Wilwood’s new GS Compact Integral Master Cylinders are an all new rebuildable design featuring a high pressure die cast aluminum body with a protective e-coat finish. Integral cylinders feature a positive seal internal bellows cap. Internally, a refined return spring and piston assembly assures positive pressure control along with a quick and complete release. Wilwood’s new 3/4 Inch bore GS Compact Integral Master Cylinders are an all new re-buildable design featuring a high pressure die cast aluminum body with a protective e-coat finish. Integral cylinders feature a positive seal internal bellows cap. Internally, a refined return spring and piston assembly assures positive pressure control along with a quick and complete release.