Master Cylinder: 69-74 era Disc/Drum w/ BleedersBrand New Tandem brake master cylinder with Bleeders built in. to suit DISC BRAKE front end. Most disc brake conversion kits for disc drum. Shallow bore. Use this kit also when using GM USA single piston Calipers right back to 1955 era. Not for Disc Rear cars This is a Brand new reproduction with the BLEEDERS out the top .. as were many years of the GM disc Drum cars of the 69 74 era. can be used up to 1980 if wanted. Not for Turbo or disc Disc use..