2006 YAMAHA YFZ450 brake

8-87
NOTE:
8To access the rear brake fluid reservoir cap,
remove the seat (see page 4-27), remove the
rear brake fluid reservoir bracket bolt, and
then pull the rear brake fluid reservoir out to
the side as shown.
8When installing the rear brake fluid reservoir,
make sure the projection on the rear brake
fluid reservoir bracket is inserted into the hole
in the frame.
cC
Do not tilt the rear brake fluid reservoir
excessively when removing or installing the
rear brake fluid reservoir. Also do not twist
or pull the hose of the reservoir.
2
4
13
1
1. Frame 2. Projection
3. Rear brake fluid reservoir bracket
4. Rear brake fluid reservoir bracket bolt
1. Armature 2. Saillie
3. Support du réservoir de liquide du frein arrière
4. Boulon de support du réservoir de liquide du frein arrière
1. Bastidor 2. Saliente
3. Ménsula del depósito del líquido de los frenos traseros
4.
Perno de la ménsula del depósito del líquido de los frenos traseros
1. Raer brake fluid reservoir 1. Réservoir de liquide du frein arrière1. Depósito del líquido de los frenos traseros
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8-89
Observe these precautions:
8When checking the brake fluid level, make
sure the top of the brake fluid reservoir is
level.
8Use only the designated quality brake fluid,
otherwise, the rubber seals may deteriorate,
causing leakage and poor brake performance.
8Refill with the same type of brake fluid. Mixing
fluids may result in a harmful chemical reac-
tion and lead to poor brake performance.
8Be 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.
8Brake fluid may deteriorate painted surfaces
or plastic parts. Always clean up spilled fluid
immediately.
8Have a Yamaha dealer check the cause if the
brake fluid level goes down.Recommended brake fluid: DOT 4
5TG-9-62 8 5/13/05 1:48 PM Page 8-89

8-91
EBU11860
Brake fluid replacement
Complete fluid replacement should be done only
by trained Yamaha service personnel. Have a
Yamaha dealer replace the following compo-
nents during periodic maintenance or when they
are damaged or leaking.
8Replace the oil seals every two years.
8Replace the brake hoses every four years.
5TG-9-62 8 5/13/05 1:48 PM Page 8-91

8-93
EBU11880
Front brake lever free play
The front brake lever should have a free play of
zero mm at the lever end. If not, have a Yamaha
dealer check the brake system.
w
Operating with improperly serviced or
adjusted brakes could cause loss of braking
ability which could lead to an accident.
After servicing:
8Make sure the brakes operate smoothly
and that the free play is correct.
8Make sure the brakes do not drag.
8Make sure the brakes are not spongy. All
air must be bled from the brake system.
Replacement of brake components requires
professional knowledge. These procedures
should be performed by a Yamaha dealer.
a. Brake lever free play a. Jeu du levier de freina. Juego de la palanca de freno
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8-95
EBU10790
Brake pedal height adjustment
The top of the brake pedal should be positioned
15.3 mm below the top of the footrest. If not,
have a Yamaha dealer adjust it.
w
Operating with improperly serviced or
adjusted brakes could cause loss of braking
ability, which could lead to an accident.
After servicing:
8Make sure the brakes operate smoothly
and that the brake pedal position is cor-
rect.
8Make sure the brakes do not drag.
8Make sure the brakes are not spongy. All
air must be bled from the brake system.
Replacement of brake components requires
professional knowledge. These procedures
should be performed by a Yamaha dealer.
a
a. Brake pedal positiona. Hauteur de la pédale de freina. Altura del pedal del freno
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-95

8-97
EBU14160
Parking brake adjustment
Parking brake adjustment may be required if the
parking brake does not hold properly. The cable
length Ashould be adjusted to 47–51 mm.
1. Loosen the locknut and the adjusting nut
on the brake cable below the fuel tank.
2. Fully loosen the locknut and the adjusting
bolt at the rear brake caliper.
3. Turn the adjusting nut on the brake cable
in direction ato increase the cable length
or in direction bto decrease the cable
length.
NOTE:
If the cable cannot be adjusted to specification,
consult a Yamaha dealer.
4. Tighten the locknut on the brake cable.
1
2A
1. Locknut 2. Adjusting bolt
A. Cable length
1. Contre-écrou 2. Boulon de réglage
A. Longueur du câble
1. Contratuerca 2. Perno de ajuste
A. Longitud del cable
1. Locknut 2. Adjusting nut
1. Contre-écrou 2. Écrou de réglage1. Contratuerca 2. Tuerca de ajuste
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8-99
5. Screw in the adjusting bolt at the rear
brake caliper by hand until it feels tight,
then screw it out 1/8 turn. Tighten the lock-
nut to the specified torque.
cC
When tightening the locknut, hold the adjust-
ing bolt with a wrench so that the adjusting
bolt does not turn together with the locknut.
w
Operating with improperly adjusted brakes
could cause the brakes to malfunction, result-
ing in reduced braking performance. This
could increase the chance of a collision or
accident. After adjusting the parking brake,
block the rear of the machine off the ground
and spin the rear wheels. Check to make sure
there is no brake drag. If brake drag is noticed,
perform the adjustment again.
Tightening torque:
Locknut:
16 Nm (1.6 m0kgf)
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8-101
EBU08330
Adjusting the rear brake light switch
The rear brake light switch, which is activated by
the brake pedal and brake lever, is properly
adjusted when the brake light comes on just
before braking takes effect. If necessary, adjust
the brake light switch as follows.
Turn the adjusting nut while holding the rear
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. Rear brake light switch
2. Adjusting nut
1. Contacteur de feu stop sur frein arrière
2. Écrou de réglage
1. Interruptor de la luz de freno trasero
2. Tuerca de ajuste
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-101