Vehicle recall 88V171000 · November 1, 1988

1984-1987 Emergency One Ambulance

Use of the air horn can cause the air pressure to drop below 85 PSI.

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

Summary: Use of the air horn can cause the air pressure to drop below 85 PSI.
Consequence: If air pressure drops below 85 PSI while the vehicle isbeing driven the rear brake spring chambers will start to apply causing therear brake drums to overheat.
Remedy: Install pressure protection valves in all air horn circuits.
Notes: System: air pressure/brakes.vehicle information: ambulance units with rockwell U170 and S170 axles.

Recall details

NHTSA campaign: 88V171000
Reported to NHTSA: November 1, 1988
Filed by: E-ONE, INC.
Owner notification: December 7, 1988
Vehicles potentially affected: 71
Initiated by: NHTSA’s Office of Defects Investigation
Components: Service brakes, air › Supply › Low pressure warning › Switch

Recall 88V171000 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.

Emergency One Ambulance (1984-1987): 1987, 1986, 1985, 1984

Has your Emergency One 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.

Check your VIN with NHTSA

NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Emergency One dealer can also check your VIN. Recall repairs are free.