Nissan 47210-1Z860 Booster Assy-Brake

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Depress the brake pedal several times with the engine off and make sure there's no change in the pedal reserve distance. Depress the pedal and start the engine. If the pedal goes down slightly, operation is normal. Start the engine and turn it off after one or two minutes. Depress the brake pedal slowly several times. If the pedal depresses less each time, the booster is airtight. Depress the brake pedal while the engine is running, then stop the engine with the pedal depressed. If there's no change in the pedal reserve travel after holding the pedal for 30 seconds, the booster is airtight. Remove the master cylinder, apply about 20in-Hg of vacuum to the brake booster with a hand-operated vacuum pump, push in on the output rod with approximately 4-1/2 pounds (2kg) of force, then measure the length of the output rod and compare your measurement to the dimensions. If the rod length is outside specifications, turn the adjusting screw on the end of the output rod until the length is correct. To replace the power brake booster, remove the brake master cylinder, disconnect the vacuum hose leading from the engine to the booster, remove the under-dash panel, remove the clevis pin retaining clip with pliers and pull out the clevis pin, remove the four nuts holding the brake booster to the fire wall, slide the booster straight out from the firewall until the studs clear the holes, and measure the distance between the power brake booster and the hole in the clevis and compare it to the booster-to-clevis dimension. If it isn't the same, loosen the adjusting nut and turn the clevis in or out to the specified length, then tighten the nut.