Wilwood offers bleed kits included with many tandem master cylinder models to assist with bench bleeding. Wrong size master cylinder too small refer to the master cylinder web pages to select the correct size for your application.
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Bleeding wilwood master cylinder. By pushing on the piston fresh fluid enters the chamber from the bottom of the reservoir and displaces air as it gets pumped back into the reservoir. The process of bleeding is used to get rid of any air that may be present in the components. Push and hold the pedal down. Unbolt calipers and hold with bleed screws in the vertical position. The following video shows the complete procedure. Since it all starts from the master cylinder that is the place you have to start whether youre doing a simple replacement or a complete brake upgrade.
Fill the master cylinder reservoir 34 full with clean fresh brake fluid. Open the bleeder valve on the caliper or wheel cylinder until fluid is released. Air in the brake fluid leads to a spongy feel to the pedal and reduced performance of the braking system. Wait three to five seconds and repeat. Close the bleeder valve and release pedal.