Vehicle recall 90V121000 · June 25, 1990

Ford L8000, L9000 and 15 more models

Secondary service reservoir air check valves may not seat properly due to a mechanical interference condition between a circular brass guide and the wall of a cylindrical ferrule…

Summary

Secondary service reservoir air check valves may not seat properly due to a mechanical interference condition between a circular brass guide and the wall of a cylindrical ferrule in which the brass guide is intended to move freely.

Consequence

In the event of pressure loss in the supply reservoir,a defective check valve would allow pressure equalization between primary andsecondary service reservoirs, presenting the potential for loss or absence offront braking ability, which could cause loss of control and an accident.

Remedy

Install revised design secondary service reservoir check valve components.

Notes

System: air pressure check valves.vehicle description: heavy duty trucks and chassis cabs.