Technical Bulletins

MGM Brakes has extensive collection of technical support literature at your fingertips. Service manuals, users guides and technical bulletins ranging from how to do field service work to addressing safety issues are available for immediate use.  

 

 

Field Modification of S-Cam Service Brake Chamber Piston Rods

Form #: EB 86-001

(Download only at this time)

MGM Brakes product warranty will be voided for any S-Cam Service Chamber or Combination Spring Brake Assembly which has been field modified by having additional and/or new threads cut or machined on the piston rod.

 

 

 

Guidelines for Mounting Spring Brakes to Brackets (with Vertical or Horizontal Bolt Hole Locations)

Form #: EB 86-002

(Download only at this time)

Spring brake mounting brackets are designed with the mounting bolt holes in a vertical line relative to the axle or in a horizontal line or slightly angles from horizontal relative to the axle. It is imperative that a spring brake with a specific non-pressure chamber (mounting plate) be mounted to the right bracket.

 

 

 

MGM Brakes Service Chamber Diaphragm Replacement Procedure

Form #: EB 86-004

(Download only at this time)

This is a nine step procedure to replace a diaphragm.

 

 

 

Instructions for Spring Chambers/Piggybacks with "Breather Tube"

Form #: EB 90-001

(Download only at this time)

This is installation instructions for installing a chamber with a breather tube.

 

 

 

Product Identification Plate

Form #: EB 90-003

(Download only at this time)

All MGM brake actuators made after October - 1987 have an aluminum identification plate attached to the actuator which contains the MGM part number, date code, and often a customer part number.

 

 

 

Identifying an MGM Brakes Product

Form #: EB 90-004

(Download only at this time)

All MGM brake actuators are easily identified by the part number and the MGM logo. The MGM seven digit part number should be found on the product identification tag. The MGM logo is found on various parts of the actuators.

 

 

 

Manual Release Bolt - MAGNUM MB-T and MAGNUM MG-T Piston Type Brakes

Form #: EB 91-001

(Download only at this time)

The Manual Release Bolt is the drive mechanism for spring brake application on these model brakes.

 

 

 

Manual Release Bolt Magnum MB-T and MG-T Piston Type Brakes Method of Operation

Form #: EB 91-005

(Download only at this time)

The MGM Magnum Spring Brake release bolt operates differently than the double diaphragm release bolt. When the release bolt is installed and tightened down, spring force is transmitted through the spring piston, to the release bolt, to the pushrod, and on to the service piston rod to provide parking brake force.

 

 

 

Type 24 Long Stroke Diaphragms

Form #: EB 91-006

(Download only at this time)

There has been some confusion about part numbers for the Type 24 long stroke diaphragm. Any MGM part number 8017_41 diaphragm can be used in a type 24 long stroke (2.50 inch) brake actuator. The fifth digit of the number is used for MGM’s internal tracking and should not concern the customer.

 

 

 

Procedure for Shipping Chambers (ONLY When Air Pressure is Unavailable)

Form #: EB 92-001

(Download only at this time)

This procedure is to be used only if air pressure is not available.

 

 

 

Brakes Camshaft Rotation Recommendation

Form #: EB 93-002

(Download only at this time)

It is recommended that service brake chambers, service and spring brake chambers be installed on vehicle axles so that the rotation of the brake camshaft is in the same direction as the rotation of the wheel and drum in forward vehicle travel.

 

 

 

Causes of Non-Pressure Chamber Failures and Recommended Corrective Action

Form #: EB 96-002

(Download only at this time)

Some severe service type vehicles can cause non-pressure chamber (mounting plate) failures. Usually these failures result in cracks that originate at one of the mounting bolts and propagates towards the outside diameter. If left undetected, the mounting bolt may eventually pull loose from the steel stamped housing. This bulletin lists some of the causes of a failure and recommended corrective action.

 

 

 

Breather Tube Extension Procedure

Form #: EB 96-004

(Download only at this time)

The purpose of this bulletin is to provide a procedure to add a tube section to lengthen a breather tube in the field when the single/piggyback is rotated to reposition the ports relative to the non-pressure chamber housing.

 

 

 

Rebuilt Air Brake Actuators for Trucks/Tractors, Buses & Trailers

Form #: EB 96-005

(Download only at this time)

MGM Brakes does not rebuild or condone the use of rebuilt air brake actuators. Air brake actuators are a very important safety device because they actuate the foundation brakes and also perform vital parking and emergency brake functions. They operate in the worst possible environment and under the most severe conditions. It is not possible to determine the condition and remaining life in the critical components reused in rebuilt actuators, such as the nonpressure housing, flange case (center section), power spring or pushrod seals, which are reconditioned parts that are cleaned up and/or repainted.

 

 

 

Type 24 Diaphragms

Form #: EB 97-004

(Download only at this time)

In an effort to eliminate the confusion caused by the recommended use of the “conventional” (2.25 inch stroke) diaphragm for both Type 24 “conventional” (2.25 inch) and “long stroke” (2.50 inch) applications, MGM Brakes has decided to reinstate P/N 8017141 and gives its recommendation for use.

 

 

 

Installation and Location Instructions for Long Stroke Tag on Single/Piggyback Units

Form #: EB 97-005

(Download only at this time)

When replacing with an MGM TR3 3-inch stroke “Piggyback Plus” Kit, be sure to install the enclosed Standardized Trapezoidal Shaped I.D. Tag to one of the service side clamp band bolts and securely fasten it in place with the enclosed pal-nut as shown.

 

 

 

Push-Rod Replacement Procedure for Models TR & TR-LP3

Form #: EB 01-003

(Download only at this time)

This is an eleven step procedure to replace a push-rod for models TR and TR-LP3.

 

 

 

Push-Rod Replacement Procedure for Models LTR & LTR-L3

Form #: EB 01-004

(Download only at this time)

This is an eleven step procedure to replace a push-rod for models LTR and LTR-L3.

 

 

 

Field Replacement of Type 30 - 2.5" Stroke Diaphragm & Clamp Band

Form #: EB 02-001

(Download only at this time)

As part of MGM’s continuous improvement philosophy, MGM has introduced a new, patented Type 30, 2.5”/64mm stroke “Easy-Fit” diaphragm design and an improved Type 30 clamp band. This bulletin includes detailed instructions on diaphragm replacement.

 

 

 

Mixing Standard & Long Stroke Chambers

Form #: EB 02-002

(Download only at this time)

MGM Brakes recommends replacing chambers with the same stroke rating across an axle. When servicing a truck/trailer equipped with either standard stroke or long stroke chambers, it is crucial that replacement of the chambers be like for like. For example: if a 3-inch stroke chamber is to replace a 2.5-inch stroke chamber, both chambers on that axle must be upgraded to 3-inch chambers.

 

 

 

MGM Brakes Actuators Manufactured with Neoprene Diaphragms

Form #: EB 03-001

(Download only at this time)

MGM Brakes manufactures a limited line of service chambers and spring brakes with “Neoprene” diaphragms for severe service applications where petroleum saturated contaminants may enter the air system and come into contact with the diaphragms.

 

 

 

Field Replacement of MGM Brakes Chambers Equipped with Welded Yokes

Form #: EB 03-002

(Download only at this time)

Every day, more and more vehicles are being manufactured with 3-Inch “long stroke” spring brakes and service chambers with the yoke “welded” to the service push rod. Because the “welded” yoke is permanently attached to the push-rod, it is virtually impossible to remove and re-use it.

 

 

 

Replacement Units for MGM Brakes 3-Inch Long Stroke Chambers with Welded Yokes

Form #: EB 03-003

(Download only at this time)

As MGM 3-Inch “Long Stroke” spring brakes and service chambers become standard equipment on more and more new trucks and trailers, it is important to note that many of these units will be fitted with the MGM Brakes’ “Welded” Yoke.

 

 

 

Procedure for Determining Correct Push-Rod Length - Field Replacement

Form #: EB 03-004

(Download only at this time)

This procedure will explain how to determine the correct push rod length when the old unit is unavailable or there is concern the push rod length was incorrectly established during a previous installation.

 

 

 

Type 12 Diaphragms - S-Cam & Wedge Installations

Form #: EB 04-001

(Download only at this time)

MGM Brakes offers two different Type 12 Diaphragms for aftermarket replacement, P/N 8017112 and P/N 8017312. While these diaphragms are similar in diameter, composition, etc., they are distinctly different in height, and mixing them may result in reduction of the chamber’s stroke.

 

 

 

Full Releases of Parking Brake Chamber

Form #: EB 04-002

(Download only at this time)

MGM spring brake chambers must return to zero stroke to fully release the foundation brakes and for proper readjustment of automatic slack adjusters. For TR, TR-T and TR-TS Models.

 

 

 

Procedure to Re-tighten Service Actuator Clamp Band

Form #: EB 04-003

(Download only at this time)

In the event the service clamp band needs to be retightened due to air leakage it is advisable to perform this procedure.

 

 

 

Weatherseal Plug Installation Instruction

Form #: EB 04-004

(Download only at this time)

In order for the brake to function properly and to maintain the warranty coverage, the Weatherseal Plug™ must be firmly snapped into place in the release tool access hole. Follow these instructions for easy installation.

 

 

 

Replacing Piggyback Chambers - 2.5 inch stroke vs. 3.0 inch stroke

Form #: EB 04-005

(Download only at this time)

When servicing a truck/trailer/bus equipped with either standard stroke or long stroke chambers, it is crucial that replacement of the piggyback chambers be like-for-like. For example: A 2.5-inch stroke piggyback chamber must be replaced with a 2.5-inch stroke piggyback chamber.

 

 

 

Breather Tube Extension using Clamps

Form #: EB 06-001

(Download only at this time)

This bulletin provides a procedure to add a tube section to lengthen a breather tube in the field when the replacement actuator needs to be modified to replicate the breather tube, and/or port positions as per the currently installed OEM actuator.

 

 

 

MGM Brakes Model Replacement - New Magnum Piston-Type Spring Brake. MGM Model MJW1624BT Replaces Model WM1624LGT (2017xxx)

Form #: EB 06-002

(Download only at this time)

This is to advise the customer that the WM1624LGT (2017XXX) has been replaced by a new model, the MJW1624BT. Effective date: October 2006.

 

 

 

INDUSTRY SAFETY REMINDER - DOUBLE CLAMP BANDED SPRING BRAKES

Form #: EB 06-003

(Download only at this time)

MGM Brakes believes the industry needs to be reminded of the dangers associated with servicing double clamp banded spring brakes.

 

 

 

RAPPEL À L'INDUSTRIE AU SUJET DE LA SÉCURITÉ. Freins à ressort à double collier d'attache

Form #: EB 06-003FC

(Download only at this time)

MGM Brakes believes the industry needs to be reminded of the dangers associated with servicing double clamp banded spring brakes. French Canadian version.

 

 

 

RECORDATORIO DE SEGURIDAD PARA LA INDUSTRIA. Frenos de Resorte con Doble Abrazadera de Banda

Form #: EB 06-003SP

(Download only at this time)

MGM Brakes believes the industry needs to be reminded of the dangers associated with servicing double clamp banded spring brakes. Spanish version.

 

 

 

J-Series Brake Head Movement - In the Roll Area

Form #: EB 06-005

(Download only at this time)

The roll process for the J-series Spring Brake design displaces a circumferential strip of head material into the securing groove in the flange case by a cold forming operation. The inward radial deformation of the head material, which occurs during the roll process, imparts residual stresses into the head material comparable to similar cold forming operations.

 

 

 

Hexavalent Chromium Replacement

Form #: EB 06-006

(Download only at this time)

This bulletin is to notify customers of coating conversion from current Yellow Zinc Dichromate (hexavalent chromium) to clear trivalent chromate.

 

 

 

Zinc Iron Chromate Replacement

Form #: EB 07-001

(Download only at this time)

This bulletin is to notify customers of coating conversion from current Zinc Iron Chromate (hexavalent chromium) to epoxy paint.

 

 

 

MJS Service Diaphragm Replacement

Form #: EB 07-003

(Download only at this time)

This bulletin is to notify customers of the availability of “reinforced” diaphragms for use in MJS Model Chambers with spring brake parking force-output (pounds-force) in excess of 2300 lbs. at 1¼-inches of stroke: i.e. MJSxx28 and xx30.

 

 

 

Hydraulic Driveline Brake Service Kit Installation

Form #: EB 09-001

(Download only at this time)

The following installation instructions shall be used when installing the hydraulic cartridge service kit.

 

 

 

Model Design Improvement TRXX30 and TRXX30HD

Form #: EB 10-001

(Download only at this time)

(Beginning July 2010 - expected completion of units is November 2010)

This bulletin is to advise the customer that the TRXX30 and TRXX30HD units have been converted to utilize the MGM patented center hole design with “CORROSION FIGHTER TECHNOLOGY”, refer to MGM Form 5092.

 

 

 

Obsolete TR3030S and Replace with TR3030TS Models

Form #: EB 10-003

(Download only at this time)

This bulletin is to advise the customer that the TR3030S models have been placed obsolete and replaced with the TR3030TS models.

 

 

 

Air Disc Brake Actuator Service Manual

Form #: EB 13-006

(Download only at this time)

MGM Brakes service and spring brake actuators are important parts of your air disc braking system. These actuators contain no serviceable parts and are not to be dis-assembled. The following instructions cover the inspection, removal and installation of service and spring brake actuators on air disc brakes.

 

 

 

Neoprene Diaphragm Wear Characteristics

Form #: EB 15-003

(Download only at this time)

This bulletin is to explain the wear characteristics of a neoprene diaphragm.

 

 

 

Component Change Notification

Form #: EB 16-003

(Download only at this time)

Material/Process change to the internal Pushrod Guide Bushing used in all MGM J-Series Piston Parking Brake Actuators.

 
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