Technical Bulletins

Form #: EB 86-001

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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.

Form #: EB 86-002

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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.

Form #: EB 90-001

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

Form #: EB 91-001

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

Form #: EB 91-005

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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.

Form #: EB 91-006

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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.

Form #: EB 93-002

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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.

Form #: EB 96-002

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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.

Form #: EB 96-004

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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.

Form #: EB 96-005

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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 non pressure housing, flange case (center section), power spring or pushrod seals, which are reconditioned parts that are cleaned up and/or repainted.

Form #: EB 97-005

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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.

Form #: EB 01-003

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

Form #: EB 01-004

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

Form #: EB 02-001

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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.

Form #: EB 02-002

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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.

Form #: EB 03-002

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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.

Form #: EB 03-003

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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.

Form #: EB 03-004

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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.

Form #: EB 04-001

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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.

Form #: EB 04-002

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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.

Form #: EB 04-003

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

Form #: EB 04-004

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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.

Form #: EB 04-005

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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.

Form #: EB 06-001

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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.

Form #: EB 06-002

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

Form #: EB 06-003

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

Form #: EB 06-003FC

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

Form #: EB 06-003SP

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

Form #: EB 06-005

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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.

Form #: EB 07-001

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

Form #: EB 07-002

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This bulletin is to demonstrate a step by step Air Leak Test Procedure for field checking
J-Series actuators.

Form #: EB 07-003

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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.

Form #: EB 09-001

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

Form #: EB 10-001

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(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.

Form #: EB 10-003

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

Form #: EB 13-006

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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.

Form #: EB 15-003

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

Form #: EB 16-003

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

Form #: EB 17-001

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Clamp band coating change from Autophoretic to Trivalent Chromium. Affected MGM Part Numbers: Select type 9 and type 16 Service Chambers from the following part number families: 1009xxx, 1016xxx, 1416xxx, 1418xxx, and MJW1616ATxxx.

Form #: EB 19-005

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This bulletin provides a recommendation for inspection and service of MGM Brake’s brake actuator products which may have been exposed to flood water conditions or submersion in water. Most MGM brake actuators are not designed for use while submerged in water. Care must be taken to ensure brake actuators which may have been exposed to water submersion are safe for use prior to operating the vehicle. MGM Brakes offers a specific vented configuration for select brake actuator models which allows for operation during water fording situations. This is a specific configuration which must be requested and is not commonly used with on road applications.  

Form #: EB  20-001

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This manual provides instruction for proper inspection and service of MGM Brakes LTS double diaphragm long stroke actuators with integrated release bolt. The following sections provide a guide for brake actuator inspection, service and disposal.  

Form #: EB  20-002

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The LTS model is an enhanced version of the LTR which is a double diaphragm parking actuator that features a significant reduction in overall height, patented “Corrosion Fighter Technology” and a compact dual thread integrated release bolt. The LTS actuator includes equivalent function and performance as the LTR model but in a more compact size and with increased durability.

This bulletin provides a comparison of the LTS and LTR models. It is important to understand the similarities when conducting service part selection, inspections and installation.

Form #: EB  23-001

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This bulletin provides instruction for proper disposal of MGM Brakes R7A and R8H remote actuators.