For right-hand drive vehicles, lower the vacuum in the
Brake Booster by firmly pumping the brake pedal 4-5 times with the engine switched off. Remove the negative
Battery Cable and put it aside. Bleed the master cylinder first and, if you remove them, put the proportioning valves back in their correct ports, using new O-rings. Check and clean the O-ring on the rear flange of the master cylinder and replace it if it's damaged and make sure you wipe the power brake booster to avoid contaminating it. Put the master cylinder assembly directly inside the booster and fasten it with the two retaining nuts, tightening each nut to 18 Nm (160 in. lbs.). Add the
Brake Lines to the master cylinder, tighten them with a torque wrench set to 17 Nm (145 in. lbs.) and link the wiring of the brake fluid level switch. Make sure the master cylinder is up to the proper amount, pump the brake pedal and keep checking the level until it is correct. If your airplane has sat with the brake system exposed to air for a while, you must bleed the entire base hydraulic system. Go for a ride in the car to see that everything brakes as expected and look for any leaks by examining the lines.