9. Inspect the threads in the bore for the banjo bolt. If they
are worn or damaged, clean them out with a thread tap or re-
place the master cylinder assembly.
10. Check the top cover and diaphragm for damage or de-
terioration.
11. If necessary, separate the cover from the diaphragm
as follows:
a. Pull straight up on the sight glass (Figure 92) and
remove it from the cover and diaphragm.
b. Separate the diaphragm from the cover.
c. The trim plate may separate from the cover.
Assembly
NOTE
When installing a new piston assembly, coat
all parts with the lubricant provided with
the Harley-Davidson parts kit. When in-
stalling existing parts, coat them with DOT
5 brake fluid.
NOTE
Make sure the new piston kit is for a single
front disc motorcycle.
CAUTION
The cover and diaphragm must be assem-
bled as described. If the sight glass is not in-
BRAKES
501
13
87
88
89
90
91
92