Yamaha Tracer MT09TRA - Service manual > Removing the rear brake master cylinder

1. Remove:

• Brake hose union bolt "1"
• Brake hose gaskets "2"
• Brake hose "3"

TIP

To collect any remaining brake fluid, place a container under the master cylinder and the end of the brake hose.

Checking the rear brake master cylinder

1. Check:

• Brake master cylinder

Damage/scratches/wear → Replace.

• Brake fluid delivery passages (brake master cylinder body)

Obstruction → Blow out with compressed air.

2. Check:

• Brake master cylinder kit

Damage/scratches/wear → Replace.

3. Check:

• Brake fluid reservoir "1"
• Brake fluid reservoir diaphragm holder "2"

Cracks/damage → Replace.

• Brake fluid reservoir diaphragm "3"

Damage/wear → Replace.

4. Check:

• Brake hose
• Brake fluid reservoir hose

Cracks/damage/wear → Replace.

Assembling the rear brake master cylinder

WARNING

• Before installation, all internal brake components should be cleaned and lubricated with clean or new brake fluid.
• Never use solvents on internal brake components.

Specified brake fluid DOT 4

1. Install:

• Brake master cylinder kit

Installing the rear brake master cylinder

1. Install:

• Brake hose gaskets
• Brake hose
• Brake fluid reservoir hose
• Brake hose union bolt

Rear brake hose union bolt 30 Nm (3.0 m*kgf, 22 ft*lbf)

WARNING

Proper brake hose routing is essential to insure safe vehicle operation.

NOTICE

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 specified brake fluid)

Specified brake fluid DOT 4

WARNING

• 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.

NOTICE

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 (ABS)"

4. Check:

• Brake fluid level

Below the minimum level mark "a" → Add the specified brake fluid to the proper level.

Refer to "CHECKING THE BRAKE FLUID LEVEL"

5. Adjust:

• Brake pedal position

Refer to "ADJUSTING THE REAR DISC BRAKE"

6. Adjust:

• Rear brake light operation timing

Refer to "ADJUSTING THE REAR BRAKE LIGHT SWITCH"

See also: