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Technical Bulletin

Bulletin No.: PRO-03-11 Effective Date: 7/5/77 Page: 1 of 1

Subject: LQ-4 Front Axle Ratio Valve

We are pleased to announce the availability of our new LQ-4 Front Axle Ratio Valve,

which replaces and obsoletes the LQ-3.

Notice 7 of FMVSS, which became effective 2/26/76, extended stopping distances and

permitted vehicle manufacturers to depower front axle brakes and eliminate antilock on

the front axles of many vehicles.

The LQ-4 has been engineered with sufficient capacity to handle chamber sizes up to

type 24, and does not require an additional relay valve to meet 121 brake timing

requirements.

The LQ-4 is directly interchangeable with, and directly replaces its predecessor, the

LQ-3. The LQ-4’s mounting flange and size are identical to that of the LQ-3, however

porting has been increased from ¼” to 3/8”.

Please use the conversion list below as a reference until catalog page 03-A-3 has been

revised. Piece number identification appears on the edge of the cover of both the LQ-3

and LQ-4.

Conversion List

(Obsolete) (New)

LQ-3 LQ-4

286289 289144

286682 289145

287187 289146

287253 289147

287276 289148

287279 289149

288532 289150

Note: Because of recent D.O.T. rulings, the LQ-3A is no longer used by OEM.

Therefore, a high capacity valve (LQ-4A) will not be manufactured at this time.

Technical Bulletin 1

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Technical BulletinBulletin No.: PRO-03-11 Effective Date: 7/5/77 Page: 1 of 1Subject: LQ-4 Front Axle Ratio ValveWe are pleased to announce the availa

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