5. CHECK THAT PEDAL RESERVE DISTANCE IS CORRECT Release the parking brake. With engine running, depress the pedal and measure the pedal reserve distance, as shown. Pedal reserve distance from asphalt sheet at 50 kg (110.2 lb, 490N): More than 80 mm ( 3.15 in.) If incorrect, troubleshoot the brake system. OPERATIONAL TEST OF BRAKE BOOSTER HINT: If there is no source of vacuum, repair before testing. If available, use a brake booster tester to check the booster in this condition. 1. OPERATING CHECK (a) Depress the brake pedal several times with the engine stopped, and check that is no change in the pedal reserve distance. (b) Depress the brake pedal and start the engine. If the pedal goes down slightly, operation is normal. 2. AIR TIGHTNESS CHECK (a) Start the engine and stop it after one or two minutes. Depress the brake pedal several times slowly. If the pedal goes down further the first time, but gradually rises after the second or third time, the booster is air tight. (b) Depress the brake pedal while the engine is running, and stop it with the pedal depressed. If there is no change in pedal reserve travel after holding the pedal for thirty seconds, the booster is air tight. BLEEDING OF BRAKE SYSTEM HINT: If any work is done on the brake system or if air is suspected in the brake lines, bleed the system of air. NOTICE: Do not let brake fluid remain on a painted surface. Wash it off immediately. 1. FILL BRAKE RESERVOIR WITH BRAKE FLUID Check the fluid level in the reservoir. If necessary, add brake fluid. 2. BLEED MASTER CYLINDER HINT: If the master cylinder was disassembled or if the reservoir becomes empty, bleed the air from the master cylinder. (a) Disconnect the brake tubes from the master cylinder. Use a container to catch the brake fluid. (b) Slowly depress the brake pedal and hold it.