Air Brake Abs Warning Light problems of the 2002 GMC Yukon

I have a 2002 Yukon denali awd. I took a long trip this week for vacation and noticed that the abs light as been coming on and off, and now its on all the time. Whenever im moving at low speeds it tends to pulse when I brake or have the abs activate making an easy slow stop become and long stop that has made me swerve to miss many near collisions in the past few days. Im also hearing a knocking sound at low speeds in the drive side wheel only when I turn right, between the 2 that have just recently appeared made my 900 mile trip a nightmare, not knowing what it is. I've researched the problem online and notice there was a recall in canada for the same problem and that the complaints are not high enough to get it in the u. S. So how many ppl need to risk being injured or killed for gm to do the right thing. They obviously no something is wrong and is not willing to help the consumers. Thanks.