YAMAHA WR 450F 2016 Owners Manual

FRONT BRAKE
5-19
3. Install:• Brake caliper piston “1”
TIP
Apply the brake fluid on the piston outer sur-
face.
ECA
NOTICE
• Install the piston with its side “a” facing the brake caliper.
• Never force to insert.
EAS2GC1175INSTALLING THE FRONT BRAKE CALIPER
1. Install:• Front brake caliper bracket
• Front brake caliper(temporarily)
• Copper washers
• Brake hose
• Union bolt
EWA
WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation.
ECA
NOTICE
Make sure that the pipe portion “a” of the
brake hose touches the projection “b” on
the brake caliper. 2. Install:
• Front brake caliper
• Brake pad spring
• Brake pad
• Brake pad pin
• Brake hose holder
Refer to “CHECKING THE FRONT BRAKE
PADS” on page 3-27.
3. Tighten: • Brake hose holder nut “1”
TIP
Make sure that the brake hose holder “2” is in-
stalled with its upper end “a” aligned with the
paint “b” on the brake hose.
4. Pour brake fluid to the brake master cylinder reservoir up to the specified level.
EWA
WARNING
• 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 flu-
ids may result in a harmful chemical reac-
tion, leading to poor brake performance.
• When refilling, be careful that water does not enter the brake fluid reservoir. Water
will significantly lower the boiling point of
the brake fluid and could cause vapor
lock.
ECA
Front brake caliper bracket23 Nm (2.3 m·kgf, 17 ft·lbf)
Brake hose union bolt 30 Nm (3.0 m·kgf, 22 ft·lbf)
1
a1
New
T R..
a
b
Brake pad pin
17 Nm (1.7 m·kgf, 12 ft·lbf)
Brake hose holder nut 7 Nm (0.7 m·kgf, 5.1 ft·lbf)
Specified brake fluid DOT 4
T R..
T R..
1
2
b
a

FRONT BRAKE
5-20
NOTICE
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean
up any spilt brake fluid immediately.
5. Bleed:• Brake systemRefer to “BLEEDING THE BRAKE SYS-
TEM” on page 3-25.
6. Check: • Brake fluid level
The minimum level mark or below  Add.
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-30.
7. Check: • Brake lever free playRefer to “ADJUSTING THE FRONT
BRAKE” on page 3-26.
• Brake lever operation A softy or spongy feeling  Bleed the brake
system.
Refer to “BLEEDING THE BRAKE SYS-
TEM” on page 3-25.
EAS2GC1176REMOVING THE FRONT BRAKE MASTER
CYLINDER
TIP
Before removing the front brake master cylin-
der, drain the brake fluid from the entire brake
system.
1. Remove: • Union bolt
• Copper washers
• Brake hoses
TIP
To drain any remaining brake fluid, place a con-
tainer under the master cylinder and the end of
the brake hose.
EAS2GC1177CHECKING THE FRONT BRAKE MASTER
CYLINDER
1. Check:• Brake master cylinder “1”Damage/scratches/wear  Replace.
• Brake fluid delivery passages “2”
(brake master cylinder body)
Obstruction  Blow out with compressed
air. 2. Check:
• Brake master cylinder kit
Damage/scratches/wear  Replace.
3. Check: • Brake master cylinder reservoir cap
4. Check: • Brake hosesCracks/damage/wear  Replace.
EAS2GC1178ASSEMBLING THE FRONT BRAKE MAS-
TER CYLINDER
EWA
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.
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”.
EWA
WARNING
Apply brake fluid to the cylinder cups and
install them as shown. Wrong orientation in
installation causes poor braking perfor-
mance. Specified brake fluid
DOT 4
1
2

FRONT BRAKE
5-21
3. Install:• Spring “1” Install to the brake master cylinder piston
“2”.
TIP
Install the spring with a smaller inside diameter
to the brake master cylinder piston.
4. Install:• Brake master cylinder kit “1”
• Washer “2”
• Circlip “3”
• Dust boot “4”
• Push rod “5”
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.
EAS2GC1179INSTALLING THE FRONT BRAKE MASTER
CYLINDER
1. Install:
• Brake master cylinder “1”
TIP
• Install the front brake master cylinder holder with the “UP” mark facing up.
• First, tighten the upper bolt, then the lower
bolt.
2. Install: • Copper washers
• Brake hose
• Union bolt
EWA
WARNING
Proper brake hose routing is essential to in-
sure safe vehicle operation.
ECA
NOTICE
During installation, bring the brake hose
into contact with the brake master cylinder
projection “a” and make its bent portion “b”
face downward.
12
3
2
1
3
New
New
Brake master cylinder holder bolt9 Nm (0.9 m·kgf, 6.5 ft·lbf)
Brake hose union bolt 30 Nm (3.0 m·kgf, 22 ft·lbf)
T R..
1
New
T R..

FRONT BRAKE
5-22
TIP
Turn the handlebar toward right and left to
make sure that the brake hose does not touch
other parts (e.g., wire harness, cables, leads).
Adjust if necessary.
3. Pour brake fluid to the brake master cylinder reservoir up to the specified level.
EWA
WARNING
• 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 flu-
ids may result in a harmful chemical reac-
tion, 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.
ECA
NOTICE
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean
up any spilt brake fluid immediately.
4. Bleed:
• Brake systemRefer to “BLEEDING THE BRAKE SYS-
TEM” on page 3-25.
5. Check: • Brake fluid level
The minimum level mark “a” or below 
Add.
Refer to “CHECKING THE BRAKE FLUID
LEVEL” on page 3-30. 6. Check:
• Brake lever free play
Refer to “ADJUSTING THE FRONT
BRAKE” on page 3-26.
• Brake lever operation
A softy or spongy feeling  Bleed the brake
system.
Refer to “BLEEDING THE BRAKE SYS-
TEM” on page 3-25.
Specified brake fluid
DOT 4
a

REAR BRAKE
5-23
EAS2GC1180
REAR BRAKE
Removing the rear brake caliper
OrderPart name Q’tyRemarks
Brake fluid Drain.
Refer to “BLEEDING THE BRAKE SYSTEM”
on page 3-25.
1 Protector 1
2 Union bolt 1
3 Copper washers 2
4 Rear brake hose 1
5 Brake pad pin plug 1
6 Brake pad pin 1
7 Rear brake pad assembly 2
8 Rear brake caliper bracket 1
9 Brake pad springs 2
10 Rear brake disc cover 1
11 Rear brake caliper assembly 1
For installation, reverse the removal proce-
dure.
2
3 4
11
5 6
7 9
1
8
9
10
2.5 Nm (0.25 m•kgf, 1.8 ft•Ibf)T.R.
10 Nm (1.0 m•kgf, 7.2 ft•Ibf)T.R.
10 Nm (1.0 m•kgf, 7.2 ft•Ibf)T.R.
17 Nm (1.7 m•kgf, 12 ft•Ibf)T.R.
30 Nm (3.0 m•kgf, 22 ft•Ibf)T.R.
New
S
7 Nm (0.7 m•kgf, 5.1 ft•Ibf)T.R.

REAR BRAKE
5-24
Disassembling the rear brake caliper
OrderPart name Q’tyRemarks
1 Brake caliper piston 1
2 Brake caliper piston dust seal 1
3 Brake caliper piston seal 1
4 Bleed screw 1
For assembly, reverse the disassemble pro-
cedure.
1
23
4
S
BF
T R..6 Nm (0.6 m kgf, 4.3 ft Ibf)

REAR BRAKE
5-25
Removing the rear brake master cylinder
OrderPart name Q’tyRemarks
Brake fluid Drain.
Refer to “BLEEDING THE BRAKE SYSTEM”
on page 3-25.
1 Union bolt 1
2 Copper washers 2
3 Brake hose 1
4 Split pin 1
5Washer 1
6Pin 1
7 Brake master cylinder reservoir cap 1
8 Brake master cylinder reservoir diaphragm plate 1
9 Brake master cylinder reservoir diaphragm 1
10 Rear brake master cylinder 1
For installation, reverse the removal proce-
dure.
1
2 3
4
7
5
8
6
9
T R..
T R..
10
T R..

REAR BRAKE
5-26
Disassembling the rear brake master cylinder
OrderPart name Q’tyRemarks
1 Dust boot 1
2 Circlip 1
3 Push rod 1
4 Brake master cylinder kit 1
For assembly, reverse the disassemble pro-
cedure.
4
3
2
1
BF
S
New
New

REAR BRAKE
5-27
EAS2GC1181INTRODUCTIONEWA
WARNING
If you need to disassemble the disc brake
components, observe the following precau-
tions.
• Never disassemble the brake components unless absolutely necessary.
• If there is any problem with connections on the hydraulic brake system, perform
the following jobs.
Disassemble the brake system, drain the
brake fluid, and clean it. After that, add a
suitable amount of brake fluid. Then, bleed
it after reassembly.
• Use only brake fluid for washing internal
brake components.
• Use new brake fluid for cleaning the brake components.
• Immediately wipe off the spilled brake fluid to avoid damage to painted surfaces or
plastic parts.
• Handle brake fluid with special care not to let it enter your eyes so that you may not
lost your eyesight.
• FIRST AID FOR BRAKE FLUID ENTERING THE EYES:
• Flush with water for 15 minutes and get
immediate medical attention.
EAS2GC1182CHECKING THE REAR BRAKE DISC
1. Remove: • Rear wheel
Refer to “REAR WHEEL” on page 5-9.
2. Check: • Brake disc
Damage/galling  Replace.
3. Measure: • Brake disc thickness
Measure the brake disc thickness at a few
different locations.
Out of specification  Replace.
Refer to “CHECKING THE FRONT BRAKE
DISC” on page 5-17.
4. Measure: • Brake disc deflection
Out of specification  Correct the brake disc
deflection or replace the brake disc. 5. Adjust:
• Brake disc deflection
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the brake disc.
b. Turn the mounted position of the brake disc by one bolt hole.
c. Install the brake disc.
TIP
Tighten the brake disc bolts in stages and in a
crisscross pattern.
d. Measure the brake disc deflection.
e. If out of specification, repeat the adjustment steps until the brake disc deflection is within
specification.
f. If the brake disc deflection cannot be
brought within specification, replace the
brake disc.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
6. Install:• Rear wheel
Refer to “REAR WHEEL” on page 5-9.
Brake disc thickness limit
3.5 mm (0.14 in)
Brake disc runout limit (as mea-
sured on wheel) 0.15 mm (0.0059 in)
Brake disc bolt 14 Nm (1.4 m·kgf, 10 ft·lbf)
LOCTITE®
T R..

REAR BRAKE
5-28
EAS2GC1183REMOVING THE REAR BRAKE CALIPER
TIP
Before disassembling the brake caliper, drain
the brake fluid from the entire brake system.
1. Remove:• Union bolt
• Copper washers
• Brake hose
TIP
Put the end of the brake hose into a container
and pump out the brake fluid.
EAS2GC1184DISASSEMBLING THE REAR BRAKE CALI-
PER
1. Remove:
• Brake caliper piston “1”
• Brake caliper piston dust seal “2”
• Brake caliper piston seal “3”
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Blow compressed air into the brake hose joint opening to force out the piston from the
brake caliper.
EWA
WARNING
• Cover the brake caliper piston with a rag. Be careful not to get injured when the pis-
ton is expelled from the brake caliper.
• Never try to pry out the brake caliper pis-
ton.
b. Remove the brake caliper piston dust seal and the brake caliper piston seal.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS2GC1185CHECKING THE REAR BRAKE CALIPER
1. Check:
• Brake caliper piston “1”Rust/scratches/wear  Replace the brake
caliper piston.
• Brake caliper cylinder “2” Scratches/wear  Replace the brake cali-
per assembly.
• Brake caliper body “3” Cracks/damage  Replace the brake cali-
per assembly.
• Brake fluid delivery passages (brake caliper body)
Obstruction  Blow out with compressed
air.
EWA
WARNING
When the brake caliper is disassembled, re-
place the brake caliper piston seal and the
brake caliper piston dust seal with new
ones.
2. Check: • Brake caliper bracket
Crack/damage  Replace.
EAS2GC1186ASSEMBLING THE REAR BRAKE CALIPEREWA
WARNING
• Before installation, clean and lubricate the
internal parts. Use new brake fluid for
cleaning and lubricating.
• Never use solvents on internal brake com- ponents as they will cause the piston seals
to swell and distort.
• When the brake caliper is disassembled, replace the brake caliper piston seal and
the brake caliper piston dust seal with new
ones.
2 3
1
Specified brake fluid
DOT 4
1
2
3