BENDIX SD-03-3625 Manuel D’Utilisation

5. With 120psi applied to the supply and return ports

simultaneously, apply a soap solution around the plunger
and cam follower in the yoke assembly.  Leakage should
not exceed a 1” bubble in less than 5 seconds (100
SCCM).

If the TW-12

™

 valve does not function as described or if

excessive leakage is detected, it is recommended that it be
replaced with a genuine Bendix

®

 service replacement.

Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures.  A warranty
may be voided if intrusive maintenance is performed during
the warranty period.

No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for system components. At a minimum the TW-12

™

 valves

should be inspected every 6 months or 1500 operating hours,
whichever comes first.

1. Check the TW-12

™

 control valve for proper operation.

2. Inspect the exterior of the valve for signs of leakage and

any apparent physical damage.

3. Inspect the control cable and its connection point to the

lever cam for damage and wear.

If the TW-12

™

 control valve does not function as required or

if leakage excessive, wear, or damage is noted during
inspection, replace the valve with a genuine Bendix

®

 service

replacement unit.

When working on or around brake systems and components,

the following precautions should be observed at all times:

1.

Park the vehicle on a level surface, apply the parking

brakes, and always block the wheels.  When working

around or under the vehicle, stop the engine and remove

the key from the ignition.  Always keep hands away

from chambers as they may apply as system pressure

drops.  Always wear safety glasses.

2.

When working in the engine compartment, the engine
should be shut off and the ignition key should be
removed.  Where circumstances require that the engine
be in operation, EXTREME CAUTION should be used
to prevent personal injury resulting from contact with
moving, rotating, leaking, heated or electrically charged
components.

3.

Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended procedures.
Use only the proper tools and observe all precautions
pertaining to the use of those tools.

4.

Following the vehicle manufacturer’s recommended
procedures, deactivate the electrical system in a manner
that safely removes all electrical power from the vehicle.

5.

If the vehicle is equipped with an air over hydraulic brake
system or any auxiliary pressurized air system, make
certain to drain the air pressure from all reservoirs before
beginning ANY work on the vehicle.  If the vehicle is
equipped with an AD-IS

®

 air dryer system or a dryer

reservoir module, be sure to drain the purge reservoir.

6.

Never connect or disconnect a hose or line containing
pressure; it may whip. Never remove a component or
pipe plug unless you are certain all system pressure
has been depleted.

7.

Never exceed manufacturer’s recommended pressure.

8.

Never attempt to disassemble a component until you
have read and understand all recommended procedures.
Some components contain powerful springs and injury
can result if not properly disassembled. Use only proper
tools and observe all precautions pertaining to use of
those tools.

9.

Use only genuine Bendix

®

 replacement parts,

components and kits.

A. Use only components, devices and mounting and

attaching hardware specifically designed for use
in hydraulic brake systems.

B. All replacement hardware, tubing, hose, fittings, etc.

must be of equivalent size, type and strength as
the original equipment.

10. Components with stripped threads or damaged parts

should be replaced rather than repaired. Do not attempt
repairs requiring machining or welding unless specifically
stated and approved by the vehicle and component
manufacturer.

11. Prior to returning the vehicle to service, make certain all

components and systems are restored to their proper
operating condition.

1. Park the vehicle on a level surface and block the wheels

and/or hold the vehicle by means other than the service
brakes.

2. Remove pressure from the vehicle service and parking

brake system. In the case of a hydraulic brake system
consult the vehicle manual for proper procedures to be
followed.

3. Identify and mark or label all lines and their respective

connections on the valve to facilitate ease of installation.