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30% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

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Receive Up To 30% Off Your Online Purchase Of Select Parts And Accessories
Use promotional code MMJ30 at checkout to receive 30% off the following categories: Select Brake Parts, Select Hi-Performance and Truck Accessories, Batteries, Water Pumps, Belts, A/C Parts, Starters, Alternators, Fuel Pumps, Radiators, Radiator Fans, Thermostats, Caps & Clamps, Clutches, Spark Plugs, Plug Wires, CV Axles, Battery Chargers & Booster Cables, OE Locks, Rack & Pinons, Window Motors, RainX Wipers, Appearance Chemicals, Car Wash Accessories, Floor Mats, Lift Equipment, Hand Tools, Travel Accessories, Car Covers, Seat Covers, Wheel Covers, Body Repair, Collectibles and Apparel.

Use promotional code MMJ20 at checkout to receive 20% off the following categories: Ignition, Chassis, Shocks & Struts, Outdoor Lifestyle, Towing, Air Filters, Oil Filters, Bearings & Seals and Engine Parts.

Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes the following brands: Champion, Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner, Philips and BBK Performance. Valid online until 11:59 PM EST on 10/1/17.

Receive 25% Off Wagner branded brake parts with your online purchase. Use promotional code: WAGNER25.

Receive 10% Off Select Champion, MOOG and FelPro branded products with your online purchase. Use promotional codes: CHAMP10, MOOG10 and/or FELPRO10.


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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 fl ow 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 fl uid
  • Worn out piston seals

What are the Symptoms of Failure?

  • One of the brake pads are 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?