1 recall across 1 model year
The GMC M9500 has 1 recall affecting the 1975 model year, where contaminants in the air brake system can cause pistons inside the anti-lock relay valves to swell, stick, and block air from reaching the brake chambers, resulting in reduced or lost braking power on the affected axle.
When the piston jams in the valve, the brakes on that axle may not respond fully or at all, significantly extending stopping distances and raising the risk of a collision.
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