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Tech A says that bench bleeding a master cylinder will prevent having to bleed air from the brake lines during replacement. Tech B says that bleeding the master cylinder on the vehicle is preferred to verify brake pedal and booster operation. Who is correct?

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sqdancefan

Answer:

  Tech B

Explanation:

Bleeding the master cylinder on the bench does nothing for the air in the brake lines on the vehicle. The bench bleeding is a preferred first step, but bleeding the rest of the brake system is also required. A final check of proper operation on the vehicle should also be accomplished.

Tech B is correct.

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