Jamar 5x205 Billet Ball Joint Disc Brake Kit - JDB300VWB. Jamar 5x205mm billet ball joint front disc brake kit. This custom front disc brake kit features 10 inch rotors, billet 2 piston caliper with pads, bearing races, seals, brackets and center caps. Adds a custom billet front brake kit to your ball joint VW front end. Compatible with ball joint Beetle and dune buggies using ball joint front beams.