NHTSA ID Number: 10189433
Manufacturer Communication Number: MGM Catalogue
TSB/Document Date: 2021-03-29
Summary
MGM Brakes catalogue
114.3
-
5.0
Spring Brake Force-Output (Newtons) @ mm. of Stroke
38.1
50.8
63.5
76.2
3314
3069
2847
2602
2380
2135
R5AHD
106.7
5.2
7651
7028
6405
5783
5160
R7A
69.9
4.1
2051
1908
1779
1637
-
4537
3892
-
-
-
-
R8H
-
63.5
-
103.5
25.4
2051
1908
1779
1637
-
88.9
101.6
(**) Brake chambers with 2.00” (50.8 mm) or less rated stroke are calibrated at 1.00” (25.4 mm) 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.
156
Note: Product information and specifications subject to change without notice.
PERFORMANCE CHART - SERVICE BRAKE CHAMBERS
METRIC
DOUBLE DIAPHRAGM SPRING BRAKE CHAMBERS
TR20xx
TR17xx
TR20xx
TR21xx
TR24xxL
TR27xx
TR30xx
TR20xxLP3H
TR24xxLP3
57.2
63.5
63.5
63.5
63.5
63.5
63.5
3.0
76.2
Vol. Displ.
@ 6.89
bar Rated
Service
Stroke
(cm3) (e)
875.1
934.4
937.2
1271.6
1143.8
1520.1
1425.7
1119.1
1363.4
Newton-meters of Torque Applied @
31.8mm Stroke by S-Cam Camshaft w/Slack
Adjuster Length of (mm)**
Service Brake Force-Output (Newtons) @ mm. Stroke (f)
Application
Pressure
of (bar)
25.4
31.8
38.1
44.5
50.8
57.2
63.5
69.9
76.2
127.0
139.7
152.4
165.1
1.4
1446
1446
1423
1379
1112
712
-
-
-
184
202
220
239
2.8
3158
3158
3069
2802
2402
1735
-
-
-
401
441
481
521
4.1
4804
4826
4804
4626
4003
2758
-
-
-
613
674
736
797
5.5
6272
6583
6539
6116
5338
3736
-
-
-
836
920
1003
1087
6.9
8007
8251
8207
7962
6672
5004
-
-
-
1048
1153
1258
1362
1.4
1106
1062
1016
952
862
733
535
-
-
135
148
162
175
2.8
2526
2485
2434
2350
2210
1981
1612
-
-
316
347
379
410
4.1
3927
3897
3851
3750
3568
3262
2760
-
-
495
544
594
643
5.5
5324
5313
5282
5174
4959
4593
3997
-
-
675
742
810
877
6.9
6721
6733
6720
6609
6364
5945
5255
-
-
855
941
1026
1112
1.4
1353
1356
1328
1276
1182
891
404
-
-
172
189
207
224
2.8
3008
3047
3015
2910
2713
2177
1315
-
-
387
426
464
503
4.1
4685
4756
4713
4581
4300
3602
2393
-
-
604
664
725
785
5.5
6369
6473
6420
6269
5924
5114
3612
-
-
822
904
986
1069
1348
6.9
8031
8166
- 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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