Clamp-Type Brake Chambers
Type | Outside diameter | Brake readjustment limit: standard stroke chamber | Brake readjustment limit: long stroke chamber |
6 | 4 1/2 in. (114 mm) | 1 1/4 in. (31.8 mm) | |
9 | 5 1/4 in. (133 mm) | 1 3/8 in. (34.9 mm) | |
12 | 5 11/16 in. (145 mm) | 1 3/8 in. (34.9 mm) | 1 3/4 in. (44.5 mm). |
16 | 6 3/8 in. (162 mm) | 1 3/4 in. (44.5 mm) | 2 in. (50.8 mm). |
20 | 6 25/32 in. (172 mm) | 1 3/4 in. (44.5 mm) | 2 in. (50.8 mm). 2 1/2 in. (63.5 mm).1 |
24 | 7 7/32 in. (184 mm) | 1 3/4 in. (44.5 mm) | 2 in. (50.8 mm). 2 1/2 in. (63.5 mm).2 |
30 | 8 3/32 in. (206 mm) | 2 in. (50.8 mm) | 2 1/2 in. (63.5 mm). |
36 | 9 in. (229 mm) | 2 1/2 in. (63.5 mm) |
1 For type 20 chambers with a 3-inch (76 mm) rated stroke.
2 For type 24 chambers with a 3-inch (76 mm) rated stroke.
Bendix DD-3 Brake Chambers
Type | Outside diameter | Brake readjustment limit |
30 | 8 1/8 in. (206 mm) | 2 1/4 in. (57.2 mm). |
Bolt-Type Brake Chambers
Type | Outside diameter | Brake readjustment limit |
A | 6 15/16 in. (176 mm) | 1 3/8 in. (34.9 mm). |
B | 9 3/16 in. (234 mm) | 1 3/4 in. (44.5 mm). |
C | 8 1/16 in. (205 mm) | 1 3/4 in. (44.5 mm). |
D | 5 1/4 in. (133 mm) | 1 1/4 in. (31.8 mm). |
E | 6 3/16 in. (157 mm) | 1 3/8 in. (34.9 mm). |
F | 11 in. (279 mm) | 2 1/4 in. (57.2 mm). |
G | 9 7/8 in. (251 mm) | 2 in. (50.8 mm). |
Rotochamber-Type Brake Chambers
Type | Outside diameter | Brake readjustment limit |
9 | 4 9/32 in. (109 mm) | 1 1/2 in. (38.1 mm). |
12 | 4 13/16 in. (122 mm) | 1 1/2 in. (38.1 mm). |
16 | 5 13/32 in. (138 mm) | 2 in. (50.8 mm). |
20 | 5 15/16 in. (151 mm) | 2 in. (50.8 mm). |
24 | 6 13/32 in. (163 mm) | 2 in. (50.8 mm). |
30 | 7 1/16 in. (180 mm) | 2 1/4 in. (57.2 mm). |
36 | 7 5/8 in. (194 mm) | 2 3/4 in. (69.9 mm). |
50 | 8 7/8 in. (226 mm) | 3 in. (76.2 mm). |
49 C.F.R. §393.47