NHTSA ID Number: 10189433
Manufacturer Communication Number: MGM Catalogue
TSB/Document Date: 2021-03-29
Summary
MGM Brakes catalogue
Bar
The bar is widely used in descriptions of pressure because it is only about 1%
smaller than “standard” atmospheric pressure, and is legally recognized in
countries of the European Union.
1 Atmosphere =1.01325 BAR
1 BAR = 100,000 Pascales
1 BAR =14.5037744 PSI
Bogie
Assembly of two or more drive axles, usually a pair in tandem.
Boot
Flexible rubber cover. Installs over service push rod to keep solid and
liquid contaminates out of service chamber.
Brake Drag
Brake fails to completely release, causing lining or pads to maintain
contact with the brake drum or rotor. May result in excessive lining and
drum wear, or possibly a wheel fire if the component parts become
excessively hot.
Brake Fade
Usually the result of heat-induced expansion of the brake drum caused
by the friction of the lining rubbing against the drum.
Brake Pot
Brake Chamber. Usually refers to “complete” or “combination” unit,
meaning service and spring parking brake chambers combined.
Bulk Pack
See “X-Pack”
Bushing
A cylindrical lining designed to reduce friction and wear inside a hole.
Cage
Refers to “releasing” the spring brakes.
Caging Bolt
Release tool. Used to “cage” the spring brake. Also referred to as a
“Release Bolt”.
Note: Product information and specifications subject to change without notice.
171
GLOSSARY OF TERMS
SECTION 16
TERMS
GLOSSARY OF TERMS
Can
Refers to service chamber or combination brake.
Cap
See “End Cap”
CCM
Chassis Communication Module. Receives and displays brake stroke
condition codes from sensors on brake chambers.
Center Section
See “Flange Case”.
Clevis
Connects service chamber push rod to slack adjuster. Also referred to as a
“Yoke”.
Combination
Service and spring parking brake chambers combined.
Combo
See “Combination”.
Common Carrier
Trucking company that hauls for hire.
Complete
See “Combination”.
Converter-Dolly
Auxiliary axle assembly equipped with fifth wheel for towing pup or
semi-trailer.
Crack Pressure
Minimum air pressure, expressed in pounds per square inch (psi), required
to open an air valve.
CVSA
Abbreviation for Commercial Vehicle Safety Alliance.
DD-3
Bendix brake actuator that uses a mechanical roller locking mechanism for
parking. Used primarily on transit coaches and intercity buses.
Dead Axle
Un-powered axle that can be lifted off the ground to save wear and tear on
the tires when the truck or trailer is empty. Usually mounted forward of
“drive” axles.
Diaphragm
Flexible rubber, or neoprene rubber, disc that separates pressurized areas of
the chamber from non-pressurized areas.
Disc Brake
Brake design in which a disc (rotor) is sandwiched between the brake pads.
Dolly
See “Converter-Dolly”.
Drive Axles
Axles that drive the truck or tractor. Usually refers to rear axle or axles.
Dust Boot
Flexible rubber cover installed over service push rod to keep solid and liquid
contaminates out of service chamber.
e•DT
e-STROKE Diagnostic Tool. Hand held or dash mounted “reader” that
allows operator to view data stored in the Chassis Communications Module.
e•LINK
Link between trailer CCM and tractor cab. Provides operator with instant
notification of any “fault” registered by the trailer Chassis Communications Module.
e•S3
Third generation e-STROKE System
Note: Product information and specifications subject to change without notice.
172
e-STROKE
Electronic brake stroke monitoring system.
E Model
MGM obsolete model spring brake. Replaced by the TR Model.
Emergency Brake
Independently actuated secondary brake system used for parking or
braking when the service brake is inoperative.
End Cap
Plastic piece used to close “release bolt” hole in top of spring brake. Also
referred to as a “plug”.
Fault Code
Blinking light on CCM that indicates problem with brake stroke status.
Flange Case
Usually made of aluminum and contains pocket for release tool and air
inlet ports. Also referred to as “Center Section”.
FMVSS
Abbreviation for Federal Motor Vehicle Safety Standard.
Front Axle
Axle at the front of the vehicle. Also known as the “steer” axle.
Glad Hand
Air brake line connector between truck and trailer.
HD
Heavy Duty
Head
Top of chamber . Also referred to as the spring cap.
Interlock
A mechanical device that prevents a component from functioning or situated in a
particular way. For Example, on transit coaches, the interlock applies the brakes
and holds the throttle at idle when a door is open. The interlock releases when
the door is closed.
Jake Brake
Device that manipulates the engine’s fuel system, intake and exhaust
valves to eliminate the power stroke and create drag.
Jam Nut
Nut on service push rod. Used to “lock” yoke onto rod.
L Model
Original MGM “double diaphragm” spring brake. Replaced by LTR-T
Model.
Un-powered axle that can be lifted off the ground to save wear and tear
on the tires when the truck or trailer is empty.
Long Stroke Brake
Any actuator, of equal size, with maximum stroke exceeding that of the
standard model.
LTR-L3 Model
Integral Release Bolt, Tamper Resistant, 3-Inch (76.2 mm) Stroke.
LTR-T Model
Integral Release Bolt, Tamper Resistant, with External Breather Tube.
Magnum
Brand name for MGM Models MB-T and MG-T piston/diaphragm brakes.
Maxi-Brake
Brand name also used as a generic reference for spring parking brake.
Mounting Base
See “Non-Pressure Chamber”.
Multiplexing
Means of sending discreet electrical signals to multiple devices through a
common set of wires.
Note: Product information and specifications subject to change without notice.
173
GLOSSARY OF TERMS
TERMS
TERMS
Newton
The newton is the unit of force derived in the SI system; it is equal to the
amount of force required to accelerate a mass of one kilogram at a rate of one
metre per second per second.
1Newton = 1 kg·m/s²
1000Newton=1 Kilo-Newton
NHTSA
Abbreviation for National Highway Transportation Safety Administration.
Non-Pressure Chamber Component part of service or combination brake used to attach chamber to
vehicle or trailer foundation brake.
GLOSSARY OF TERMS
Non-Pressure Housing
See “Non-Pressure Chamber”.
NPC
See “Non-Pressure Chamber”.
Pancake
Diaphragm.
Piggyback
Spring Brake or Parking Brake Chamber.
Piggyback Plus Kit
Piggyback, clamp band and diaphragm packaged as a “kit”.
Pintle Hook
Coupling device used in double, triple and truck-trailer combinations.
Plug
Plastic piece used to close “release bolt” hole in top of spring brake. Also
referred to as “cap”.
Storage pocket for release bolt. Usually located on side of flange case.
Ports
Threaded openings cast into “flange case” where air lines connect to chamber.
Pot
Brake Chamber or Actuator.
Pressure Cap
Steel or aluminum top for service chambers with one or two air inlet ports.
Pressure Transducer
Signals brake pedal application to Chassis Communications Module (CCM).
PSI
Pounds Per Square Inch.
Pull
Vehicle moves, or pulls, to one side when braking.
Pup
Short, 25 to 35 foot trailer or semi-trailer.
Push Rod
Rod protruding from a brake chamber that connects to a slack adjuster via a
clevis.
Pusher Axle
An additional axle, added to support heavy loads, may be able to be lifted off
the ground to save wear and tear on the tires when the truck or trailer is empty.
Usually mounted ahead of the drive axle.
Release Bolt
Used to “capture” or “cage” the spring brake portion of the brake chamber,
allowing the push rod to return to zero (0) stroke. Also referred to as a “Caging
Bolt”.
Note: Product information and specifications subject to change without notice.
174
TERMS
Return Spring
Conical shaped coiled spring used to return internal parts of service chamber
or spring brake to fully retracted position.
Rotochamber
Refers to actuator with a rolling diaphragm.
SAE
Abbreviation for Society of Automotive Engineers.
Semi-Trailer
A trailer designed to be towed with a fifth wheel on a converter dolly or
tractor.
Service Brake
Mechanism for slowing or stopping the vehicle.
Shipping Bolt
Short Stroke
Chamber fails to travel to maximum allowable stroke.
Single
Spring Brake or Parking Brake Chamber. Also referred to as the piggyback.
Single Axle
One axle on the rear of a truck, tractor or trailer.
Spanner Nut
Castellated nut on wedge tube. Used to “lock” tube into wedge housing.
Standard Stroke
Refers to actuators with 2.50 inch (63.5 mm) maximum stroke, or length of
stroke when actuator originally designed.
Stinger
Non-powered axle, mounted at rear of vehicle, behind “drive” axles. Can be
lifted off the ground to save wear and tear on the tires when the truck or
trailer is empty.
Stop Guard
Brand name for early MGM L and E Model Spring Brakes. Replaced by LTR-T
and TR Models.
Stroke
Maximum distance traveled by a brake chamber push rod, or slack adjuster
arm, during application.
Stroke Alert
Orange stripe or mark on service push rod that indicates when service
chamber is approaching 80% of its rated stoke.
Super Single
Extremely wide tire. Replaces “dual” tires with “single” tire.
Tag Axle
Non-powered axle that can be lifted off the ground to save wear and tear on
the tires when the truck or trailer is empty. Usually mounted to the rear of
“drive” axles. See “Lift Axle”.
Tandem
See “Combination”.
Tandem Axle
Two axles on the rear of a truck, tractor or trailer.
Tractor
Vehicle designed primarily to pull trailers by means of a fifth wheel
connection.
Note: Product information and specifications subject to change without notice.
175
GLOSSARY OF TERMS
Short “release bolt”, usually associated with brakes manufactured for
production installations.
Short Stop
Brand name for early MGM WM and WL Model Wedge Brakes.
TERMS
GLOSSARY OF TERMS
Tractor Trailer
Tractor and trailer in combination. Also know as a “Rig”. Tractor pulling a
semi-trailer.
Truck
Vehicle designed to “carry” cargo within a body or on a bed mounted on its
chassis.
Type
Refers to chamber size; i.e. 16, 20, 24, 30, 36, etc.
Un-Cage
Removal of “release bolt” or “caging” bolt.
VIN Number
Vehicle Identification Number or Serial Number.
Warning Light
Indicator light mounted on vehicle dash that illuminates to indicate status of
the e-STROKE System.
Wedge Brake
Brake shoes are applied by a single or double wedge-type mechanism as
opposed to brake applied by rotation of an “S-cam”.
Welded Yoke
Yoke permanently attached to service push rod.
X - Dimension
Measurement taken from bottom of NPC to end of push rod thread.
X-Pack
Large quantity of chambers packaged in one container. Also know as a “Bulk
Pack”.
Y - Dimension
Measurement taken from bottom of NPC to center-line of yoke pin.
Yoke
Connects service chamber push rod to slack adjuster. Also referred to as a
“Clevis”.
Zero Stroke
When service push rod is completely retracted into the service chamber.
Note: Product information and specifications subject to change without notice.
176
GLOSSARY OF TERMS
www.mgmbrakes.com
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: MGM Catalogue
Replacement Service Bulletin Number:
MFR Communication Date: 2017-12-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, HYDRAULIC
MFR Component System:
MFR Component Subsystem:
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