Vehicle Information Fitment:

 

2002-2004 Audi A6 (321 mm Disc Brakes; w/ Dual Piston Caliper)
2000-2004 Audi A6 Quattro (321 mm Disc Brakes; w/ Dual Piston Caliper)
2001-2003 Audi A8 Quattro (323 mm Disc Brakes)
2001-2005 Audi Allroad Quattro (w/ Dual Piston Caliper)
2000-2001 Audi S4
2002-2003 Audi S6 (321 mm Disc Brakes; w/ Dual Piston Caliper)
2002-2004 Volkswagen Passat (321 mm Disc Brakes; Does not fit W8 4.0L W Model)
2002-2004 Volkswagen Passat (W8 4.0L W Model)
2005 Volkswagen Passat (w/ Dual Piston Caliper)

 

Package Include:

 

1Pcs Brake Calipers 

 

Steps to replace a brake Caliper:

 

If you are comfortable with car repairs and have the necessary tools, you can replace the brake caliper yourself. The process might vary slightly for different makes and models. Here are the general steps to replace a brake caliper. 
1. Lift the vehicle
Use the lug wrench to loosen the lug nuts on the tire and then use the jack to lift the vehicle off the ground. Secure the vehicle with jack stands.
2. Remove the tire
Use the lug wrench to remove the lug nuts and then remove the tire from the vehicle.
3. Remove the caliper mounting bolts
Use the brake caliper tool to remove the caliper mounting bolts that hold the caliper in place.
4. Remove the caliper
Once the mounting bolts are removed, gently pry the caliper off the brake rotor. Be careful not to damage the brake hose as you remove the caliper.
5. Install the new caliper
Place the new caliper over the brake rotor and secure it in place with the caliper mounting bolts. Torque the bolts to the manufacturer’s recommended specifications using a torque wrench.
6. Install the tire
Replace the tire and lug nuts, torque to spec, and then lower the vehicle off the jack stands.
7. Bleed the brake system
Use a brake bleeding kit to remove any air from the brake system. This is an important step to ensure that the brakes are working properly. Continually top up the fluid in the reservoir as you bleed the brakes.
8. Test the brakes
Once the brake caliper is installed and the brake system has been bled, test the brakes to ensure they are functioning properly.

Construction of Brake Calipers:

1:Caliper Housing: The caliper's main body houses the other components and encloses the brake pads and rotor.
2:Pistons: These are cylindrical components located inside the caliper housing. When hydraulic pressure is applied, the pistons extend outward to push the brake pads against the rotor.
3:Seals and Dust Boots: These ensure a tight and reliable seal around the pistons, protecting them from dirt and contaminants. Proper seals are vital to prevent brake fluid leaks and maintain hydraulic pressure.
4:Brake Pad Clips: These clips securely hold the brake pads within the caliper.
5: Bleeder Screw: A small screw used to release air and excess brake fluid from the caliper during brake bleeding procedures.

Different Types of Brake Calipers:

1:Floating Calipers: Floating calipers are the most common type used in modern vehicles. They have one or two pistons on one side of the rotor. When the brakes are applied, the caliper slides inward, causing the piston(s) to press the brake pads against the rotor. Floating calipers are relatively simple and cost-effective, widely used in various vehicles.
2:Fixed Calipers: Fixed calipers have pistons on both sides of the rotor, providing more even pressure distribution and improved braking performance. Unlike floating calipers, fixed calipers do not slide; they remain stationary during braking. This design reduces caliper flexing and ensures a more consistent brake pad-to-rotor contact.
3:Sliding Calipers: Sliding calipers are also known as pin-slide calipers. They have one or two pistons on one side of the rotor, similar to floating calipers. However, sliding calipers use pins or sliders to allow the caliper to move back and forth slightly during braking. This design helps equalize pressure on both sides of the rotor and promotes even brake pad wear.