BENDIX TCH-003-011 Fascicule
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.
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.
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.
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”.
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.
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.
Therefore, a high capacity valve (LQ-4A) will not be manufactured at this time.