2010 YAMAHA GRIZZLY 450 Owners Manual

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Refill with the same type of brake fluid. Mixing
fluids may result in a harmful chemical reaction
and lead to poor braking performance.
Be careful that water does not enter the brake
fluid reservoir when refilling. Water will signifi-
cantly lower the boiling point of the fluid and may
result in vapor lock.
Brake fluid may deteriorate painted surfaces or
plastic parts. Always clean up spilled fluid imme-
diately.
As the brake pads wear, it is normal for the brake
fluid level to gradually go down. However, if the
brake fluid level goes down suddenly, have a
Yamaha dealer check the cause.EBU24281Changing the brake fluid Have a Yamaha dealer change the brake fluid at
the intervals specified in the TIP after the periodic
maintenance and lubrication chart. In addition,
have the oil seals of the brake master cylinder and
calipers as well as the brake hoses replaced at the
intervals listed below or whenever they are dam-
aged or leaking.
Oil seals: Replace every two years.
Brake hoses: Replace every four years.
EBU24394Checking the front brake lever free play The brake lever free play must be checked at the
intervals specified in the periodic maintenance and
lubrication chart. The brake lever should have no
free play as shown. If there is free play, have a
Yamaha dealer check the brake system.1. No brake lever free play
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EBU28637Adjusting the brake pedal and rear
brake lever free play and checking the
brake pedal position The brake pedal and brake lever free play and the
brake pedal position must be checked and, if nec-
essary, adjusted at the intervals specified in the
periodic maintenance and lubrication chart.TIP
Always perform this maintenance completely in
the following order whenever adjusting the rear
brake.
When adjusting the rear brake, be sure to adjust
both the brake pedal and the brake lever.
Before adjusting the brake lever and brake pedal
free play, check the rear brake friction plates for
wear.Adjusting the brake pedal and brake lever free
play
The brake pedal free play should measure 17.0–
20.0 mm (0.67–0.79 in). The brake lever free play
should measure 8.0–10.5 mm (0.31–0.41 in). If ei-
ther free play is incorrect, adjust it as follows.
1. Loosen the locknut at the brake lever and fully
turn in the brake lever free play adjusting bolt.
1. Brake pedal free play
1. Brake lever free play
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8 2. Fully loosen the brake lever free play adjust-
ing nut on the brake cable at the final gear
case.3. Push the brake camshaft lever in direction (a)
until it stops [apply approximately 50 N (5.0
kgf, 11.2 lbf) of force], and then turn the brake
pedal free play adjusting nut on the brake ca-
ble at the final gear case so that gap “A” mea-
sures 2.5–3.0 mm (0.10–0.12 in).
1. Locknut
2. Brake lever free play adjusting bolt
1. Brake lever free play adjusting nut
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84. Push the brake camshaft lever in direction (a)
until it stops [apply approximately 50 N (5.0
kgf, 11.2 lbf) of force], and then turn the brake
lever free play adjusting nut on the brake ca-
ble at the final gear case so that gap “B” mea-
sures 4.0–6.0 mm (0.16–0.24 in).5. Check the brake lever free play and, if neces-
sary, adjust it by turning the brake lever free
play adjusting bolt at the brake lever. Turn the
brake lever free play adjusting bolt in direction
(a) to increase the free play, and in direction
(b) to decrease it.
1. Brake pedal free play adjusting nut
2. Brake camshaft lever
3. Gap “A”
1. Brake lever free play adjusting nut
2. Brake camshaft lever
3. Gap “B”
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8 6. Tighten the locknut at the brake lever.
TIPWhen adjusting the rear brake lever free play:
Be sure not to step on the brake pedal.
Make sure the brake pedal does not move.Checking the brake pedal position
The top of the brake pedal should be positioned
75.0–85.0 mm (2.95–3.35 in) above the footboard.
If the brake pedal position is incorrect, have a
Yamaha dealer adjust it.
EBU24230Axle boots The axle boots must be checked for damage at the
intervals specified in the periodic maintenance and
lubrication chart. Check the axle boots for tears or
damage. If any damage is found, have them re-
placed by a Yamaha dealer.
1. Locknut
2. Brake lever free play adjusting bolt
1. Distance between brake pedal and footboard
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EBU24753Brake light switches The rear brake light, which is activated by the
brake pedal and brake lever, should come on just
before braking takes effect.
The brake light switch for the brake pedal can be
adjusted as follows, but the front brake light switch
should be adjusted by a Yamaha dealer.
1. Remove panel B. (See page 8-9.)
2. Turn the brake light switch adjusting nut while
holding the brake light switch in place. To
make the brake light come on earlier, turn the
adjusting nut in direction (a). To make the
brake light come on later, turn the adjusting
nut in direction (b).
1. Front axle boot (each side)
1. Rear axle boot (each side)
1
1
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8 3. Install the panel.
EBU24901Checking and lubricating the cables The operation and the condition of all control ca-
bles should be checked before each ride, and the
cables and cable ends should be lubricated if nec-
essary. If a cable is damaged or does not move
smoothly, have a Yamaha dealer check or replace
it.
WARNING
EWB02581
Inspect cables frequently and replace if dam-
aged. Corrosion can result when the cable
sheaths become damaged, and cables can
also become frayed or kinked, which could
restrict the operation of controls and lead to
an accident or injury.
Always make sure all control cables work
smoothly before you begin riding in cold
weather. If the control cables are frozen or do
not work smoothly, you could be unable to
control the ATV, which could lead to an acci-
dent or collision.EBU28711Checking and lubricating the front and
rear brake levers The operation of the front and rear brake levers
should be checked before each ride, and the lever
pivots should be lubricated if necessary.
1. Brake light switch
2. Brake light switch adjusting nutRecommended lubricant:
Engine oil
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8Front brake leverRear brake lever
EBU28832Checking and lubricating the brake
pedal The operation of the brake pedal should be
checked before each ride, and the pedal pivot
should be lubricated if necessary.TIPTo access the brake pedal pivot, remove panel B.
(See page 8-9.)
Recommended lubricants:
Front brake lever:
Silicone grease
Rear brake lever:
Lithium-soap-based grease
Recommended lubricant:
Lithium-soap-based grease
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