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Vehicle recall 77V186000 · October 25, 1977

Motor Coach MC5B, MC5C and 1 more model

The involved 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
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.
Remedy
The dealer will replace all defective "o" rings with ones having extreme cold resistance properties.
Notes
Vehicle description: motor homes equipped with new shuttle valves.system: service brakes; air control valve.consequences of defect: in this event, the brakes once "on" will not releaseand loss of vehicle control and an accident could result.note: driver should be alerted to this condition by a flashing light, buzzer,and a low reading on the air gauge.

Recall details

NHTSA campaign
77V186000
Reported to NHTSA
October 25, 1977
Filed by
MOTOR COACH IND., INC.
Owner notification
October 5, 1977
Vehicles potentially affected
1,182
Initiated by
the manufacturer
Components
Service brakes, air › Supply
Recall 77V186000 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.

Has your Motor Coach 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 Motor Coach dealer can also check your VIN. Recall repairs are free.