Three problems related to brake antilock wheel speed sensor have been reported for the 2004 GMC Sierra. The most recently reported issues are listed below.
When attempting to stop on dry pavement, the abs activates at a very low speed, approx 5mph, the truck will not stop as expected. Almost caused my wife and kids to hit vehicle in front. Mechanics have stated this is a common problem with gm trucks and the hub with speed sensor will need replaced or repaired at owner expense.
I experience brake pedal pulsation (low speed abs activation) when rolling to a stop. My GMC onstar report says there is nothing wrong with my abs braking system yet I have this problem. The problem seems to be rusted and/or froze up wheel speed sensors as verified by two different mechanics. I understand they were recalls by GMC of other trucks experiencing this same problem. I really hate to pay $750 for new front wheel bearing assemblies. I want my truck recalled for this problem. There is a GMC technical bulletin 03-05-25-007d. I am not sure the abs will function properly when really needed??.
Abs brake system activates at stops. Had to pump brakes to stop vehicle. Dealer had to replace corroded front wheel speed sensors. Sensors should last longer than four years, should last the life of the vehicle. Cost $378 to repair.