Yamaha YP125R Service Manual

REAR BRAKE
4-41
2. Check:
• Brake caliper bracket
Cracks/damage → Replace.
EAS22650
ASSEMBLING THE REAR BRAKE CALIPER
WARNING
EWA37P1015
• Before installation, all internal brake com-
ponents should be cleaned and lubricated
with clean or new brake fluid.
• Never use solvents on internal brake com-
ponents as they will cause the brake caliper
piston dust seals and brake caliper piston
seals to swell and distort (YP250R only).
• Whenever a brake caliper is disassembled,
replace the brake caliper piston dust seals
and brake caliper piston seals (YP250R
only).
EAS37P1133
INSTALLING THE REAR BRAKE CALIPER
(YP125R)
1. Install:
• Rear brake caliper “1”
(temporarily)
• Copper washers “2”
• Rear brake hose “3”
• Brake hose union bolt “4”
WARNING
EWA37P1025
Proper brake hose routing is essential to in-
sure safe vehicle operation. Refer to “CABLE
ROUTING (YP125R)” on page 2-29.
NOTICE
ECA37P1051
While holding the brake hose, tighten the
union bolt within the angle range shown in
the illustration.
2. Remove:
• Rear brake caliper
3. Install:
• Brake pad spring
• Brake pads
• Brake pad pin
• Brake pad clip
• Rear brake caliper
Refer to “REPLACING THE REAR BRAKE
PADS (YP125R)” on page 4-37.
4. Fill:
• Brake master cylinder reservoir
(with the specified amount of the recom-
mended brake fluid)
WARNING
EWA13540
• Use only the designated brake fluid. Other
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
• Refill with the same type of brake fluid that
is already in the system. Mixing brake fluids
may result in a harmful chemical reaction,
leading to poor brake performance.
• When refilling, be careful that water does
not enter the brake master cylinder reser-
voir. Water will significantly lower the boil-
ing point of the brake fluid and could cause
vapor lock.
Recommended fluid
DOT 4
T
R
.
.
Brake hose union bolt
28 Nm (2.8 m·kgf, 20 ft·lbf)
New
4
2
1
New
3
T
R
.
.
Rear brake caliper bolt
40 Nm (4.0 m·kgf, 29 ft·lbf)
Recommended fluid
DOT 4
33˚ – 37˚
New

Yamaha YP125R Specifications

General

Engine Type	Liquid-cooled, 4-stroke, SOHC, 4-valve
Bore x Stroke	52.4 mm x 57.9 mm
Fuel System	Fuel Injection
Ignition System	TCI
Transmission	V-Belt Automatic
Front Suspension	Telescopic fork
Rear Suspension	Unit Swing
Front Brake	Hydraulic single disc, Ø267 mm
Starter System	Electric
Rear Tyre	140/70-14M/C 62P (Tubeless)