Assembling The Rear Brake Master Cylinder; Installing The Rear Brake Master Cylinder - Yamaha YZ 2019 Series Owner's Service Manual

4. Check:
• Brake hose
Cracks/damage/wear  Replace.
EAM30050
ASSEMBLING THE REAR BRAKE MASTER
CYLINDER
EWA13520
WARNING
• 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.
Specified brake fluid
DOT 4
1. Wash the brake master cylinder and the
brake master cylinder kit with brake fluid.
2. Install:
• Primary cylinder cup "1"
• Secondary cylinder cup "2"
Install to the brake master cylinder piston "3".
EWA19300
WARNING
Apply brake fluid to the cylinder cups and in-
stall them as shown. Wrong orientation in in-
stallation causes poor braking performance.
1
1
3. Install:
• Spring "1"
Install to the brake master cylinder piston "2".
2
3
2
3
4-29
TIP
Install the spring with a smaller inside diameter
to the brake master cylinder piston.
1
4. Install:
• 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
NOTICE
Make sure that the pipe portion of the brake
REAR BRAKE
2
New
3
New New
1
4
2