Yamaha 2007 XP500 Service Manual page 23

2.Pressurized state
Port D "11" is closed by the "pressurization" signal transmitted from the ECU (ABS). Before this oc-
curs, the spool of the flow control valve has compressed the return spring to close port B "9". Brake
fluid that has entered through port A "7" is further restricted by the orifice "10" and the brake fluid is
sent to the brake calipers via port A "7" and port C "13". At this time, the brake is pressurized at a
constant speed regardless of the brake fluid pressure level since restriction of port A "7" changes
so that a constant pressure difference is maintained between chamber A "20" and chamber B "21"
of the flow control valve.
1. Brake master cylinder
2. Brake light switch
3. ABS motor
4. Pump
5. Buffer chamber
6. Flow control valve
7. Port A
8. Spool
9. Port B
10. Orifice
11. Port D
12. Solenoid valve
13. Port C
14. Brake caliper
15. ECU (ABS)
16. ABS warning light
17. Brake fluid pressure
18. Time
19. Repressurizing
20. Chamber A
21. Chamber B
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FEATURES