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Bleeding
Hydraulics The degree of
difficulty in bleeding a hydraulic system often depends on the angle at which
the hydraulic components are mounted. We offer a line of reverse fluid injection
bleeder tools. With
one tool, one technician can bleed the hydraulic system quickly and
efficiently.
For slave cylinders without bleed screws to purge air, follow the
procedures below for proper bleeding. If the slave cylinder has a gold allen
screw, do not remove or loosen it. The screw set is not designed for
bleeding.
- Push the slave cylinder pushrod inward and disconnect both bands of the
retaining strap to enable the pushrod to fully extend. Do not cut or discard
the retaining strap.
- Tilt the slave cylinder at a 45-degree angle. The master cylinder line
port should be facing upward with the port at the high end of the slave. Fill
the slave cylinder with fresh, clean brake fluid.
- Insert the master cylinder line into the slave cylinder port. Lubricate
the enclosed o-ring with brake fluid and insert the retaining pin.
- Hold the slave cylinder vertically with the pushrod facing the ground.
If this is not possible due to the master cylinder line, position the slave as
far vertically as possible without putting excessive load on the master
cylinder line. The slave cylinder must be lower than the master cylinder.
- Remove the master cylinder reservoir cap.
- Slowly push the slave cylinder pushrod into the slave approximately one
inch, watching for air bubbles in the master cylinder reservoir. Air in the
release system should be purged after 10 to 15 strokes of the slave cylinder
pushrod.
- After all air is purged from the system, slowly push the slave cylinder
pushrod back into the slave and reconnect the two bands of the retaining
strap.
- Install the slave cylinder with the retaining strap in place. The
retaining strap will break free with the first stroke of the pedal.
Note: The plastic cover over the end of the pushrod must be
retained; it acts as a lubricant between the pushrod and the fork. Removing the
cover can cause a no release condition.
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