Seat Alhambra Brake Booster Issue

Interesting issue! I had something similar happen with my Alhambra. I also experienced error messages and diminished braking power. It felt like the brake pedal was much harder to press, and the ABS system seemed to be acting strangely. Have you checked the brake booster pressure sensor? Sometimes those sensors can fail, especially if there's been any recent work on the brake system. If your car's engine is a heart, the brake booster is like the left ventricle's strength – if it's not getting the right signals (from a bad sensor), the whole system suffers. It's worth a check!

That's really helpful! So, when you say 'similar,' was it exactly the same symptoms? Error message on the speedometer, poor braking effect, and a stored error? Also, where exactly IS the brake booster pressure sensor located? I'm fairly comfortable with using diagnostic tools, but I want to make sure I'm looking at the right thing before I start poking around. Did you also notice anything strange with the brake pedal feel, like a vibration or unusual resistance?

Yep, pretty much the same symptoms. Error message, spongy brake pedal, and the feeling that the ABS system wasn't quite right. As for the location, it's usually mounted directly on the brake booster itself, or very close to it, in the engine bay. It's a small sensor with an electrical connector. Honestly, unless you're very confident with hydraulic brakes and ABS systems, I'd suggest taking it to a workshop with proper diagnostic tools. Incorrectly messing with the brake system can be dangerous, and they'll be able to properly diagnose and fix the issue.

Just wanted to let you know I went to a workshop with diagnostic tools, as you suggested. It WAS the brake booster pressure sensor, like you thought. The error memory confirmed it. They replaced it, the error message disappeared, and braking is back to normal. Apparently, the hydraulic brakes had been bled improperly during a previous service, damaging the sensor over time. Cost me about 90€, but it was worth it for peace of mind and proper braking! Thanks a lot for pointing me in the right direction; you saved me a lot of unnecessary troubleshooting!