This is the master cylinder we use when doing a rear disc brake job in the shop. This master is specifically set up for Land Cruisers with 4 wheel disc brake systems. Works great on Toyota Land Cruisers and Toyota Pickups. This master originally designed for the FzJ80's with a large 1" bore. It bolts directly to your booster and works as normal. Very minor hard line bending may be necessarry. This is the best way to get the bias set correctly. This is master cylinder is new Aisin brand for great results.