2004 YAMAHA YZ250F brake

5 - 22
CHAS

FRONT BRAKE AND REAR BRAKE
4. Install:

Pin
1


Washer
2


Cotter pin
3

NOTE:

After installing, check the brake pedal height.
Refer to “REAR BRAKE ADJUSTMENT” sec-
tion in the CHAPTER 3.
Front brake hose
1. Install:

Brake hose
1

To brake hose holder
2
.
NOTE:

Before tightening the bolt (brake hose holder),
align the top
a
of the brake hose neck with the
brake hose holder bottom
b
. Then pass the
brake hose in front of the axle boss
c
and fit it
into the hose groove
d
so that the brake hose
does not contact the nut (wheel axle).
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

2. Install:

Brake hose cover
1


Washer
2


Bolt [brake hose cover (M8)]
3


Bolt [brake hose cover (M6)]
4
T R..16 Nm (1.6 m · kg, 11 ft · lb)
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
3. Pass the brake hose through the cable
guide 1, then through the guide a on
the protector 2.

5 - 23
CHASFRONT BRAKE AND REAR BRAKE
4. Install:
Copper washer 1
Brake hose 2
Union bolt 3
WARNING
Always use new copper washers.
CAUTION:
Install the brake hose so that its pipe por-
tion a directs as shown and lightly
touches the projection b on the brake
master cylinder.
T R..30 Nm (3.0 m · kg, 22 ft · lb)
Rear brake hose
1. Install:
Copper washer 1
Brake hose 2
Union bolt 3
WARNING
Always use new copper washers.
CAUTION:
Install the brake hose so that its pipe por-
tion a directs as shown and lightly
touches the projection b on the brake cali-
per.
T R..30 Nm (3.0 m · kg, 22 ft · lb)

5 - 24
CHASFRONT BRAKE AND REAR BRAKE
2. Install:
Brake hose holder 1
Screw (brake hose holder) 2
CAUTION:
After installing the brake hose holders,
make sure the brake hose does not contact
the spring (rear shock absorber). If it does,
correct its twist.
T R..1 Nm (0.1 m · kg, 0.7 ft · lb)
Brake fluid
1. Fill:
Brake fluid
Until the fluid level reaches “LOWER”
level line a.
WARNING
Use only the designated quality brake
fluid:
otherwise, the rubber seals may deterio-
rate, causing leakage and poor brake per-
formance.
Refill with the same type of brake fluid;
mixing fluids may result in a harmful chem-
ical reaction and lead to poor performance.
Be careful that water does not enter the
master cylinder when refilling. Water will
significantly lower the boiling point of the
fluid and may result in vapor lock.
CAUTION:
Brake fluid may erode painted surfaces or
plastic parts. Always clean up spilled fluid
immediately.
ÅFront
ıRear
Recommended brake fluid:
DOT #4
Å
ı

5 - 25
CHASFRONT BRAKE AND REAR BRAKE
2. Air bleed:
Brake system
Refer to “BRAKE SYSTEM AIR
BLEEDING” section in the CHAPTER
3.
3. Inspect:
Brake fluid level
Fluid at lower level → Fill up.
Refer to “BRAKE FLUID LEVEL
INSPECTION” section in the CHAP-
TER 3.
4. Install:
[Front]
Reservoir float
Diaphragm
Brake master cylinder cap 1
Screw (brake master cylinder cap) 2
[Rear]
Diaphragm
Brake master cylinder cap 1
Bolt (brake master cylinder cap) 2
CAUTION:
After installation, while pulling the brake
lever in or pushing down on the brake
pedal, check whether there is any brake
fluid leaking where the union bolts are
installed respectively at the brake master
cylinder and brake caliper.
ÅFront
ıRear
5. Install: (rear brake only)
Protector 1
Bolt (protector) 2
Å
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
ı
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)

5 - 26
CHASFRONT FORK
EC550000
FRONT FORK
Extent of removal:1 Front fork removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalFRONT FORK REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNINGSupport the machine securely so there is nodanger of it falling over.
Front wheel Refer to “FRONT WHEEL AND REAR
WHEEL” section.
Front brake caliper Refer to “FRONT BRAKE AND REAR
BRAKE” section.
Number plate
Handlebar Refer to “HANDLEBAR” section.
1 Protector 1
2 Brake hose holder 2
3 Pinch bolt (upper bracket) 2 Only loosening.
4 Cap bolt 1Loosen when disassembling the front fork.
5 Pinch bolt (lower bracket) 2 Only loosening.
6 Front fork 1
1

5 - 38
CHASFRONT FORK
5. Install:
Brake hose holder 1
Brake caliper 2
Bolt (brake caliper) 3
NOTE:
Fit the brake hose holder cut a over the pro-
jection b on the front fork and clamp the brake
hose.
T R..23 Nm (2.3 m · kg, 17 ft · lb)
6. Install:
Brake hose holder 1
Bolt (brake hose holder) 2
Protector 3
Bolt (protector) 4
NOTE:
When installing the brake hose holder, align
the top a of the brake hose neck with the
brake hose holder bottom b. Then pass the
brake hose 5 in front of the axle boss c and
fit it into the hose groove d so that the brake
hose does not contact the nut (wheel axle).
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
7. Adjust:
Rebound damping force
NOTE:
Turn in the damping adjuster 1 finger-tight
and then turn out to the originally set position.

5 - 39
CHASHANDLEBAR
EC5B0000
HANDLEBAR
Extent of removal:1 Handlebar removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalHANDLEBAR REMOVAL
Number plate Remove the clamp portion only.
1 Hot starter cable 1 Disconnect at the lever side.
2 Hot starter lever holder 1
3 Clutch cable 1 Disconnect at the lever side.
4 Clutch lever holder 1
5 Engine stop switch 1
6 Brake master cylinder 1 Refer to “REMOVAL POINTS”.
7 Throttle cable cap 1
8 Throttle cable #2 (pushed) 1 Disconnect at the throttle side.
9 Throttle cable #1 (pulled) 1 Disconnect at the throttle side.
10 Right grip 1 Refer to “REMOVAL POINTS”.
11 Tube guide 1
12 Grip cap cover 1
13 Collar 1
14 Left grip 1 Refer to “REMOVAL POINTS”.
15 Handlebar upper holder 2
16 Handlebar 1
1

5 - 40
CHAS
EC5B3000
REMOVAL POINTS
Brake master cylinder
1. Remove:
Brake master cylinder bracket 1
Brake master cylinder 2
CAUTION:
Do not let the brake master cylinder hang
on the brake hose.
Keep the brake master cylinder cap side
horizontal to prevent air from coming in.
EC5B3200
Grip
1. Remove:
Grip 1
NOTE:
Blow in air between the handlebar or tube
guide and the grip. Then remove the grip
which has become loose.
EC5B4000
INSPECTION
EC5B4100
Handlebar
1. Inspect:
Handlebar 1
Bends/cracks/damage → Replace.
WARNING
Do not attempt to straighten a bent handle-
bar as this may dangerously weaken the
handlebar.
HANDLEBAR