Master cylinder upgrade

[rs657f]

I was reading on a forum that if I change out the master cylinder on my 96 tahoe 2wd to a master cylinder for a 2500HD/3500 of the same gen that it would get rid of that spongy brakes?

 

[rs657f]

?

 

[SunlitComet]

does not get rid of spongy really. sponginess is more like air in the system. but if the volume of fluid is increased over the old mc on a given piston stroke it can push the wheel piston farther that it requires less stroke of the pedal.

 

[Phone Man]

I did it and i found no improvement in braking. In fact, it felt worse to me. Only after replacing the rear drum harware and the correct mc did it feel better than before