I also need to know how to bleed the master cylinder once it's already fitted. My friend owns a lexus and we're not sure if the dealer bench bled the master cylinder before replacing it. will the air in the m/c eventually leave the system through bleeding the system from the callipers ? or will it be left trapped unless the m/c is bled on it's own ?

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.