Master Cylinder Repair Kit - 14mm 76-80
The old ATE master cylinders, being out of sight and out of mind under the fuel tank, were often neglected. They are made of cast iron and susceptible to corrosion. If you are lucky, all you will need is a repair kit to revive your master cylinder. For best results, hone the cylinder with a flex hone of the appropriate size. If the pitting is too deep, a good local machinist can insert a stainless steel sleeve and save the part.
There are three sizes. The size should be stamped on the body of the master cylinder. Locate that before ordering to ensure that you get the correct kit.
Equivalent to BMW part number 34 31 1 234 926 (34311234926)