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ABS OUTLINE
GEN
INFO
YAMAHA ABS PROVIDES 3 MAIN ADVANTAGES
1. Securely controls the wheel locking at urgent braking under various conditions of road surface and
weather, and gives full play to tires’ original performance.
For higher reliability, the electronic control unit (ECU) is composed of the main and sub processors and
equipped with the high level self diagnostic function.
2. Smooth braking can be also performed when the ABS system is activated. Change of chassis behavior
such as pitching is few and this system will not damage the rider’s comfortable drive feeling.
When the ABS works, the system informs the brake fluid pressure change to a rider via brake levers.
3. Weight of the hydraulic unit (HU) which is the main of system is 2.2 kg for YAMAHA ABS. We designed to
gather the mass by locating this unit at the central portion of scooter. Since the wheel assembly (wheel
sensor) also has extremely lightweight structure, the vehicle’s weight gives no damage to the mobility
which YP250A provides such as an excellent safety operation.
SYSTEM LAYOUT
1 ABS warning light
2 Front / Rear master cylinders
Front / Rear brake levers
Front / Rear brake switches
3 Fail-safe relay
4
5
6
7
8
Brake light relay
Rear brake caliper
Rear wheel sensor
Electronic control unit
Rear disc rotor
3
9
10
11
12
Hydraulic unit
Front brake caliper
Front wheel sensor
Front disc rotor