Yamaha MM700A, Manual, Page: 216 / 282

210 CHAPTER ELEVEN
2. Inspect the hand lever pivot hole. If worn or elongated,
replace the lever.
Check the hand lever pivot lugs on the master cylinder
body for cracks or elongation. If damaged, replace the
master cylinder assembly.
4. Make sure the passage (Figure 22) in the bottom of the
body reservoir is clear. Clean out with brake fluid. Then
apply compressed air to make sure
passage is clear.
5. Check the reservoir and diaphragm for damage
and deterioration and replace as necessary.
6.
Inspect the threads for the brake hose fitting in the
body. If worn or damaged, clean out with a suitable size
metric thread tap or replace the master cylinder assembly.
7. Inspect the fluid viewing port for signs of hydraulic
fluid leakage. If leakage has occurred, replace the master
cylinder assembly.
8. Inspect the piston contact surfaces for wear and
age. If less than perfect, replace the piston assembly.
9. Check the end of the piston for wear caused by the
hand lever. If worn, replace the piston assembly.
10. Inspect the piston cups for wear or damage. Cups are
not available separately and must be replaced along with
the new piston and spring as an assembly.
11. Inspect the cylinder bore surface for wear and dam-
age. If less than perfect, replace the master cylinder as-
sembly. Individual components are not available.
Assembly
1. Soak the new, or existing, piston assembly in fresh
brake fluid for at least
15 minutes to make the cups pli-
able. Coat the inside of the cylinder bore with fresh brake
fluid before assembling the parts.
When installing the piston assembly, do not
allow the
cups to
turn inside out. This prob-
lem damages the cups and allows brake
fluid within the cylinder bore.
2. Position the spring and primary cup as shown (Figure
21). The cup side fits over the small end of the spring. In-
stall the spring, cup and piston assembly (Figure 20) into
the cylinder bore.
3.
Push piston assembly into the bore and hold it in
place. Install the sanp ring (Figure 19) and make sure it
seats correctly in the master cylinder body groove.
4. Install the rubber boot (Figure 18) and push it all the
way down until it stops.
5. Install the brake lever onto the master cylinder body.
but do not tighten the retaining nut. The nut will be
the master cylinder and the brake switch are
installed.
Install the diaphragm and cover. Do not tighten the
cover screws at this time in order to add fluid later.
Install the cylinder as described in this chapter.
PARKING BRAKE
The caliper type parking brake is
mounted on the chaincase (Figure 23). A separate