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SERVICE BRAKE (FULL AIR BRAKE) BR02–49
INSPECTION AND REPAIR
EN0680202H300003
! CAUTION
The MGM Brakes Tamper Resistant spring brake chambers are an
important part of your braking system. While they do not require
scheduled servicing, it is good preventative maintenance to make the
following routine inspections while they are in the shop for regular
servicing of other components or at a minimum of every 50,000 miles.
! WARNING
Your MGM brakes tamper resistant spring brake has been factory
sealed for your protection. There are no user-serviceable parts inside
the spring brake chamber. If you experience any damage or failure of
your spring brake chamber, remove either the entire actuator as in
section (3) of this manual, or the single (piggyback) as in section (5) of
this manual. See section (8) of this manual for disposal instructions.
Never attempt to disassemble the spring brake chamber as serious
personal injury could result from accidental sudden release of the
high energy spring.
1. RECOMMENDED INSPECTION POINTS
(1) The plastic END CAP on all "TR" and "TR-T" models requires no posi-
tioning or maintenance, but must be snapped tightly into place.
Inspect the cap for damage and replace as necessary. "TR-T" units
equipped with a breather tube and the white WEATHER SEAL END
CAP must be equipped with a rubber O-ring to ensure proper sealing
of the spring chamber.
Operating units equipped with the
BREATHER TUBE without the END CAP or DUST CAP securely in
place will void the MGM Brakes warranty without remedy
.
(2) Visually inspect the exterior surfaces of the unit for signs of damage
from outside sources, corrosion and/or rust. If any of these are seen
or suspected, cautiously remove the complete combination chamber
by following the directions in Section 3 on page BR02-51 of this man-
ual. Per CVSA out of service criteria any non-manufactured hole or
crack will place the vehicle out of service. (Not Shown)
(3) Inspect SERVICE BRAKE CLAMP RING to be sure it is securely in
place and damage free. If any damage is seen or suspected, cau-
tiously remove the complete piggyback/spring brake chamber by fol-
lowing directions in Section 5 on page BR02-54 of this manual.
MGM
Brakes recommends 30-35 Lbs.-Ft. torque on CLAMP BOLTS.
(4) Check to ensure the MOUNTING STUD NUTS are tightened to 133-
155 Lbs.-Ft. torque (clockwise) and washers are in place between
the nut and bracket.
(5) Inspect air lines, hoses and fittings attached to chamber. Replace any
damaged or leaking parts.
MGM Brakes recommends the fittings
be tightened to 25-30 Lbs.-Ft. torque into the chamber air inlet
ports
.
IMPORTANT
Inspect the air ports to determine the model of brake. Round
ports denote (2.50 inch) standard stroke model, square ports
denote (3.00 inch) long stroke model. This information is impor-
tant when replacing the service diaphragm and determining the
chamber's rated stroke.
(6) Inspect the PUSH-ROD to be sure it is working free, not bent, not
binding and is square to the chamber bottom within

3

in any direc-
tion at any point in the stroke of the chamber. If the PUSH-ROD is not
square, make corrections by repositioning the chamber on the mount-
ing bracket and/or by shimming the slack adjuster to the right or left on
the camshaft as required.
Model “TR” Series
SHTS068020200033