My brake pedal is pretty low and lots of pressure is needed to stop the car. I am replacing the 4 rotors (very beat) and brake pads on each of the calipers. Based on wear patterns on the rotors I do not think the calipers are hung or need replacement. Should I just replace the master cylinder while I'm at this job? The car has 204K and as far as I know the MC never been worked on. Looks easy to do, a bit expensive, but it is brakes after all.
Thanks.

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1985 300D 197K - Semi-Daily Driver Diesel
1998 Volvo V70 AWD 226K - Daily Driver 2
1998 Volvo S70 140K - Wife's DD
2003 GMC Sonoma ZR2 Option - Rusty Truck
THE BABY 1958 220S Sedan 66K All original, never restored and never will be.