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Periodic maintenance and adjustment
95
7. Tighten the parking brake pad adjusting
bolt locknut.
8. Install the right side cover and the shroud
(RS90P / RS90PLT / RST90PGT), or
close the shroud (RST90).
Checking the brake fluid level
Before riding, check that the brake fluid is
above the lower level. Check the brake fluid
level with the top of the reservoir level. Re-
plenish the brake fluid if necessary.
WARNING
EWS00820
Improper maintenance can result in loss
of braking ability. Observe these precau-
tions:
● Insufficient brake fluid may allow air to
enter the brake system, reducing brak-
ing performance.
● Clean the filler cap before removing. Use
only DOT 4 brake fluid from a sealed
container.
● Use only the specified brake fluid; other-
wise, the rubber seals may deteriorate,
causing leakage.
● Refill with the same type of brake fluid.
Adding a brake fluid other than DOT 4
may result in a harmful chemical reac-
tion.
● Be careful that water does not enter the
brake fluid reservoir when refilling. Wa-
ter will significantly lower the boiling
point of the fluid and may result in vapor
lock.
NOTICE
ECS01050
Brake fluid may damage painted surfaces
or plastic parts. Always clean up spilled
fluid immediately.
As the brake pads wear, it is normal for the
brake fluid level to gradually go down. A low
brake fluid level may indicate worn brake
pads and/or brake system leakage; therefore,
be sure to check the brake pads for wear and
the brake system for leakage. If the brake fluid
level goes down suddenly, have a Yamaha
dealer check the cause before further riding.
Changing the brake fluid
WARNING
EWS00471
Make sure that the brake fluid and the fol-
lowing parts are replaced by a Yamaha
dealer.
Brake fluid replacement is necessary when
the following components are replaced during
the periodic maintenance or if they are dam-
aged or leaking.
● All oil seals of the master cylinder and cali-
per cylinder
● The brake hose
ESU14270
Extrovert drive sprocket
(RS90P / RS90PLT / RST90PGT)
Check the extrovert drive sprocket for wear
and damage. Replace if necessary.
Parking brake pad to brake disc clear-
ance (a) + (b):
1.5–2.0 mm (0.059–0.079 in)
1. Lower level
Specified brake fluid:
DOT 4
U8HV10E0.book Page 95 Monday, May 16, 2011 1:15 PM