[Pilot_951S]

There are two ways to get adjustable bias.

The cheap and easy way is to put an in line manually contorlled proportioning valve on the rear brake line where it comes off the master cylinder. Willwood has a decent one.

The Expensive way is the Kokeln dual manual master cylinder with a bias bar. This is cockpit adjustable. The bias bar is the better way to go (because it literally balances brake line pressure at the cylinder rather than limiting pressure in a line) but is many times more expensive than a simple proportioning valve, and requires much greater leg effort.

The proportioning valve can also be moved to the cockpit but it requires rerouting the brake line for the rear brake circuit through the passenger compartment.