Stelvio Brake Failure: Booster Sensor Issues Alert

Had a similar issue on my Giulia diesel from around the same period. With some experience working on cars, I learned that brake performance issues often need proper diagnostic tools to pinpoint the exact problem. Initially thought it was the brake booster, but it turned out the brake system was incorrectly bled, causing air pockets. This created a spongy brake pedal feel and reduced vehicle safety. The workshop found this during their inspection and properly bled the system, which resolved the warning messages and restored normal brake pedal feel. Total cost was 90 Euro for the complete brake bleeding service. The stored error codes cleared after the repair and havent returned since. Before suggesting more specific solutions, could you share: Build year of your Stelvio, Current mileage, When did you last have brake maintenance, Does the pedal feel spongy or completely hard, Any unusual sounds when pressing the brake pedal This information would help determine if your issue matches what I experienced or if its something different with your brake system.

Just had my last service at 85000 KM, and running on 86754 KM now. The pedal feels spongy, exactly as you described, and makes a slight hissing sound when pressed. The issue started appearing gradually over the past few weeks. I will schedule a brake system inspection since the symptoms match your experience. Thanks for mentioning the bleeding service, this could help avoid unnecessary parts replacement and keep repair costs reasonable. The pressure sensor codes now make more sense given your feedback about air in the brake lines affecting brake performance. While my vehicle safety systems remain functional, I agree its best to address this promptly.

Thanks for providing those details. The symptoms you describe, especially the hissing sound and spongy pedal, are remarkably similar to what I experienced with my Giulia. The gradual onset matches my situation perfectly. When air enters the hydraulic brakes, the pressure sensor can trigger fault codes because it detects inconsistent brake pressure readings. This explains why you are getting error messages without a complete brake system failure. After my brake bleeding service, I noticed these improvements: Pedal feel became firm and predictable, Warning messages disappeared, Brake performance returned to normal, Hissing sound completely resolved Since youre at 86754 KM, its the right time to address this. The ABS system might seem fine, but air in the lines can affect its efficiency during emergency braking situations. Quick tip: When booking the service, request they check the brake fluid quality too. Contaminated fluid can cause similar symptoms and might need changing if it hasnt been done during recent maintenance. The repair should cost around 90-120 Euro depending on whether they need to replace any brake fluid. This preventive maintenance helps avoid more expensive replacement parts later.

Thanks to everyone who responded. Based on your feedback and my research, the diagnosis points to air in the brake lines affecting my brake performance. The similar stories and matching symptoms really helped confirm my suspicions. Spoke with my regular workshop and booked a brake system inspection and bleeding service for next week. They quoted 110 Euro including fresh brake fluid, which seems reasonable. The diagnostic tools should help verify whether the air pockets are causing the pressure sensor readings to fluctuate. While its reassuring that the ABS system remains operational, I agree with taking care of the hydraulic brakes promptly rather than risk further issues. Will update once the service is complete to confirm whether this resolved the warning messages and restored proper brake pedal feel. Really appreciate the detailed responses and maintenance tips. This forum continues to be incredibly helpful for identifying problems and finding cost-effective solutions without jumping straight to replacement parts.