Brake Caliper Pistons
Brake caliper pistons are usually hard chromed steel, although some manufacturers use aluminium alloy or phenolic pistons. Remember, the piston surface seals the brake caliper, the piston should be in like-new condition. If the piston is pitted or scored, it should be replaced.
Phenolic pistons are composite plastic, they are mold pressed, heated, and molded into shape.
They do not rust, are not affected by heat or moisture in the brake system, do not transfer heat to the brake fluid and are much lighter than steel. They are used in various OE applications.
Buy from our eBay shop
The piston on the right is a Frentech “Hard chromed” piston, manufactured to exceed Original Equipment specifications, increase durability and improve service life.