9999 MIDLAND GRAU AIR BRAKE RELAY VALVE Recall

Campaign:

92E008000 on 04/08/1992

Component:

Service brakes, air

Manufactured:

12/31/1990 - 11/30/1991

Affected:

23,000

Defect:

There is an interference fit between the valve cover bore and the valve piston. this interference fit situation has been aggravated by liquid contamination within the air system which has caused the piston to swell and stick (seize) in the cylinder bore.

Consequence:

Piston seizure causes the brakes to drag which couldproduce sufficient heat to result in tire fires.

Correction:

Remove and replace the defective relay valve.

Notes:

System: air brakes.equipment description: rg-5 relay valve; part numbers: n-30110, n-30110-a,n-30110-ba, kn-28550 and kn-28551 having date codes between 011k and 491k.note: if at any time there is a question whether or not the valve is functioningproperly, replace it or deadline vehicle and contact midland technical servicefor assistance (1-800-643-2374).

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