Report: Service Brake System message, low brake fluid
GMC Acadia Problem
Model Year Affected: 2007
Service brake system message, sometimes Service Stability, red brake light and TRAC OFF message.
These are sometimes the result of low brake fluid, but no obvious leaks are noted. Due to the design of the master cylinder and brake booster, the master cylinder can leak from the rear seal and collect inside the booster, leaving no drops on the ground or obvious signs.
You will need to replace the master cylinder and booster to correct.