VW universal master cylinder. This is a durable, universal master cylinder made for kit cars. So if you are building a sand rail, dune buggy, or any kit car built on a VW Beetle (Type I) chassis this is the brake master cylinder you are looking for.
Before you install your new universal master cylinder you will want to install a new reservoir to bench bleed the master cylinder. A bench bleed will pull the fluid though the master cylinder and remove air from it. Once the master cylinder is installed you will simply need to bleed the rest of your brakes like normal. Use a high quality brake fluid like ATE Super Blue Brake Fluid to keep your project vehicle brakes working well in extreme conditions.