Wilwood High Volume Master Cylinder Cap with Diaphragm Gasket 330-13945

If you're running large-piston calipers or pushing your braking system hard on the track, you need a master cylinder that keeps up—and doesn't run dry mid-session. The Wilwood High-Volume Master Cylinder delivers 8.2 ounces of fluid capacity, giving you 26% more volume than standard units, which means consistent pressure and reliable modulation even under sustained braking demands. Paired with the included reservoir cap and gasket, this aluminum unit seals tight against moisture and contamination while keeping your brake fluid where it belongs.

Built from high-grade aluminum, the Wilwood master cylinder combines lightweight construction with the durability required for serious racing and performance driving. The 1-7/16 inch piston travel and heavy-duty internal springs ensure fast retraction and immediate brake release, while the moisture-proof bellows gasket protects fluid integrity lap after lap.

• Material: High-grade aluminum
• Fluid capacity: 8.2 ounces
• Piston travel: 1-7/16 inches
• Capacity advantage: 26% over comparable units
• Internal springs: Heavy-duty, fast retraction
• Reservoir cap: Included, moisture-proof
• Gasket type: Bellows-style diaphragm
• Outlet port: 1/8-27 NPT
• Mounting: Flange or side mount options
• MPN: 330-13945