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SD-13-4772

Bendix

M-12

™

& M-12R

™

AntiLock Modulator

designed for direct controller mounting while the M-12R

™

modulator uses a cover plate where the controller would

normally mount and a wire harness is attached to the

M-12R

™

modulator in order to connect it to the antilock

controller. Two body styles are available; one with four

vertical delivery ports and another with two vertical and two

horizontal delivery ports.

The M-12

™

/M-12R

™

modulator is normally mounted close

to the service actuators it serves, and it can be nipple

mounted to a reservoir or secured to the frame rail.

The M-12

™

modulator air connections are as follows:

M-12

™

/M-12R

™

Modulator Embossed

Air Connection Identification

Supply (to reservoir) SUP

Delivery (to brake actuator) DEL

(can have 2 horizontal & 2

vertical deliveries or

4 vertical deliveries)

Control CON

(to rear service brake valve delivery)

The standard M-12

™

and M-12R

™

modulator is offered with

a 4 psi crack pressure. The internal components are

interchangeable with R-12

™

and R-14

™

relay valves therefore,

the same maintenance kit is used to service all.

DESCRIPTION

The M-12

™

antilock modulator is a standard component in

Bendix antilock systems. It is comprised of two components:

solenoids, which rapidly apply and exhaust air during an

antilock stop, and a standard relay valve.

During normal, non-antilock operation, the M-12

™

modulator

serves as a relay valve that speeds the application and release

of the service brakes. If wheel lock up is impending, a antilock

controller commands the solenoids to modulate brake

chamber pressure on the axle(s) on which the system is

installed.

The M-12

™

modulator is offered in two configurations as

illustrated in figure 1. The M-12

™

modulator permits direct

attachment of an antilock controller, and it accepts electronic

commands from the controller through a four pin connector

(see Figure 1). The M-12R

™

modulator is designed for remote

mounting on a vehicle frame rail or cross member. It accepts

electronic commands from a remote mounted controller

through a wire harness assembly that has a four pin

connector at one end and a three pin connector at the other

(see Figure 1). The M-12

™

modulator and M-12R

™

modulator

differ from each other only in that the M-12

™

modulator is

FIGURE 1 M-12

™

AND M-12R

™

MODULATORS

M-12

™

Modulator

M-12R

™

Modulator

CONTROL

PORT

3 PIN

CONNECTOR

CONTROL

PORT

WIRE

HARNESS

4 PIN

CONNECTOR

SUPPLY

PORT DELIVERY

PORTS

2 VERTICAL

2 HORIZONTAL

SUPPLY

PORT

DELIVERY

PORTS

4 VERTICAL

COVER

PLATE

1 2 3 4 5 6 ... 11 12

Sommario

Pagina 1 - AntiLock Modulator

1®SD-13-4772Bendix® M-12™ & M-12R™ AntiLock Modulatordesigned for direct controller mounting while the M-12R™modulator uses a cover plate where th

Pagina 2

Pagina 3 - OPERATION

Pagina 4 - OPERATIONAL AND LEAKAGE TEST

Pagina 5 - PERSONAL INJURY OR DEATH:

2FIGURE 2A FULL VEHICLE AXLE CONTROL - TRUCK/TRACTORFIGURE 2B TANDEM SPREAD AXLE TRAILER - AXLE CONTROL SYSTEMRELAYSERIAL LINKIN-AXLE WHEELSPEED SEN

Pagina 6 - MODULATOR INSTALLATION

3FIGURE 3 APPLYING: NORMAL SERVICE APPLICATIONEXHAUSTING: NORMAL SERVICEAPPLICATIONWhen a service application is released, air at the modulatorcontro

Pagina 7 - MODULATOR

4FIGURE 4 BALANCED POSITIONPREVENTIVE MAINTENANCEImportant: Review the warranty policy before performingany intrusive maintenance procedures. An exte

Pagina 8

5FIGURE 6 ANTILOCK MODE: SOLENOIDS ACTIVATED2. With the service brakes released, coat the exhaust portand the area around the retaining ring with a s

Pagina 9 - ASSEMBLY - REFER TO FIGURE 8

68. Use only genuine Bendix® replacement parts,components and kits. Replacement hardware,tubing, hose, fittings, etc. must be of equivalentsize, type

Pagina 10

7TYPICAL M-12R™ MODULATORTYPICAL M-12™ MODULATORFOUR PINCONNECTORTHREE PINCONNECTORSHORT WIREHARNESSBETWEEN THREEAND FOUR PINCONNECTOR(M-12R™MODULATOR

Pagina 11

8CAP SCREW (4)CAP SCREW (4)ANTILOCKCONTROLLERUSED ON M-12™MODULATORCOVER PLATEUSED ON THEM-12R™MODULATOR11245678910111214133FIGURE 8 M-12™/M-12R™ MOD

Pagina 12

96. Using thumb force on the piston stem, push the piston(6)out the opposite end of the body(7). Remove o-ring(5)from the piston.7. Discard all items

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