Is there a way to check the Master Cylinder for the brakes while it is still on the car? My brake pedal travels way too much before the brakes start to grab. Panic braking doesn't make the car pull excessively to either side. Wheels will lockup.
I am suspect of my calipers as I can't find any leaks at the master cylinder. Calipers are old and rusty, pads still have good meat on them. I am planning to replace all 4 calipers with the Nugeon rebuilts from here. Should I just do the MC anyway? 199K miles but sits for 2~3 months at a time. Fluid is clean as I did a full flush when I changed my rear pads last year. I was hoping pedal would improve as the rears settled in, but no improvement after 3~4K miles.
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.