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Up to 25% Off Online Orders of Select Parts & Accessories. Enter Promo Code MMJ25 in Cart.

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Receive Up To 25% Off Your Online Purchase Of Select Parts and Accessories Instantly

When items are added to the cart, the discount will automatically deduct off the price of the qualifying items. Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installation, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes select products, items already on sale and MAP priced brands & items. For full category inclusions and disclaimers, See Details Here. Valid online until 11:59 PM EST on 5/31/18.

Additional Promotions Not Included in the above:

Receive 10% Off Select Wagner branded brake parts with your online purchase. Use promotional code: WAGNER10.

Receive 10% Off Select Champion branded products with your online purchase. Use promotional code: CHAMP10.

Receive 10% Off Select FelPro branded products with your online purchase. Use promotional code: FELPRO10.

Caliper Pistons


Caliper Pistons

Brake calipers are an essential component of your overall brake system, and the piston is the key component of the brake caliper. Pistons are responsible for forcing the brake pads to make contact with the brake rotor to bring your vehicle to a stop.

What are Caliper Pistons and how do they work

How Does it Work?

  • A brake caliper operates using 1, 2, 4 or 6 pistons
  • Single piston designs allow the caliper to center during application so that the brake pads have equally applied force
  • Dual, 4 or 6-piston calipers apply hydraulic force from both sides of the caliper
  • Once the brake pedal is pressed, it forces the brake fluid to flow through to the caliper
  • The piston(s) then move outward and make contact with the brake pads which then stops your vehicle by creating friction between the brake pads and rotor

How is it Made?

  • Molded using steel or phenolic material
  • Cylindrical in shape
  • One end open, one closed

Why Does it Fail?

  • Rust and corrosion
  • Old or contaminated brake fluid
  • Worn out piston seals

What are the Symptoms of Failure?

  • One of the brake pads is more worn down than the other
  • Your vehicle may pull to one side when steering
  • A wet caliper or brake pads indicate a leaking caliper, typically from the piston seal

What are the Implications of Failure?