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Adjusting the Master Cylinder Rod
An often overlooked step when replacing the master cylinder. Nine times out of ten it is OK. I have had to adjust a few. If there is no free play, the fluid will expand and apply the brakes. If your brake mechanic is familiar with old brake systems, this won't be the first time he has had to adjust one. I have attached a picture of the service manual page on the Master Cylinder. Note the adjustment at the bottom of the paragraph.
Just a thought. Definitely should be checked.