Sebring Brake Booster Sensor Causing Soft Pedal Issues

I had a similar issue with a Stratus 2003, which shares many brake system components with your Sebring. Having some experience with brake-related problems, I can share my troubleshooting journey. The symptoms you describe match what I experienced, a soft brake pedal and increased pressure requirements. Initially, I thought the brake booster was failing, but the actual problem was much simpler. After taking it to my regular workshop, they discovered the brake system was improperly bled, causing air pockets in the hydraulic lines. The repair involved a complete brake system bleeding using professional diagnostic tools to ensure all air was removed. The total cost was 90€, which included a thorough ABS system check. The vehicle safety inspection also confirmed no other issues with the brake components. To provide more specific advice for your situation, could you share: Have you noticed any changes in brake fluid level? Are there any specific conditions when the brake pedal feels worse? What exact fault codes is your system showing? These details would help determine if your issue matches my experience or if the brake booster pressure sensor truly needs replacement parts. After proper bleeding, my brake pedal returned to normal firmness, and all warning lights cleared. The repair has held up perfectly since then.

Last service was done at 171959KM, and after reviewing multiple responses, I checked the brake fluid reservoir and found it at minimum level. When adding fresh fluid, I noticed it was dropping gradually, suggesting a potential leak in the system. The ABS system warning persists even after topping up the fluid. I will have a professional mechanic perform a thorough inspection with proper diagnostic tools, focusing on both the brake booster and potential leaks in the hydraulic lines. Vehicle safety is not something to compromise on, especially with brake issues. The fault codes mentioned earlier are P0571 and P0573, which do point toward brake switch and brake booster pressure sensor issues. Will post an update once replacement parts are installed and tested.

Thanks for the update on your Sebring brake performance issues. Our cars being similar models, I had actually forgotten to mention that I also experienced fluid loss before my complete system check. The fault codes P0571 and P0573 are indeed significant and match my diagnostic results from back then. However, the gradual fluid drop you noticed is particularly concerning, this wasnt present in my case and suggests you might be dealing with a more complex issue than just the brake booster pressure sensor. After my complete brake system service, I learned that these fault codes can sometimes be misleading. While they point to the brake switch and sensor, the underlying cause could be: Damaged brake lines causing pressure loss, Faulty master cylinder seals, Caliper leaks affecting brake pedal response The dropping fluid level definitely requires immediate attention. My suggestion, based on my repair experience, would be to: 1. Have the entire brake system pressure tested 2. Get the ABS system fully diagnosed 3. Check all brake line connections The repair might end up being more extensive than initially thought, but proper diagnosis will prevent replacing parts unnecessarily. Keep us updated on what the inspection reveals.

Thanks for the detailed follow-up information. After having a professional inspection done today, you were right about the complexity of the issue. The dropping brake fluid level led us to discover a small leak at the master cylinder, which explains both the fluid loss and the soft brake pedal feel. The diagnostic tools confirmed both fault codes, but the mechanic explained that the brake booster pressure sensor issues were actually triggered by the inconsistent pressure from the leaking master cylinder. This explains why the ABS system warning persists. Current repair plan: Replace master cylinder (280€ parts and labor), Full brake system bleeding, Testing brake booster and pressure sensor after the main repair The brake pedal response should return to normal once the master cylinder is replaced and the system is properly bled. A retest with diagnostic tools will verify if the initial fault codes clear up as expected. Will need to delay my next project to cover these repairs, but with the brake system involved, its worth getting it done right. Waiting for parts to arrive next week. Thanks for helping pinpoint the actual problem.