| Diagram | FRONT BRAKE |
| Subsystem | brakes |
| Listed in parts books | Not catalogued by year yet |
Primary cup (99-2757)
Primary cup for a front brake master cylinder, cross-numbered 99-2757.
This is a primary cup, listed in our records under 3842-424 with a cross number of 99-2757. It shows up in the front brake section of the parts books, which puts it inside a master cylinder assembly, where it acts as a seal on the piston that pushes brake fluid down the line when the lever is pulled.
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Our catalog record for this one is thin - a single appearance tied to the 1974 model year. If you're rebuilding a front brake master cylinder and matching parts against a book, this is the primary cup called out for that cylinder in that catalog listing. Give us a call and we'll confirm it lines up with what's on your bike before you order.
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