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1990 Gmc C20

Component

Fuel System, Gasoline:Delivery:Hoses, Lines/Piping, And Fittings

Consequence of Defect

on c and k models, feed and or return fuel lines can contact the automatic transmission shift linkage cordon shaft. in addition, on k models lines may also contact front propshaft. in either case the fuel lines could be damaged resulting in a fuel leak.

Corrective Action

a hole could be rubbed through these fuel lines, allowing fuel leakage near exhaust crossover pipe; this could result in an engine compartment fire that could spread to the passenger compartment.

Recall Notes

install newly designed fuel line routing bracket to prevent contact and, if necessary, replace fuel lines.

1990 Gmc C20

Component

Service Brakes, Hydraulic:Pedals And Linkages

Consequence of Defect

loose pivot bolt holding the brake pedal to its support bracket could disengage from the nut.

Corrective Action

this could cause loss of braking activity that couldresult in a truck crash without prior warning.

Recall Notes

retorque brake pedal pivot bolts to specifications to prevent loosening.

1982 Gmc C20

Component

Power Train:Axle Assembly:Axle Shaft

Consequence of Defect

the rear axle shafts received improper heat treatment during manufacture. the shaft may break and the tire and wheel assembly could disengage from the vehicle.

Corrective Action

Recall Notes

dealer will replace both rear axle shaft assemblies, if necessary, free of charge.

1981 Gmc C20

Component

Service Brakes, Hydraulic:Fluid

Consequence of Defect

the hydraulic brake fluid used in certain vehicles may fail to comply with the brake fluid boiling point requirements of federal motor vehicle safety standard no. 116, "motor vehicle brake fluids". braking efficiency may be reduced and vehicle stopping distance increased, especially when hard or frequent braking raises brake fluid temperature.

Corrective Action

Recall Notes

suspect hydraulic brake fluid will be bled from the brake system and replaced with gm delco supreme no. 11 or an equivalent, without charge.

1980 Gmc C20

Component

Service Brakes, Hydraulic:Power Assist:Vacuum

Consequence of Defect

fatigue cracks may develop in the brake vacuum booster housing. this may cause a vacuum leak and reduce the effectiveness of the brakes. after prolonged use, the cracks may develop to the extent that the booster may separate from the vehicle.

Corrective Action

Recall Notes

vehicles will be inspected for fatigue cracks in the brake vacuum booster. those without cracks will have a support brace installed. those with evidence of cracking will have a new brake vacuum booster and support brace installed. this service will be provided at no charge.

1979 Gmc C20

Component

Service Brakes, Hydraulic:Power Assist:Vacuum

Consequence of Defect

fatigue cracks may develop in the brake vacuum booster housing. this may cause a vacuum leak and reduce the effectiveness of the brakes. after prolonged use, the cracks may develop to the extent that the booster may separate from the vehicle.

Corrective Action

Recall Notes

vehicles will be inspected for fatigue cracks in the brake vacuum booster. those without cracks will have a support brace installed. those with evidence of cracking will have a new brake vacuum booster and support brace installed. this service will be provided at no charge.

1979 Gmc C20

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 C20

Component

Vehicle Speed Control:Accelerator Pedal

Consequence of Defect

the accelerator pedal rod in combination with the pedal installed on the involved vehicles may cut through the floor pan rubber mat or carpet into the thick resilient insulation pad underneath during heavy or repeated full throttle applications. as a result, the accelerator pedal rod may catch in the mat or carpet, preventing the throttle from returning to idle when the driver"s foot is removed from the pedal.

Corrective Action

Recall Notes

dealer will install a new accelerator pedal and retainer designed to prevent the accelerator pedal rod from cutting the rubber mat or carpet. this will be performed without charge.

1976 Gmc C20

Component

Vehicle Speed Control:Accelerator Pedal

Consequence of Defect

the accelerator pedal rod in combination with the pedal installed on the involved vehicles may cut through the floor pan rubber mat or carpet into the thick resilient insulation pad underneath during heavy or repeated full throttle applications. as a result, the accelerator pedal rod may catch in the mat or carpet, preventing the throttle from returning to idle when the driver"s foot is removed from the pedal.

Corrective Action

Recall Notes

dealer will install a new accelerator pedal and retainer designed to prevent the accelerator pedal rod from cutting the rubber mat or carpet. this will be performed without charge.

1975 Gmc C20

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.