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Installing The Rear Brake Master Cylinder - Yamaha YZ250FM 2021 Owner's Service Manual

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3. Install:
• Spring "1"
(to the brake master cylinder piston "2")
TIP
Install the spring with a smaller inside diameter
to the brake master cylinder piston.
1
4. Install:
• Brake master cylinder kit "1"
• Push rod "2"
• Circlip "3"
New
• Dust boot "4"
TIP
• Before installation, apply brake fluid to the
brake master cylinder kit.
• Before installation, apply silicone grease to the
push rod end.
• Use circlip pliers to install the circlip.
EAM30051
INSTALLING THE REAR BRAKE MASTER
CYLINDER
1. Install:
• Copper washer
New
• Brake hose
• Union bolt
Brake hose union bolt
30 N·m (3.0 kgf·m, 22 lb·ft)
EWA13531
WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation.
ECA24500
Make sure that the pipe portion of the brake
hose touches the projection "a" on the brake
caliper.
2
2. Pour brake fluid to the brake fluid reservoir up
New
EWA13090
• Use only the designated brake fluid. Other
• Refill with the same type of brake fluid that
• When refilling, be careful that water does
3
New
New
1
4
ECA24510
2
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean up
any spilt brake fluid immediately.
3. Bleed:
4. Check:
5. Check:
4-33
NOTICE
to the specified level.
Specified brake fluid
DOT 4
WARNING
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
is already in the system. Mixing brake fluids
may result in a harmful chemical reaction,
leading to poor brake performance.
not enter the brake fluid reservoir. Water
will significantly lower the boiling point of
the brake fluid and could cause vapor lock.
NOTICE
• Brake system
Refer to "BLEEDING THE HYDRAULIC
BRAKE SYSTEM" on page 3-25.
• Brake fluid level
The minimum level mark or below  Add.
Refer to "CHECKING THE BRAKE FLUID
LEVEL" on page 3-24.
• Brake pedal operation
A softy or spongy feeling  Bleed the brake
REAR BRAKE
a

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