Audi Q4 e-tron Brake Pedal Issues Need Urgent Fix

I had a very similar brake pedal issue with my 2019 Audi Q8 e-tron last winter. Having some experience with basic car maintenance, I first suspected low brake fluid too, but it turned out to be more complex. The workshop diagnosed worn brake pads and partially corroded brake rotors, which were causing the spongy pedal feel. The entire hydraulic brake system needed a thorough inspection. They found that moisture had entered the brake fluid, degrading its performance. The repair included: Complete brake fluid replacement, New brake pads, Brake rotor resurfacing, Master cylinder inspection Total cost came to 480 Euro and fixed the inconsistent pedal feedback completely. The brake system now works perfectly with firm, predictable pressure. Before suggesting specific solutions for your Q4, could you share: Current mileage, When you last had a brake fluid change, Whether you notice any grinding sounds while braking, If the brake warning light has come on This information would help determine if youre dealing with a similar issue or something different.

Thanks for the detailed feedback about brake servicing. At 9250 KM since my last service, I notice the spongy brake pedal feedback is getting worse. The warning light hasnt illuminated yet, but Im concerned about the hydraulic brakes system performance declining this quickly in my Q4. After reading about your experience, I should probably get a complete brake inspection rather than just topping up the fluid. The inconsistent pedal pressure seems very similar to what you described. No grinding sounds yet, but I want to address this before it potentially becomes a bigger issue. The brake pedal behavior definitely matches the symptoms you mentioned with your corroded rotors, though my vehicle is still relatively new. Guess its time for a proper check of the entire brake system.

Thanks for the update on your Q4 brake situation. The similarities to my experience are concerning, especially given your relatively low mileage. When my brake system issues started, I initially hesitated to get a full inspection, thinking the low mileage meant it couldnt be serious. That was a mistake. The brake fluid contamination in my case developed regardless of mileage. The absence of a brake warning light and grinding sounds is somewhat reassuring, but the worsening pedal feedback definitely warrants immediate attention. In my case, waiting longer would have risked more extensive damage to the master cylinder. My recommendation, based on dealing with nearly identical symptoms: Get a complete brake inspection now, Have them pressure test the brake lines, Request a brake fluid quality check, Consider a preventive fluid flush Even if its just contaminated fluid like in my case, addressing it early prevented more costly repairs. The entire brake system inspection ended up being worth every cent for the peace of mind and restored braking performance. Let us know what the workshop finds. With these brake system issues, its helpful to share experiences so others can identify similar problems early.

Thanks everyone for sharing your brake system experiences. Just wanted to provide a quick update, I took my Q4 to the workshop yesterday based on the advice here. The hydraulic brakes inspection revealed contaminated brake fluid was indeed the main culprit, just like suggested. The total repair included a complete brake fluid replacement and thorough inspection of the brake lines and master cylinder. Final cost was 320 Euro, which seems reasonable. The spongy brake pedal issue is now completely resolved, the pedal feels firm and consistent again. Really glad I didnt just try topping up the fluid myself. The technician mentioned catching this early likely prevented damage to other brake components. For anyone else experiencing similar brake pedal feedback issues, definitely worth getting the full system checked rather than assuming its just low fluid. Thanks again for helping me avoid a potentially bigger problem down the road. The car brakes are working perfectly now with proper pedal pressure restored.