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I have reason to believe (based on appearance) that the wrong brake master cylinder is installed on my '81 coupe. It appears that the correct one has a rounded reservoir and mine is squared off. (see photo). Now based on repair receipts, this m/c was replaced by the PO and has been on the car for 17 years and 23,000 miles. The brake pedal pressure seems normal and I can lock up all 4 wheels. I have read discussions regarding 1 1/8 inch m/c bores versus 1 inch bores, but remain confused. Question: Should I keep things as they are or order a new correct master cylinder for power brakes ?? What difference might I see with the correct master cylinder??
Are there any stampings on the cast iron with a number or name of manufacturer?
Unless you have a desire to make it more original, no reason to change it.
Incorrect Master Cylinder ??
