1969 1968 Chevelle, GM A-body Master Cylinder Lines - Power Disc Brakes This set of lines run from the master cylinder to the the metering valve down on the frame. Also included is the short line to the hold off valve. These are for cars with factory disc brakes (not aftermarket setups). Replace those old nasty ones on your car today! This line set is in original material.(tin coated steel with the correct colored fittings just like the originals). These lines are manufactured by Inline Tube - the brake and fuel line experts.