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Hayes HFX-Mag/-9 Sole Master Cylinder Retaining Washer

Hayes HFX-Mag/-9 Sole Master Cylinder Retaining Washer
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NOTE: "In store" availability on bicycles includes some bikes still in boxes. Please contact us via the live chat icon at the bottom of the page or call us at (303)444-4196 to confirm build status. ----------------This item is not permitted to be shipped, however it can be purchased online and picked up at your convenience. We also offer $25 regional Home Delivery for any purchase.

To use our $25 Boulder Area Delivery service, select it while viewing your cart or during the checkout process.
Please call us at 303-444-4196 with any compatibility questions! We are always happy to help.


Internally fitting service parts for Hayes hydraulic disc brake master cylinders.

- All HFX-MAG compatible master cylinder internals are designed for the current aluminum piston/2mm push-rod platform (2003 and newer).

Part Numbers

844171000045 03-16016