Vehicle recall 99V059000 · March 23, 1999
1999 AM General Hummer
Vehicle description: sport utility vehicles.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- Vehicle description: sport utility vehicles. The nuts used to attach the master cylinder to the hydroboost bolts were of the metric type rather than the required english type.
- Consequence
- A loose master cylinder condition can occur, causing longer than normal brake pedal travel during brake pedal applications.
- Remedy
- Dealers will replace the master cylinder-to-hydroboost mounting bolts and nuts.
- Notes
- Owner notification began April 6, 1999.OWNERS who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact am general at 1-734-523-8000.ALSO contact the national highway traffic safety administration's auto safety hotline at 1-888-dash-2-dot (1-888-327-4236).
Recall details
- NHTSA campaign
- 99V059000
- Reported to NHTSA
- March 23, 1999
- Filed by
- AM GENERAL CORPORATION
- Manufacturer campaign
- R9901
- Owner notification
- April 6, 1999
- Vehicles potentially affected
- 186
- Initiated by
- the manufacturer
- Components
- Service brakes, hydraulic › Power assist
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- AM General Hummer (1999): 1999
Has your AM General been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A AM General dealer can also check your VIN. Recall repairs are free.