Checking The Brake Fluid Level - Yamaha YZF R1 2021 Owner's Manual

Periodic maintenance and adjustment

Checking the brake fluid level

Before riding, check that the brake fluid
is above the minimum level mark.
TIP
Make sure the reservoir is parallel to
the ground when checking.
Specified brake fluid:
DOT 4
NOTICE
Brake fluid may damage painted
surfaces or plastic parts. Always
clean up spilled fluid immediately.
8
Front brake
UPPER
LOWER
1. Minimum level mark
Rear brake
EAU22584
1. Minimum level mark
ECA17641
As the brake pads wear, it is normal for
the brake fluid level to gradually go
down.
 A low brake fluid level may indi-
cate worn brake pads 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
1 check the cause before further rid-
ing.
WARNING
Improper maintenance can result in
loss of braking ability. Observe
these precautions:
UPPER
1
LOWER
EWA15991
8-26
 Insufficient brake fluid may al-
low air to enter the brake sys-
tem, reducing
performance.
 Clean the filler cap before re-
moving. Use only DOT 4 brake
fluid from a sealed container.
 Use only the specified brake flu-
id; otherwise, the rubber seals
may deteriorate, causing leak-
age.
 Refill with the same type of
brake fluid. Adding a brake fluid
other than DOT 4 may result in a
harmful chemical reaction.
 Be careful that water does not
enter the brake fluid reservoir
when refilling. Water will signifi-
cantly lower the boiling point of
the fluid and may result in vapor
lock.
braking