Yamaha XT1200Z(Z) 2010 Service Manual page 32

UBS (ABS activated and UBS activated)
Brake lever input only
Front brakes:
Refer to "Emergency braking (ABS activated and UBS not activated)".
Rear brake:
When the rear wheel is about to lock, the outlet solenoid valve is opened by the "depressurization" sig-
nal transmitted from the ABS ECU. When this occurs, the inlet solenoid valve closes the brake line from
the rear brake master cylinder. Because the outlet solenoid valve is open, the brake fluid is sent to the
buffer chamber. As a result, the hydraulic pressure in the rear brake caliper is reduced.
In order to control the hydraulic pressure at the pressure required for UBS control at this time, the hy-
draulic pressure is detected using the rear brake master cylinder pressure sensor and rear brake caliper
pressure sensor, and the separation solenoid valve and shuttle solenoid valve open and close.
The brake fluid stored in the buffer chamber is pumped back to the rear brake master cylinder by the
hydraulic pump linked to the ABS motor.
11
1. Front brake master cylinder
2. Brake lever
3. Rear brake master cylinder
4. Brake pedal
5. Rear brake master cylinder pressure sensor
6. Separation solenoid valve
7. Shuttle solenoid valve
8. Damping chamber
9. ABS motor
10. Hydraulic pump
11. Front brake master cylinder pressure sensor
12. Inlet solenoid valve
13. Outlet solenoid valve
14. Check valve
15. Buffer chamber
16. Rear brake caliper pressure sensor
17. Rear brake caliper
a
1
2
8
10
15
12
13
18
3
8
10
9
c
15 14
12
13
b
16
17
18. Front brake calipers
A. Pressurize
B. Depressurize
a. Input
b. Outlet solenoid valve is open
c. Hydraulic pump is operating
d. Separation solenoid valve is open or closed
e. Shuttle solenoid valve is open or closed
f. Inlet solenoid valve is closed
1-23
FEATURES
4
6
5
d
7
e
f
A
B