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1979 Gmc C30

Component

Service Brakes, Hydraulic:Foundation Components:Hoses, Lines/Piping, And Fittings

Consequence of Defect

the front hoses on the involved vehicles may have improperly oriented hose fittings, resulting in a rubbing contact between the right brake hose and the upper control arm of the front suspension or in a twisted left hose resulting in a faulty attachment at the frame fitting. should either of these conditions exist, they could eventually result in brake hose failure causing loss of brake fluid and consequent loss of the front braking action.

Corrective Action

Recall Notes

the dealer will inspect and, if necessary, replace one or both front brake hoses at no cost to owner.

1979 Gmc C30

Component

Exterior Lighting:Brake Lights:Switch

Consequence of Defect

on the involved vehicles the brake stoplight and cruise control switch which is operated by the brake pedal may have been assembled with an incorrect lubricant on the actuating plunger. this can cause the rear brake stoplights to become inoperative and the cruise control, if activated, to stay electrically engaged.

Corrective Action

Recall Notes

dealer will inspect and, if necessary, replace the brake stoplight and cruise control switch at no cost to owner.

1977 Gmc C30

Component

Service Brakes, Hydraulic:Power Assist:Vacuum

Consequence of Defect

on the involved vehicles, the nuts which attach the brake master cylinder to the hydro-boost unit may have been over-tightened. this could have caused stripped threads and cracked attaching flanges. should these nuts fail, the parts may separate and loss of service brakes would result.

Corrective Action

Recall Notes

dealer will inspect for cracks in the attaching flanges; units with cracks present will be replaced. if no cracks are found, the studs will be removed and the holes drilled out. the unit will be reassembled using bolts and nuts in place of the existing studs.

1976 Gmc C30

Component

Service Brakes, Hydraulic:Foundation Components:Differential Proportional Valve

Consequence of Defect

Corrective Action

Recall Notes

1975 Gmc C30

Component

Wheels:Multi Piece

Consequence of Defect

Corrective Action

Recall Notes

1975 Gmc C30

Component

Suspension:Front:Control Arm:Lower Arm

Consequence of Defect

the front suspension control arms were assembled with ball joints which may contain sockets that were not properly heat-treated. this may cause the socket to wear rapidly and allow the ball joint stud to separate from the socket, causing either the left or right wheel suspension to collapse.

Corrective Action

Recall Notes

dealer will inspect and, where necessary, will replace the ball joints without charge to owner.