97 sub brakes

I have a 97 K1500 5.7 and sometimes at low speed the left front brake studders.
Sometimes on ice, sometimes on wet stops . I live in Michigan so I get all
kinds of weather . Could it be the bolt/pins ? 110k on the truck .

Most likely the wheel speed sensor for the abs is dropping out at low speeds. Like almost stopped. The guys down south say they have luck cleaning them,I live in Ontario and I have yet been victorious. Best bet is to live with it or replace the wheel bearing assm.