SERVICE BRAKES SOON

[ALVTAHOE]

I have a 2008 LT Tahoe with 139K miles and everytime I start the truck a "SERVICES BRAKES SOON" message comes up on the DIC. New brakes,rotors and hubs have been replaced since the light came on and also the brake switch was replaced. As anyone else experienced this and if so what did you do to fix it. Thanks.

 

[FuzzyChopz]

Make sure your brake fluid is at normal level. Maybe the vehicle needs a code reset after the new work was done. Try checking for codes then reset it. If you don't have a scanner, remove the battery terminals for about 30 mins. Or take it to autozone and use their scanner

 

[Chris Goione]

I know this is an old thread, but I wanted to put this here, in case someone has the same problem, and Google leads them here. I had the "Service Brakes Soon" annoyance on a 2012 Chevy Avalanche. It would only come on intermittently, usually on the highway. First try was a new Brake Booster Sensor, which did not do the trick. I tracked it down to being a leaking O-ring between the Master Cylinder and Brake Booster. You can fix this in about 15 minutes. Remove the Master cylinder from Brake Booster by taking off two 15mm Nuts. Remove old O-Ring, and replace with new O-Ring. I used a slightly thicker O-Ring just trying to get a better seal. That cured the "Service Brakes Soon" for good. Brakes felt better under foot also. Hope this helps someone, it's a tough one to track down.

 

[ALVTAHOE]

Chris, Can you tell me where you got this o-ring from and the size if possible? Thanks.