Brakes:air control valve
Defect Summary
The involved vehicles do not conform to federal motor vehicle safety standard no. 121, "air brake systems". The two "o" rings that are supplied along with the new shuttle valves are of a buna "v" quality. These rings are fully functional in normal climate conditions, however, in extremely cold environments, slight leaks may develop. This valve acts as a seal between the cylinder heads of the shuttle valve and the piston. In time this seal may expand or "pucker up", making it possible for the shuttle to become trapped in an emergency braking situation.
Corrective Action
The dealer will replace all defective "o" rings with ones having extreme cold resistance properties.
Similar Recalls
Other recalls from Motor Coach Industries, Inc or involving Service Brakes, Air.
FAQ: Recall 77V186000
Your rights, the repair process, and what each field on this page means.
What is recall 77V186000?
NHTSA recall 77V186000 was issued by Motor Coach Industries, Inc on October 25, 1977. It addresses: Brakes:air control valve. The recall affects approximately 1,182 vehicles, with the defect involving the Service Brakes, Air component.
How do I get this recall repaired?
Contact any authorized Motor Coach Industries, Inc dealer and reference NHTSA recall ID 77V186000 or the manufacturer campaign number NR (Not Reported). Under federal law, the repair is completely free regardless of vehicle age or owner history.
Is my vehicle included in this recall?
The only way to confirm is to look up your 17-character VIN at nhtsa.gov/recalls. NHTSA's tool will tell you if VIN-by-VIN this exact recall applies.
How long do I have to get a recall repair done?
There is no expiration on most federal safety recalls. Even if your vehicle is years old and you bought it used, the manufacturer is required to perform the repair at no cost.
Where does the data on this page come from?
All information on this page is sourced directly from the U.S. Department of Transportation public dataset for NHTSA recalls. Last refreshed: 2026-05-22. For the most current official notice, visit nhtsa.gov/recalls.