Audi TT Brake Pedal Vibration Points to Worn Rotors

I had a similar issue with my 2016 Audi TTS last year. I have some experience working on cars but mainly rely on professional mechanics for complex brake system repairs. The symptoms you describe sound very familiar. In my case, the vibration through the brake pedal was caused by a combination of worn brake rotors and an electrical issue causing undervoltage in the brake control module. The uneven wear on the disc brakes was actually a secondary problem stemming from the electrical fault. The repair involved: Testing the electrical system, Replacing the voltage regulator, Installing new brake rotors and brake pads, Bleeding the hydraulic brakes Total cost was around 240 Euro for parts and labor. The workshop identified the undervoltage issue using diagnostic equipment, which was affecting the brake calipers performance and causing uneven wear. To better assist with your specific situation, could you provide: Any warning lights on the dashboard? Does the vibration change with vehicle speed? Have you noticed any electrical issues like dim lights or slow starter? When was your last full brake system inspection? This information would help determine if your issue is similar to what I experienced or if it might be something different.

Thanks for that information. For additional context: latest service was at 132000km, and currently at 135344km. Indeed, no warning lights showing on the dash. Had the electrical system tested and all voltages are within spec. The brake pedal vibration seems most noticeable between 80-120km/h during moderate braking. Got a second opinion from another workshop who suggested the brake rotors are likely warped from heat cycling. They recommend replacing both brake rotors and brake pads as a complete set. The metal brakes have developed visible scoring marks and uneven wear patterns. Workshop quoted 380 Euro for parts plus labor. Would be helpful to know if anyone has experience with aftermarket vs OEM brake components for the TT platform.

Having gone through similar brake system issues with my TTS, I can confirm that warped rotors often cause these symptoms, especially the speed-dependent vibration you are experiencing. The scoring marks you mention are a clear indicator of disc brake wear beyond normal limits. While my initial repair included the electrical component, your case seems more straightforward, classic brake rotor and pad wear. Since your voltages check out, focusing on the mechanical components makes sense. Regarding OEM vs aftermarket: After my initial repair, I later switched to aftermarket brake rotors from a reputable manufacturer. They performed well but lasted about 15000km less than the original equipment. The slight cost savings did not justify the shorter lifespan of the aftermarket parts. The 380 Euro quote for OEM parts and labor is reasonable. Make sure they flush the brake fluid while doing the work, fresh fluid makes a noticeable difference in pedal feel with these hydraulic brakes. Important maintenance tip: After installation, follow proper break-in procedures for the new components. This helps prevent uneven wear patterns from developing again. The proper bedding process for new brake components on these cars typically involves: Several moderate stops from 60km/h, Gradual cool-down period, Avoiding hard braking for the first 200km

Thanks for the detailed feedback. After considering all the input and advice, I have decided to proceed with OEM parts for the brake system repair. The workshop quote of 380 Euro seems fair given the comprehensive nature of the work involved. The symptoms match exactly what others have described with warped brake rotors, especially the speed-dependent vibration during moderate braking. The scoring on my current brake rotors and the irregular wear patterns clearly indicate its time for replacement. I appreciate the insights about aftermarket vs OEM components. While aftermarket brake pads and rotors might save some money upfront, the shorter lifespan makes OEM more cost-effective in the long run. Plus, with squeaky brakes being a common complaint with some aftermarket parts, I would rather stick with components designed specifically for the TT. Will definitely have them do a complete brake fluid flush while they have the system apart. Planning to schedule the repair next week and will make sure to follow the proper break-in procedure for the new brake components. The maintenance tip about proper bedding of new brakes through gradual stops and avoiding hard braking initially is particularly helpful.