NHTSA ID Number: 10189433
Manufacturer Communication Number: MGM Catalogue
TSB/Document Date: 2021-03-29
Summary
MGM Brakes catalogue
PISTON TYPE SPRING BRAKE CHAMBERS
TECHNICAL
MJ_xx16AT
16
1.75
44.4
78
1404
1310
1211
1098
-
-
-
-
-
7020
7722
8424
9126
MJ_xx22ET
22
3.00
98.5
68
1780
1725
1624
1546
1468
1389
1310
1230
1151
8625
9488
10350
11213
MJ_xx24BT
24
2.00
83.3
71
2000
1922
1842
1771
1696
-
-
-
-
10000
11000
12000
13000
MJ_xx24ET
24
3.00
98.5
71
2000
1922
1842
1771
1696
1607
1528
1449
1370
9610
10571
11532
12493
MJ_xx28ET
28
3.00
128.4
73
2423
2320
2207
2070
1982
1870
1756
1670
1521
11600
12760
13920
15080
MJ_xx30ET
30
3.00
128.4
75
2556
2450
2350
2256
2183
2086
1987
1858
1657
12250
13475
14700
15925
REMOTE MOUNT CYLINDERS
MODELS
-
Rated
Stroke (in)
-
Hold-Off
Pressure
(psi)
Spring Brake Force-Output (Pounds-Force) @ in. of stroke
1.00
1.50
2.00
2.50
3.00
3.50
4.00
R4A
-
4.50
-
73
800
745
690
640
585
535
480
R5AHD
-
4.20
-
75
1720
1580
1440
1300
1160
1020
875
R7A
2.75
56
461
429
400
368
R8H
2.75
1500
461
429
400
368
(**) Brake chambers with 2.00” or less rated stroke are calculated at 1.00” stroke.
(a) Spring chamber volume measured at full “OFF” (zero) stroke. Reference SAE J1469
(b) Hold off pressure measured as decreasing air pressure required to activate spring chamber to within .020” (5 mm) of full “OFF” (deactivated) stroke.
(c) Spring brake force output measured at end of service chamber push-rod using power springs which have been held compressed to assembly shut height for 24 hours to remove initial false
load. Forces shown are nominal performance (+/- 10%) for all spring chamber model sizes.
(d) Performance levels shown hold true for all design versions of the same model size. For example… read the performance for Models TR2430T and TR3030TS as shown above for Model
TRXX30 for spring brake force output.
150
Note: Product information and specifications subject to change without notice.
PERFORMANCE CHART - SERVICE BRAKE CHAMBERS
DOUBLE DIAPHRAGM SPRING BRAKE CHAMBERS - SAE
TR20xx
TR17xx
TR20xx
TR21xxL
TR24xxL
TR27xx
TR30xx
TR20xxLP3H
TR24xxLP3
TR30xxLP3
Vol.
Displ. @
100 psi
Rated
Service
Stroke
(in3) (e)
Application
Pressure
of (psi)
2.25
53.4
2.50
2.50
2.50
2.50
2.50
2.50
3.00
3.00
3.00
57.02
57.19
77.6
69.8
92.76
87
68.29
83.2
107.5
in-lbs. of Torque Applied @ 1.25” Stroke
by S-Cam Camshaft w/Slack Adjuster
Length of (in)**
Service Brake Force-Output (Pounds-Force) @ in. of Stroke (f)
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
5.00
5.50
6.00
6.50
20
325
325
320
310
250
160
-
-
-
1625
1788
1950
2113
40
710
710
690
630
540
390
-
-
-
3550
3905
4260
4615
60
1080
1085
1080
1040
900
620
-
-
-
5400
5940
6480
7020
80
1410
1480
1470
1375
1200
840
-
-
-
7050
7755
8460
9165
100
1800
1855
1845
1790
1500
1125
-
-
-
9000
9900
10800
11700
20
303
306
303
291
274
221
120
-
-
1532
- 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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