Vehicle recall 78V098000 · May 3, 1978

1977-1978 GMC DF9500

These vehicles do not conform to federal motor vehicle safety standard no. 121, "air brake systems".

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

Summary: These vehicles do not conform to federal motor vehicle safety standard no. 121, "air brake systems". These vehicles were built with an incorrect resistor board in the eaton controller on the wheel lock control valve.
Remedy: Dealer will remove the incorrect resistor board and install the correct one, without charge to owner.
Notes: Vehicle description: trucks equipped with eaton anti-lock systems.system: service brakes; anti-lock systems.consequences of defect: this incorrect resistor board could cause the wheellock control system to become inoperative at speeds over 35 MPH. In the eventwheel lock-up does occur, loss of vehicle control and an accident could result.note: this condition would be signaled to the driver by illumination of theyellow wheel lock control light.

Recall details

NHTSA campaign: 78V098000
Reported to NHTSA: May 3, 1978
Filed by: GENERAL MOTORS CORP.
Owner notification: April 26, 1978
Vehicles potentially affected: 59
Initiated by: the manufacturer
Components: Service brakes, air › Antilock › Control unit/module

Recall 78V098000 on nhtsa.gov, with the manufacturer’s documents

Vehicles covered

As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.

GMC DF9500 (1977-1978): 1978, 1977

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