Chassis
Installing the rear brake master cylinder
In this manual: Chassis
~1min read
1. Install:
- Copper washers "1"

- Brake hose "2"
- Rear brake light switch "3"

Proper brake hose routing is essential to insure safe vehicle operation. Refer to "CABLE ROUTING" on page 2-33.
CAUTION:When installing the brake hose onto the brake master cylinder, make sure the brake pipe touches the projection "a" as shown.

2. Fill:
- Brake fluid reservoir (with the specified amount of the recommended brake fluid)

- Use only the designated brake fluid. Other brake fluids may cause the rubber seals to deteriorate, causing leakage and poor brake performance.
- Refill with the same type of brake fluid that is already in the system. Mixing brake fluids may result in a harmful chemical reaction, leading to poor brake performance.
- When refilling, be careful that water does not enter the brake fluid reservoir. Water will significantly lower the boiling point of the brake fluid and could cause vapor lock.
Brake fluid may damage painted surfaces and plastic parts. Therefore, always clean up any spilt brake fluid immediately.
3. Bleed:
- Brake system Refer to "BLEEDING THE HYDRAULIC BRAKE SYSTEM" on page 3-20.
4. Check:
- Brake fluid level Below the minimum level mark "a"
Add the recommended brake fluid to the proper level.

5. Check:
- Brake pedal operation Soft or spongy feeling
Bleed
the brake system.
6. Adjust:
- Brake pedal position Refer to "ADJUSTING THE REAR DISC BRAKE" on page 3-18.

Test yourself
A quick Yamaha YZF-R125 quiz: every answer comes with an explanation and a link to the manual page.
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