Mci · Canada · Mod
Mci MC-8, MC-5B +1 more: Not Entered
Affects Mci MC-8, MC-5B, MC-5C · 1977 — about 653 vehicles.
The hazard
VEHICLES WERE EQUIPPED WITH A NEW SHUTTLE VALVE (M.C.I. NO. 4R-22-21) THAT CONTAINS TWO "O" RINGS MADE OF BUNA "N" QUALITY RUBBER THAT MAY DEVELOP LEAKS IN EXTREMELY COLD WEATHER. THE SHUTTLE VALVE ALSO CONTAINS TWO FLAT NEOPRENE WASHERS THAT TEND TO "PUCKER UP" WITH TIME AND COULD TRAP THE SHUTTLE VALVE WHEN THE EMERGENCY BRAKES ARE APPLIED. SHOULD THIS CONDITION OCCUR THE EMERGENCY BRAKES WOULD NOT RELEASE AND THEREFORE COULD NOT BE MODULATED AS REQUIRED BY C.M.V.S.S. 121 - AIR BRAKE SYSTEMS.
What to do
Contact your dealer; the remedy details were not included in the filing.
Critical — crash/injury risk now
High — injury risk; see remedy
Moderate — fix at next service
Low — minor / informational