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Technical Bulletin

Bulletin No.: PRO-03-17 Effective Date: 2/15/79 Page: 1 of 1

Subject: VM-2 Piece No. 289253

The standard VM-2 valve is a tractor protection valve with two double check valves. The

valve receives service line signals from both circuits of a dual brake valve (E-6, E-7) and

from the trailer hand control valve (TC-2).

VM-2 Piece No. 289253 omits the double check valve shuttle and guide which normally

receives the TC-2 signal. (The omitted portions are shown dotted in cross-section Figure

1.) The port in the cap nut is plugged. If 289253 is replaced in service with a standard

VM-2, such as 288605, and a pipe plug is placed in the TC-2 port, the service line may

trap air causing the trailer brakes to drag and keep the stop lamp switch on.

For 289253 replacement, it is recommended that 289253 be used. However, if

necessary, a standard VM-2 may be used if the double check shuttle and shuttle guide

are removed and the trailer supply plugged.

289253 is used exclusively by White and is identified by White No. C.P.N. 7901-0006.

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Technical BulletinBulletin No.: PRO-03-17 Effective Date: 2/15/79 Page: 1 of 1Subject: VM-2 Piece No. 289253The standard VM-2 valve is a tractor prote

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