BENDIX R-12V User manual
1
BENDIX®R-12®& R-14®UNIVERSAL SERVICE REPLACEMENT RELAY VALVES KIT
Figure 1 – Bendix®R-12®& R-14®Universal Service Replacement Relay Valves Kit
R-12®Relay Valves
R-14®Relay Valves
R-12V R-12H
R-14V R-14H
Kit Contents
Item No. Description Qty.
1 O-Ring 1
2 *Shim Washer 3
3 *Shim Washer 3
4 *Shim Washer 3
5 Spring 1
6 Piston Bearing 1
7 O-Ring 1
8 O-Ring 1
9 O-Ring 1
10 Washer 3
* Nine shims of three different thicknesses are
included in this kit.
2
GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS
TO AVOID PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES:
▲Park the vehicle on a level surface, apply the
parking brakes and always block the wheels.
Always wear personal protection equipment.
▲Stop the engine and remove the ignition key
when working under or around the vehicle.
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.
▲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 use of those
tools.
▲If the work is being performed on the vehicle’s
air brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning ANY work
on the vehicle. If the vehicle is equipped with a
Bendix®AD-IS®air dryer system, a Bendix®DRM™
dryer reservoir module, or a Bendix® AD-9si®air
dryer, be sure to drain the purge reservoir.
▲Following the vehicle manufacturer’s
recommended procedures, deactivate the
electrical system in a manner that safely removes
all electrical power from the vehicle.
▲Never exceed manufacturer’s recommended
pressures.
▲Never connect or disconnect a hose or line
containing pressure; it may whip and/or cause
hazardous airborne dust and dirt particles. Wear
eye protection. Slowly open connections with
care, and verify that no pressure is present. Never
remove a component or plug unless you are
certain all system pressure has been depleted.
▲Use only genuine Bendix®brand replacement
parts, components and kits. Replacement
hardware, tubing, hose, fi ttings, wiring, etc. must
be of equivalent size, type and strength as original
equipment and be designed specifi cally for such
applications and systems.
▲Components with stripped threads or damaged
parts should be replaced rather than repaired.
Do not attempt repairs requiring machining or
welding unless specifi cally stated and approved
by the vehicle and component manufacturer.
▲Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
▲For vehicles with Automatic Traction Control
(ATC), the ATC function must be disabled (ATC
indicator lamp should be ON) prior to performing
any vehicle maintenance where one or more
wheels on a drive axle are lifted off the ground
and moving.
▲The power MUST be temporarily disconnected
from the radar sensor whenever any tests USING
A DYNAMOMETER are conducted on a vehicle
equipped with a Bendix® Wingman®system.
▲You should consult the vehicle manufacturer's operating and service manuals, and any related literature,
in conjunction with the Guidelines above.
3
Midland®KN28010, 28010A
CHANGEOVER INFORMATION
BENDIX®R-12®& R-14®UNIVERSAL REPLACEMENT RELAY VALVES
The R-12®(H & V) and the R-14®(H & V) universal replacement valves include mounting bracket Pc. No. 296010 and
installation instructions. The R-12 and R-14 relay valves are available with either two (2) horizontal delivery ports or four (4)
vertical delivery ports. The R-12 and R-14 can be used in either service or spring brake control systems and in addition
can be used to replace anti-lock modulators when the anti-lock system is reverted to a straight service brake system. The
R-12 and R-14 relay valves are similar in appearance. The difference between them is the R-14 incorporates a balance
port which provides the added feature of built in anti-compounding when the R-14 is used to control the emergency
section of the spring brakes. Refer to the chart below to select the appropriate R-12 or R-14 relay valve.
Fig. 4
Fig. 5 Fig. 6 Fig. 7 Fig. 8
Fig. 9 Fig. 10
Fig. 1 Fig. 3Fig. 2
Fig. 11 Fig. 12
Fig. 13 Fig. 14 Fig. 15 Fig. 16
Bendix R-1®Bendix R-5®Bendix R-6®Bendix R-8®
Bendix R-10®Berg®12342, 12343, 12344 Berg 12345, 12346 Kelsey Hayes®
Midland KN28060, 28060A Midland KN28130 Midland 28140
Midland 28160 Sealco®A1100 Sealco 9125 Series Wagner®RG-2
4
Make Model Control
(service)
Supply
(reservoir) Delivery Ref.
Fig. Comments
Bendix®R-1C (1) 1/4" (2) 1/2" or (2)
1/2" & (1) 3/4" (3) 3/8" 1 Ref. Bendix Cat. Pg.
03-B-1
Bendix R-5 (2) 1/4" (2) 1/2" or (2)
1/2" & (1) 3/4"
(2) 1/2" & (2)
3/8" 2Ref. Bendix Cat. Pg.
03-B-2
Bendix R-6 (1) 1/4" (1) 3/8" or 1/2"
and/or (1) 3/4" (4) 3/8" 3 Ref. Bendix Cat. Pg.
03-B-3
Bendix R-8 (1) 1/4" (1) 3/4" or (2)
3/4"
(2) 1/2" & (1)
1/4" 4Ref. Bendix Cat. Pg.
03-B-4
Bendix R-12 (1) 1/4" (1) 1/2" (4) 1/2" * Pc. No. 102277
Bendix R-10 (2) 1/4" 1/2" or 3/4" 3/8" or 1/2" 5 Ref. Bendix Cat. Pg.
03-B-4B
Berg®12340 (1) 1/4" (1) 1/2" (2) 3/8" * With Bracket
Berg 12341 (1) 1/4" (1) 1/2" (2) 3/8" * No Bracket
Berg 12342 (1) 3/8" (1) 3/8" (4) 3/8" 6 Triangular Bracket
Berg 12343 (1) 3/8" (1) 3/8" (4) 3/8" 6 No Bracket
Berg 12344 (1) 3/8" (1) 3/4" (4) 3/8" 6 Side Mount Bracket
Berg 12345 (1) 1/4" (1) 3/4" (4) 3/8" 7 Four Delivery Ports
Berg 12346 (1) 1/4" (1) 3/4" (2) 3/8" 7 Two Delivery Ports
Kelsey
Hayes®5468 (1) 1/4" (1) 1/2" (2) 3/8" 8 Truck / Tractor Relay
Valve with Bracket
Kelsey
Hayes 5470 (2) 3/8" (1) 1/2" (1) 3/4" (4) 3/8" and
1/2" 8Trailer Relay Valve (no
Bracket)
Midland®KN-28000 (1) 1/4" (2) 3/8" (2) 3/8" * Diaphragm Type,
Mounting Bracket
Midland KN-28010 (1) 1/4" (1) 3/8" (2) 1/4" (1)
3/8" 9 Triangular Bracket
Midland KN-28010A (1) 1/4" (1) 3/8" (3) 3/8" 9 Triangular Bracket
Midland KN-28060 (1) 3/8" (2) 1/2" (2) 1/2" 10 Mounting Bracket on
Cover
Midland KN-28060A (1) 3/8" (2) 1/2" (2) 1/2" 10 Mounting Bracket on
Cover
Midland KN-28130 (2) 1/4" (1) 1/2" (2) 1/2" 11 Frame Rail Mounting
Midland KN-28240 (1) 1/4" (2) 1/2" (2) 1/2" 12 Frame Rail Mounting
Midland KN-28160 (1) 1/4" (1) 3/4" (2) 1/2" 13 Pad or Nipple Mount
Sealco®A-1100 (2) 1/4" (1) 3/8" (4) 1/4" 14 Truck / Tractor Relay
Valve
Sealco 9125 Series (2) 1/4" (2) 1/2" (2) 3/8" (1)
1/2" 15 All 9125 Series Valves
Wagner®Model RG-2 (1) 1/4" (2) 3/8" or 1/2" (2) 3/8" or
1/2" 16
Includes Parts AE-
78880, 78887, 78889
*Not Illustrated
RELAY VALVE SPECIFICATION CHART
5
To facilitate installation the following ttings may be used:
Reducer Bushings
Thread Size Piece Number
3/4" to 1/2" 234680
1/2" to 3/8" 230808
1/2" to 1/4" 230130
1/2" NPT Pipe Nipple (Heavy Duty)
Length Piece Number
1-1/2" 212324
PREPARATION
1. Block all vehicle wheels.
2. Drain air pressure from all reservoirs.
3. Locate valve to be replaced: note method of mounting.
4. If valve is bracket mounted:
A. Note position of bracket relative to supply port
(reservoir connection).
B.Determine mounting position of bracket on R-12®
or R-14®valve.
C. Remove two cap screws from valve cover, mount
bracket and retorque cap screws to 80-120 in-lbs.
(DO NOT REMOVE ALL FOUR CAP SCREWS
FROM COVER AT THE SAME TIME.)
5. If valve is reservoir mounted:
A. Discard bracket.
B. Check the reservoir port size. If an R-12V or R-14V
valve is to be installed and the reservoir port is larger
than 1/2" P.T., a reducer bushing will be required.
C. Mount the R-12V or R-14V using a 1/2" heavy wall
steel nipple. Use a "Teon" pipe thread sealant on
both ends of the nipple to prevent thread damage
when removal is necessary.
6. Identify and mark all lines to valve as follows:
A. Service port (from brake valve or control valve).
B. Supply port (from reservoir).
C. Delivery ports (from chambers).
7. Remove air lines, then valve.
INSTALLATION
8. Install the R-12 or R-14 valve. If bracket mounted,
secure to frame. If reservoir mounted, use small
amount of pipe sealant on reducer bushing and/or
nipple as necessary.
9. Select and install air lines, using necessary ttings
and a small amount of pipe sealant. Plug all unused
ports and remove and discard the cardboard protector
from the exhaust port of the R-12 or R-14, if it is so
equipped.
10. Before placing the vehicle in service, close all reservoir
ports and perform the following tests:
A. Full charge the vehicle air system and adjust the
vehicle brakes.
B. Make several brake applications and check for
prompt application and release of the brakes at
the appropriate wheels.
C. Make and hold a brake application and check all
R-12 or R-14 ttings for excessive leakage with
a soap solution. Tighten ttings as required.
6
S-0758 Rev. 002 © 2019 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group • 12/19 • All Rights Reserved
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3
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