Service a sticking or worn front caliper with the Carlson Brake Caliper Piston 7768. This is the component that turns hydraulic brake pressure into the force that presses the pad against the rotor. It is listed for many models from one make, among them the 1994-1998 Audi Cabriolet, 1995-1997 Audi S6 and 1993-1995 Audi 90.
Inside the caliper, this disc brake caliper piston moves outward in its bore each time the brake pedal is pressed, then eases back slightly on release. If the original piston is pitted, corroded or binding, replacing it is one step in servicing the caliper.
- Position: front
- Part number: Carlson 7768
- Quantity per application: varies. Most listed applications use 2, while the 1993-1995 Audi 90 lists 4.
- Engine: All, for the listed applications
Signs a caliper piston may need attention include:
- brake drag
- the vehicle pulling to one side under braking
- uneven pad wear
- one wheel running hotter than the others
These symptoms can have other causes, so diagnose the problem before replacing parts. Follow the vehicle service information for caliper disassembly, reassembly and brake bleeding. See the Buyer's Guide tab for the full list of applications.
