Description:

This flexible diaphragm fits beneath the brake master cylinder reservoir cap. It forms a barrier between the brake fluid and the vented airspace above it, helps limit moisture and contamination, and flexes as the reservoir level changes. Replace it if torn, hardened, swollen or permanently distorted, and seat it evenly before reinstalling the cap.

Replaces OEM #45520-300-000

• Fits beneath the brake master cylinder reservoir cap
• Flexes with normal brake fluid level changes
• Helps limit moisture and contamination in the reservoir

Fits

• 1971-1973 Honda CB500K
• 1972-1974 Honda CB350F
• 1974-1978 Honda CB550K
• 1975-1977 Honda CB400F
• 1975-1977 Honda CB550F
• 1978 Honda CB400T