Outline Of The Abs - Yamaha FJR13AY 2009 Service Manual

Brake pedal input force and braking force at each wheel
a. Brake force
b. Brake pedal force
c. Rear brake force
d. Front brake force (unified brake system)
Metering valve
This valve prevents the brake fluid pressure that is transmitted to the right front brake caliper from in-
creasing until the pressure exceeds a set level. Only the rear brake caliper is operated when there is
an extremely low amount of brake pedal input.
Proportioning valve
This valve reduces the increase in brake fluid pressure that is transmitted to the rear brake caliper when
the pressure exceeds a set level. The increase in brake fluid pressure to the rear brake caliper is con-
trolled when there is a high amount of brake pedal input.
EC3P61017
NOTICE
• The unified brake system is a system to assist the brake operation. However, both the brake
lever and the brake pedal must be operated for maximum braking effect.
• Because the balance between the right front brake caliper and the rear brake caliper in the uni-
fied brake system is determined mechanically, be sure to use the specified brake pads.
• Each set of brake pads should be checked individually and replaced if necessary.
ET3P61019

OUTLINE OF THE ABS

1. The Yamaha ABS (anti-lock brake system) features an electronic control system, which acts on the
front and rear brakes independently. However, one set of pistons in the right front brake caliper is
operated together with the rear brake and this set of pistons is operated only if the force used to de-
press the brake pedal exceeds a preset level.
2. The ABS features a compact and lightweight design to help maintain the basic maneuverability of
the vehicle.
3. The hydraulic unit assembly, which is the main component of the ABS, is centrally located on the
vehicle to increase mass centralization.
c
d
e e
a
f f
b
1-5
e. Proportioning valve operation
f. Metering valve operation
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