The 1998 GMC B7 has two recalls, both involving the anti-lock brake system, where faults can cause the brakes to underperform and extend stopping distances, raising the risk of a crash.
In the first issue, damaged or chafed wheel speed sensor wires can trigger unwanted ABS activation at low speeds, causing the system to bleed air pressure from the brake modulators at one or more wheels and reducing braking force. In the second, the wiring harness that controls the front brakes can chafe and short to ground, shutting off the ABS entirely and reducing front braking capability. Both issues point to the same real-world result: the truck may need more distance to stop than expected.
At a glance
What can fail
The ABS system may activate unexpectedly at low speeds. This happens when wheel speed sensor wires chafe against rotating parts, or when a wheel-end component is damaged and sends irregular signals to the ABS control unit.
What the fix does
The ABS electronic control unit will be replaced.
Summarized — see the official notice for exact wording, dates, and contacts.
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At a glance
What can fail
The electric brake control harness can rub and wear, causing an electrical short. This triggers a warning light and disables the anti-lock brake system.
What the fix does
Dealers will inspect the harness for wear and routing issues, then repair as needed.
Summarized — see the official notice for exact wording, dates, and contacts.
