One problem related to brake electric antilock has been reported for the 2006 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 GMC Sierra 2500 based on all problems reported for the 2006 Sierra 2500.
2006 GMC Sierra 2500 hd brake pedal feels spongy and harder to stop while towing a boat. The hydroboost seems to emit a humming sound when the brake pedal is applied. The incident occurs when the transmission temperature reaches 180- 190 degrees according to the gauge.