2001 YAMAHA YFM400F brake

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If your ATV can’t make it up a hill you are
trying to climb:
Turn the ATV around if you still have for-
ward speed. If not, stop, dismount on the
uphill side of the ATV and physically turn
the ATV around. If the ATV starts to slip
backwards DO NOT USE THE REAR BRAKE
- the ATV may tip over on top of you. Dis-
mount the ATV on the uphill side. (See
pages 7-45 ~ 7-53.)
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If your ATV is traversing a sloping surface:
Be sure to ride with your weight positioned
towards the uphill side of the ATV to main-
tain proper balance. If the ATV starts to tip,
steer down the hill (if there are no obstacles
in your way) to regain balance. If you dis-
cover that the ATV is going to tip over, dis-
mount on the uphill side. (See pages 7-59 ~
7-61.)

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If your ATV encounters shallow water:
Ride slowly and carefully through slow
moving water, watching for obstacles. Be
sure to let water drain from the ATV and
CHECK YOUR BRAKES FOR PROPER OPER-
ATION when you come out of the water. Do
not continue to ride your ATV until you have
regained adequate braking ability. (See
pages 7-63 ~ 7-67.)

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PERIODIC MAINTENANCE/LUBRICATION
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year
Valves*

• Check valve clearance.
• Adjust if necessary.
Cooling system
• Check coolant leakage.
• Repair if necessary.
• Replace coolant every 24 months.
Spark plug
• Check condition.
• Adjust gap and clean.
• Replace if necessary.
Air filter
• Clean.
• Replace if necessary.Every 20~40 hours
(More often in wet or dusty areas.)
Crankcase breather
system*

• Check breather hose for cracks or damage.
• Replace if necessary.

Exhaust system*

• Check for leakage.
• Retighten if necessary.
• Replace gasket(s) if necessary.

Carburetor*

• Check and adjust idle speed/starter operation.
• Adjust if necessary.

Fuel line*

• Check fuel hose for cracks or damage.
• Replace if necessary.

Engine oil

• Replace (Warm engine before draining).

Engine oil filter cartridge

• Replace.

Engine oil strainer*

• Clean.

Final gear oil

• Check oil level/oil leakage.
• Replace every 12 months.

Differential gear oil
Front brake*

• Check operation/fluid leakage/see NOTE page 8-8.
• Correct if necessary.

Rear brake*

• Check operation/fluid leakage/see NOTE page 8-8.
• Correct if necessary.

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* It is recommended that these items be serviced by a Yamaha dealer.NOTE:

Recommended brake fluid: DOT 4
Brake fluid replacement:
1. When disassembling the master cylinder or caliper cylinder, replace the brake fluid. Normally
check the brake fluid level and add fluid as required.
2. On the inner parts of the master cylinder and caliper cylinder, replace the oil seals every two
years.
3. Replace the brake hoses every four years, or if cracked or damaged.
V-belt*

• Check operation.
• Check for cracks or damage every 12 months or
2,400 km whichever comes first.

Wheels*

• Check balance/damage/runout.
• Repair if necessary.

Wheel bearing*

• Check bearing assemblies for looseness/damage.
• Replace if damaged.

Front and rear
suspension*

• Check operation.
• Correct if necessary.

Steering system*

• Check operation/Replace if damaged.
• Check toe-in/Adjust if necessary.

Front axle boots*
• Check operation.
• Replace if damaged.
Fittings and Fasteners*
• Check all chassis fittings and fasteners.
• Correct if necessary.
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year

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Front brake pad inspection
Inspect the brake pads for damage and wear. If
the thickness is less than the specified value,
have a Yamaha dealer replace the pads.NOTE:The wheels need to be removed to inspect the
brake pads. See page 8-107 for removal proce-dures.
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Rear brake pad inspection
Inspect the brake pad for damage or wear.
Wear indicator grooves are provided on the
brake pad. These indicators allow checking of
brake pad wear without disassembling the
brake. Inspect the grooves. If they have almost
disappeared, ask a Yamaha dealer to replace
the pad.NOTE:The wheel needs to be removed to inspect the
brake pad. See page 8-107 for removal proce-dures.
a. Wear limit: 1 mm
a. Limite d’usure: 1 mm
a. Límite de desgaste: 1 mm1. Wear indicator (´ 3)
1. Indicateur d’usure (´ 3)
1. Indicador de desgaste (´ 3)

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Inspecting the brake fluid level
Insufficient brake fluid may let air enter the
brake system, possibly causing the brakes to
become ineffective.
Before riding, check that the brake fluid is
above the lower level and replenish when nec-
essary. The rear brake fluid master cylinder
reservoir is located under panel C. (See pages
8-23 ~ 8-25 for removal and installation proce-
dures.)
Observe these precautions:
1. When checking the fluid level, make sure
the top of the master cylinder reservoir is
level by turning the handlebars.
2. Use only the designated quality brake flu-
id. Otherwise, the rubber seals may dete-
riorate, causing leakage and poor brake
performance.
Recommended brake fluid: DOT 4
1. Minimum level mark
1. Repère de niveau minimum
1. Marca de nivel mínimoFRONT
Avant
Delantero1. Maximum level mark
1. Repère de niveau maximum
1. Marca de nivel máximoREAR
Arrière
Trasero

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3. Refill with the same type of brake fluid.
Mixing fluids may result in a harmful
chemical reaction and lead to poor brake
performance.
4. Be careful that water does not enter the
master cylinder reservoir when refilling.
Water will significantly lower the boiling
point of the fluid and may result in vapor
lock.
5. Brake fluid may deteriorate painted sur-
faces or plastic parts. Always clean up
spilled fluid immediately.
6. Have a Yamaha dealer check the cause if
the brake fluid level goes down.

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Brake fluid replacement
1. Complete fluid replacement should be
done only by trained Yamaha service per-
sonnel.
2. Have a Yamaha dealer replace the follow-
ing components during periodic mainte-
nance or when they are damaged or
leaking.
a. Replace all rubber seals every two years.
b. Replace all hoses every four years.