Failing Brake Booster Triggers Multiple Warning Lights

Had the exact same issue with my 2019 Chevy Suburban Diesel. The brake pedal got progressively harder, and the ABS warning light started flashing intermittently. Turned out the brake system was improperly bled during routine maintenance, causing air pockets in the hydraulic brakes. The initial diagnosis pointed to the brake booster pressure sensor, but further testing revealed trapped air in the lines. The fix required a complete professional brake system flush and proper bleeding sequence. This was actually serious since air in brake lines can lead to complete brake failure. The mechanic had to use a specialized pressure bleeder tool to get all the air out, working systematically through each brake caliper. After the proper bleeding procedure, the brake pedal feel returned to normal, warning lights disappeared, and the ABS system started working correctly again. Would recommend getting a second opinion from a certified dealer, this isn't something you want a general shop guessing at, especially with the pressure sensor involvement.

Thanks for sharing your experience! I'm dealing with an eerily similar situation with my Tahoe's brake booster and warning lights. Had it checked out last week and the symptoms match exactly what you described. Quick question, do you remember roughly what the total repair cost was for the brake system flush and bleeding? Also, has everything been working properly since the fix, or have you noticed any other issues with the vehicle safety systems? Just trying to get a ballpark figure before heading to the dealer for what sounds like the same repair. Those hydraulic brakes aren't something to mess around with, especially with all these modern sensors involved.

Following up on your question, I got the brake booster pressure sensor issue fixed last week and the total came to 90 € for the complete brake system bleeding. The mechanic identified the same issue we discussed, air trapped in the hydraulic brakes from improper bleeding during earlier maintenance. Everything's working perfectly now, pedal feel is back to normal, all warning lights are gone, and the ABS system is functioning as it should. The braking performance is solid, just like when the truck was new. The diagnostic tools confirmed all sensors are now reading correctly. It's definitely worth getting it done properly. Having replacement parts or major repairs wasn't necessary, it was just about getting the trapped air out using the right bleeding sequence. My experience shows these modern brake systems are pretty reliable once properly serviced. Haven't noticed any other issues with any vehicle safety systems since the fix, everything's been running smoothly for the past week. The original symptoms completely disappeared after the proper brake system bleeding.

Wanted to update everyone on how this turned out. Just got back from the dealer and turns out the diagnostic tools confirmed exactly what was discussed here, trapped air in the brake system from a bad maintenance job. The whole brake system flush and bleeding process took about two hours. They used professional pressure bleeding equipment to work through each brake caliper. Total bill came to €175, which wasn't as bad as I'd feared. The brake pedal feel is completely back to normal now, and all those annoying warning lights have disappeared. Interesting part was watching the mechanic use the diagnostic tools to verify the pressure sensor readings before and after. Really showed how the trapped air was messing with the vehicle safety systems. The brake booster is working perfectly now, no more hard pedal or warning lights. Should've gone straight to the dealer instead of that first mechanic who couldn't figure it out. Sometimes paying a bit more for proper diagnostic tools and expertise saves money in the long run, especially with these modern brake systems.