlet connection).
14. Depress and hold the clutch pedal while tightening the
bleed screw.
Tightening torque:
3-5 N-m ( 0 . 3 - 0 . 5 kgf-m, 2.2-3.7 ft-lbf}
15. Refill reservoir to the step.
16. Check the operation of the clutch system.
Bench Bleeding Procedure
I
Note
When installing dry clutch master cylinder or tube
service parts, do the Bench Bleed Procedure first.
If air is entrapped in the clutch hydraulic system, a
"soft" unresponsive clutch pedal may be felt or the
clutch may be unable to release.
The truck is more difficult to bleed because the
downward angle of the master cylinder makes it
difficult for air to escape up into the reservoir. If the
master cylinder is removed from the vehicle and
bled while held in vertical orientation (a bench
bleed) air can escape much more efficiently.
1. Hold the master cylinder vertically with the reservoir feed
hose in the highest position on the body.
2. Fill the reservoir and extend above the master cylinder
and assure the quick connect on the clutch line is below
the master cylinder (lightly clamp reservoir in a vise).
3. Using a small screwdriver, depress the internal mecha-
nism of the male quick connect pipe to open the valve.
4. Stroke and hold the master cylinder pushrod.
5. Close quick connect valve.
6. Release master cylinder pushrod.
7. Fill reservoir.
8.
Repeat Steps
3
and
7
four more times.
9. With the master cylinder still being held with theoutlet tube
and reservoir feed tube ends high, quick connect closed
and the reservoir full, proceed as follows:
(a) Quickly push the pushrod into the body several times
to remove any remaining air.
(b) If it is a remote reservoir, pinch the supply hose with
your fingers two or three times to help move air into
reservoir.
10. When the movement of the pushrod is 4mm (0.160 in) or
less when stroked in Step 9, reinstall the master cylinder
into the vehicle and couple it to the slave cylinder.