Yamaha XZ550RJ 1982 Service Manual page 120

6. If the brake disc has been removed from the
hub or is loose, tighten the bolts. Use new
lock plates, and bend the lock tabs against a
bolt flat after the bolts are torqued to specifi-
cation.
Tightening torque:
20 Nm (2.0 m-kg, 14.5 ft-lb)
7. Reassemble the master cylinder as shown in
the illustration.
Tightening torque:
(all brake union bolts)
26 Nm (2.6 m-kg, 19 ft-lb)
Bleeding the brakes
WARNING:
If the brake system is disassembled or if any
brake hose has been loosened or removed, the
brake system must be bled to remove air from
the brake fluid. If the brake fluid level is very low
or brake operation is incorrect, bleed the brake
system. Failure to bleed the brake system prop-
erly can result in a dangerous loss of braking
performance.
1. Add proper brake fluid to the reservoir. In-
stall the diaphragm, being careful not to spill
or overflow the reservoir.
2. Connect a clear plastic tube, 4.5mm (3/16 in)
inside diameter, tightly to the caliper bleed
screw. Put the other end of the tube into a
container.
3. Slowly apply the brake lever several times.
Pull in the lever. Hold the lever in this "on"
position. Loosen the bleed screw. Allow the
lever to travel slowly toward its limit. When
the limit is reached, tighten the bleed screw.
Then release the lever.
Bleed screw tightening torque:
6 Nm (0.6 m-kg, 4.3 ft-lb)
4. Repeat the above procedure until all air
bubbles are removed from the system.
NOTE:
If bleeding is difficult, it may be necessary to let the
brake fluid system stabilize for a few hours. Repeat
the bleeding procedure when the tiny bubbles in the
system have settled out.
120