Agreed. Did a Summit brand booster and master disc kit. Had the GM master and had problems with brake drag to the front discs.Front and rear reservoir same size.BUT,,
Guess what. Had a residual valve in it. Also got a master for a 78 Chevy Malibu disc brake car and it had same size reservoir front and rear. Gotta be careful with aftermarket parts.You never know what you will get.
