Emergency Braking (Abs Activated And Ubs Not Activated) - Yamaha R1 Series 2015 Service Manual

Table of Contents

1. Front brake master cylinder

2. Brake lever

3. Rear brake master cylinder

4. Brake pedal

5. Separation solenoid valve

6. Hydraulic pump

7. Shuttle solenoid valve

Emergency braking (ABS activated and UBS not activated)

Depressurizing phase:

When the front wheel (or the rear wheel) is about to lock, the outlet solenoid valve is opened by the

"depressurization" signal transmitted from the ABS ECU. When this occurs, the inlet solenoid valve

closes the brake line from the 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 brake caliper is re-

duced. The brake fluid stored in the buffer chamber is pumped back to the brake master cylinder by the

hydraulic pump linked to the ABS motor.

Pressurizing phase:

The outlet solenoid valve is closed by the "pressurization" signal transmitted from the ABS ECU. At this

time, the ABS ECU controls the opening of the inlet solenoid valve. As the inlet solenoid valve opens,

the brake line from the brake master cylinder opens, allowing the brake fluid to be sent to the brake

8. Inlet solenoid valve

9. Outlet solenoid valve

10.Rear brake caliper

11.Front brake calipers

A. Pressurize