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Home >> Triumph >> 1971 >> Spitfire Not Available Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Brakes - GIRLING >> Adjustment >> Bleeding Hydraulic Brakes >> Single Circuit System

Single Circuit System

Keep reservoir fluid level full while bleeding brakes and ensure level does not drop below half full. Turn rear adjusters to lock brakes. Start bleeding from rear wheel farthest from master cylinder. Wipe bleed valve clean, connect a rubber hose to valve and place hose end in a partially filled jar with brake fluid. Unscrew valve about 1/4 turn. Have a second operator apply brake pedal with fast, full, strokes pausing between each stroke. Pump pedal until air is expelled from fluid.

NOTE: Ensure that master cylinder piston returns to end of its travel for each stroke.

Finish with a few slightly faster applications of pedal using only bottom half of pedal stroke. Close bleed valve with pedal fully depressed. Complete bleeding with cylinder nearest master cylinder.

NOTE: If bleeding continues without success on any one cylinder, air may be leaking through bleeder screw.

In this case, tighten bleeder valve when pedal is at end of each stroke. Adjust brake shoes, check for leaks and top-off reservoir fluid to complete operation.