Audi Audi S4 2003-2008 Brakes Specifications

The 2003-2008 Audi S4 features front ventilated discs measuring 321mm in diameter and rear ventilated discs at 310mm. The braking system includes dual-circuit ABS with electronic brakeforce distribution (EBD) and optional Audi's Electronic Stabilization Program (ESP). Brake pads are designed for high-performance use, with compatible part numbers including 8E0615601A for front pads and 8E0615602A for rear pads. Ensuring compatibility with your specific model year and trim is essential for proper function and safety.

Regular brake maintenance for the 2003-2008 Audi S4 includes inspecting brake pads every 10,000 to 15,000 miles, replacing them when worn below 3mm, and checking rotors for warping or excessive wear. Brake fluid should be replaced every 2 years or 24,000 miles, using Audi-approved DOT 4 fluid. Additionally, the ABS and ESP systems should be checked annually or if a warning light appears. Always refer to your owner's manual for specific recommendations.

To replace the brakes on a 2003-2008 Audi S4, start by safely lifting the vehicle and removing the wheels. Remove the caliper bolts and slide the caliper off the rotor, taking care not to damage the brake hose. Remove the old pads and install the new ones, ensuring proper alignment. Replace the rotor if necessary, and reinstall the caliper. Tighten all bolts to the specified torque (approximately 40 Nm for caliper bolts). Bleed the brake system if new pads or rotors are installed to remove any air in the lines. Test the brakes thoroughly before driving.

Common brake issues on the 2003-2008 Audi S4 include spongy brake pedals, grinding noises, or ABS warning lights. Start by checking brake fluid levels and condition, topping off or replacing as needed. Inspect pads and rotors for wear, and look for signs of contamination from oil or grease. If the ABS light is on, use an OBD-II scanner to check for fault codes. Grinding noises may indicate worn pads or warped rotors, requiring replacement. Always test the brakes in a safe environment after any repairs.

To optimize brake performance on a 2003-2008 Audi S4, use high-quality, Audi-approved brake pads designed for performance driving. Ensure proper cooling by cleaning brake dust from the wheels and rotors regularly. Upgrade to slotted or drilled rotors for improved heat dissipation and reduced fade. Consider flushing and replacing brake fluid with a high-performance DOT 4 fluid. Finally, maintain proper tire pressure and alignment to ensure even braking performance.