Introduction; Checking The Rear Brake Disc; Replacing The Rear Brake Pads - Yamaha YZF-R1 2020 Service Manual

EAS30183

INTRODUCTION

EWA14101
WARNING
Disc brake components rarely require disas-
sembly. Therefore, always follow these pre-
ventive measures:
• Never disassemble brake components un-
less absolutely necessary.
• If any connection on the hydraulic brake
system is disconnected, the entire brake
system must be disassembled, drained,
cleaned, properly filled, and bled after reas-
sembly.
• Never use solvents on internal brake com-
ponents.
• Use only clean or new brake fluid for clean-
ing brake components.
• Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean
up any spilt brake fluid immediately.
• Avoid brake fluid coming into contact with
the eyes as it can cause serious injury.
FIRST AID FOR BRAKE FLUID ENTERING
THE EYES:
• Flush with water for 15 minutes and get im-
mediate medical attention.
EAS30184

CHECKING THE REAR BRAKE DISC

1. Check:
• Rear brake disc
Damage/galling → Replace.
2. Measure:
• Brake disc runout
Out of specification → Correct the brake disc
runout or replace the brake disc.
Refer to "CHECKING THE FRONT BRAKE
DISCS" on page 4-57.
Brake disc runout limit (as mea-
sured on wheel)
0.15 mm (0.0059 in)
3. Measure:
• Brake disc thickness
Measure the brake disc thickness at a few dif-
ferent locations.
Out of specification → Replace.
Refer to "CHECKING THE FRONT BRAKE
DISCS" on page 4-57.
Brake disc thickness limit
4.5 mm (0.18 in)
4. Adjust:
• Brake disc runout
Refer to "CHECKING THE FRONT BRAKE
DISCS" on page 4-57.
Rear brake disc bolt
27 N·m (2.7 kgf·m, 20 lb·ft)
LOCTITE®
EAS30185

REPLACING THE REAR BRAKE PADS

TIP
When replacing the brake pads, it is not neces-
sary to disconnect the brake hose or disassem-
ble the brake caliper.
1. Measure:
• Brake pad wear limit "a"
Out of specification → Replace the brake
pads as a set.
Brake pad lining thickness limit
0.5 mm (0.02 in)
a
2. Install:
• Brake pad insulators
• Brake pad shims
(onto the brake pads)
• Brake pad spring
(into the rear brake caliper)
• Brake pads
TIP
Always install new brake pads, brake pad insu-
lators, brake pad shims, and brake pad spring as
a set.
a. Connect a clear plastic hose "1" tightly to
the bleed screw "2". Put the other end of
the hose into an open container.
b. Loosen the bleed screw and push the
brake caliper piston into the brake caliper
with your finger.
4-68
REAR BRAKE