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More info: visit www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Bobtail R atio Valves
The LQ-5
™
bobtail ratio valve is used on the front
(steering) axle of tractor air brake systems to reduce
brake application pressure during normal tractor-trailer
operation. During bobtail mode (when the tractor
is not pulling a trailer), tractor braking performance
is improved because the LQ-5
™
bobtail ratio valve
delivers full brake pressure to the steering axle.
The LQ-5
™
bobtail ratio valve is designed for tractor
systems only, and it replaces the existing front axle
limiting valve.
Brake Proportioning Relay Valves
The BP-R1
®
bobtail proportioning relay valve is a
combination of two valves in a single housing. The
lower portion contains a “standard” service brake relay
valve, which functions as a relay station to speed up
brake application and release. The upper portion
houses a brake proportioning valve which reduces
normal service brake application pressure when the
tractor is not towing a trailer (bobtail operation). The
control port on the BP-R1
®
valve is connected to
the trailer supply valve delivery and signals bobtail
operation.
Ratio, Proportioning Valves
BP-R1
®
Bobtail
Proportioning
Relay Valve
LQ-5
™
Bobtail Ratio
Valve
PP-7
™
Valve
LQ-5
™
Valve
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