SRX Brake Performance Drop: Bad Pressure Sensor Alert

I had a similar issue with my 2007 Cadillac CTS with comparable brake system problems. With moderate car repair experience, I can share some relevant insights. The symptoms you describe match what I experienced, reduced braking power and ABS warnings. Initially thought it was the brake booster, but the actual problem was much simpler. The workshop discovered the brake system was bled incorrectly during previous maintenance. The repair involved: Complete system diagnosis using specialized diagnostic tools, Proper bleeding of the brake system, Verification of pressure sensor functionality, Testing all brake components for vehicle safety compliance Total cost was 90€ for labor and materials. The fix restored normal brake operation and cleared all error codes. Before suggesting more specific solutions, could you provide: Current mileage, When was the last brake service performed, Are you experiencing any unusual sounds while braking, Does the brake pedal feel different when engine is off vs running, Any recent brake-related repairs This information would help determine if your issue is similar and whether the brake booster pressure sensor is actually the culprit.

Latest service was done at 38500 KM and included brake fluid change. Thanks for sharing your experience with a similar problem. The pressure sensor behavior you described matches what Im seeing. I havent noticed any unusual sounds, but the brake pedal does feel significantly different when the engine is off. The problem started gradually rather than suddenly, which made me think its more likely a sensor issue than air in the brake lines. I will get it properly diagnosed at a shop that specializes in hydraulic brakes and brake performance testing. Better safe than sorry with brake issues. Would appreciate if others could share typical repair costs for pressure sensor replacement parts on these models. My brake pedal response is still reliable enough to drive safely to the shop, but Im not putting it off too long.

Thanks for the additional details. The gradual onset you described definitely aligns with my experience of sensor degradation rather than air in the lines. When my brake pedal showed similar behavior between engine on/off states, it led to a full diagnosis. In my case, the brake booster pressure sensor replacement ended up costing 280€ for the part and about 150€ for labor. The workshop also recommended a brake fluid flush while the system was open, adding another 60€ to the total. The replacement restored proper brake performance and eliminated all error codes. Most importantly, the brake pedal feel returned to normal both with engine running and off. Having experienced both scenarios, improper bleeding and sensor failure, your symptoms point more toward the pressure sensor. The gradual performance decline is a telltale sign. Since your brake pedal is still providing reliable response, driving to the shop should be safe, but I would avoid any unnecessary trips until the hydraulic brakes are fully serviced. The sooner the repair is completed, the less risk of additional brake system components being affected. Would be interested to hear what your shop diagnosis reveals. These pressure sensor issues are fairly common on our model years after about 35000-40000 KM.

Thanks for providing all those details on repair costs. Youre right about getting it checked soon, I scheduled an appointment for next week. The gradual decline in brake performance matches exactly what youre describing with the pressure sensor issue. The pricing you shared helps set reasonable expectations. Good to know a complete fix including parts, labor, and fluid change would likely run around 500€. Thats actually less than I feared when the diagnostic tools first showed those error codes. Makes sense about minimizing driving until the repair. The brake pedal response is still predictable, but Im sticking to essential trips only. Vehicle safety comes first, and I dont want to risk damaging other brake system components. Will update the forum once I get the official diagnosis and repair completed. This thread should help others who run into similar pressure sensor problems with these models at similar mileage points.