Brembo KT04221 OE Rear Disc Brake Kit 2000-2006 Audi TT Quattro Low-Met Pads

The Brembo KT04221 is an OE-quality rear disc brake kit for 2000 to 2006 Audi TT Quattro models including Base, ALMS Edition, and Special Edition trims. The KT04221 pairs Brembo's Prime Low-Met brake pads with Brembo's high-carbon cast iron rotors, delivering a complete rear brake replacement that meets or exceeds original equipment stopping performance. Brembo's Prime Low-Met pad formulation focuses on performance through patented friction solutions and full accessory hardware, with production processes controlled end-to-end to bring the pad as close to OE performance characteristics as possible while offering a performance-oriented compound choice for drivers who want a firmer pedal feel and stronger initial bite compared to ceramic alternatives.

The high-carbon cast iron rotors in the KT04221 use the same alloy materials Brembo supplies to original equipment manufacturers, ensuring proper dimensional fitment and thermal behavior. The higher damping coefficient of Brembo's high-carbon rotor alloy reduces brake noise and vibration, improves heat transfer away from the braking surface, and shortens rotor cooling times during repeated braking events. All installation hardware required to complete the rear brake job is supplied in the KT04221 kit.

KT04221 Key Features

• Complete rear disc brake kit for 2000 to 2006 Audi TT Quattro
• Brembo Prime Low-Met pads for performance-oriented friction characteristics
• Patented friction formulation with full production control to match OE performance
• High-carbon cast iron rotors using the same alloy as OE production
• Higher damping coefficient for reduced brake noise and improved heat transfer
• All installation hardware included
• Meets or exceeds OE stopping performance standards
• Direct fit, no modifications required

Vehicle Fitment

Product Specifications

What's Included

• 2x Brembo high-carbon cast iron rear brake rotors
• 1 set Brembo Prime Low-Met rear brake pads
• All necessary installation hardware

Installation Notes

The KT04221 is a direct bolt-on rear brake replacement for 2000 to 2006 Audi TT Quattro. The rear caliper on the TT Quattro uses a rotating piston design that requires a brake caliper wind-back tool for pad installation. Do not use a standard C-clamp to compress the rear pistons. Clean all rotor contact surfaces with brake cleaner before installation. Torque caliper carrier bolts to OE specification. Bed the new pads and rotors through a series of moderate stops from progressively higher speeds before any aggressive braking to ensure even pad transfer and maximum stopping performance.

Frequently Asked Questions

What vehicles does the Brembo KT04221 fit?
The KT04221 fits 2000 to 2006 Audi TT Quattro rear brakes, including Base, ALMS Edition (2002), and Special Edition (2006) trims.

What type of brake pads are included in the KT04221?
The KT04221 includes Brembo Prime Low-Met pads. Low-met pad compounds use a small percentage of metallic content blended into the friction material to provide a firmer initial bite and stronger heat tolerance compared to pure ceramic formulations, while still maintaining acceptable noise and dust levels for street driving.

What is the difference between the KT04221 and the KT00572?
Both kits fit the same 2000 to 2006 Audi TT Quattro rear brake application and include the same high-carbon cast iron Brembo rotors. The KT04221 (this kit) includes Prime Low-Met pads for a performance-oriented friction characteristic. The KT00572 includes Prime Ceramic pads, which prioritize low dust output and quiet operation. Choose the KT04221 for a firmer pedal feel and stronger initial bite, or the KT00572 for a cleaner, quieter daily driver experience.

Does the KT04221 include rotors and pads?
Yes. The KT04221 is a complete rear disc brake kit that includes both Brembo high-carbon cast iron rear rotors and Brembo Prime Low-Met rear brake pads along with all required installation hardware.

Is the KT04221 a direct OE replacement?
Yes. The KT04221 is engineered to the same dimensional specifications as the original Audi TT Quattro rear brake components. No modifications are required for installation.

Why does Brembo use high-carbon cast iron for its rotors?
High-carbon cast iron provides a higher damping coefficient than standard cast iron, which reduces vibration and noise during brake application. It also conducts heat more efficiently, allowing the rotor to move thermal energy away from the braking surface faster, improving fade resistance and shortening cooling times during repeated stops.

What is the warranty on the Brembo KT04221?
The KT04221 is covered by Brembo's limited warranty against defects in materials and workmanship. As a brake component, the Magnuson-Moss Warranty Act provides federal consumer protections that prevent vehicle manufacturers from voiding warranty coverage on unrelated components due to the use of quality aftermarket brake parts.

Do I need a special tool to install the KT04221?
Yes. The Audi TT Quattro uses rear calipers with rotating pistons that require a brake caliper wind-back tool. A standard piston compression tool or C-clamp will damage the rear caliper pistons. A wind-back tool is required for this and most European rear brake installations.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov.