The 1978 GMC Brigadier has two recalls of equal severity, the most critical being a steering shaft connection that can separate and cause complete loss of steering control.
The steering column's intermediate shaft may not be securely fastened to the upper shaft, and if that connection lets go while driving, the driver loses the ability to steer the vehicle. The second recall applies to trucks equipped with air brakes and either a 427 cubic inch gasoline engine or a six- or eight-cylinder Detroit Diesel Allison engine: the copper air lines running to the brake application valve may have been connected to the wrong ports during assembly, meaning a significant air leak in the rear brake system can cause total loss of service brakes with no warning to the driver beforehand.
At a glance
What can fail
The bolt and nut that clamp the upper and intermediate steering shafts together may not be tightened enough, allowing the shafts to separate and causing loss of steering control.
What the fix does
No remedy description available.
Summarized — see the official notice for exact wording, dates, and contacts.
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At a glance
What can fail
Copper air lines for the brake application valve may be improperly connected. A major air leak in the rear brake system could cause sudden, complete loss of service brakes.
What the fix does
No remedy description available.
Summarized — see the official notice for exact wording, dates, and contacts.
