Dave's Place
1973 & Later M300 / M400 (RM350) / M500 (RM400) / M600
Dodge Motorhome Brake Reference Data
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75-Up: M-300 (73-74: RM300) |
75-Up: M-400 (73-74: RM350) |
75-Up: M-500 (73-74: RM400) |
76-Up: M-600 | ||
| Front Brakes | Type | Disc | Disc | Disc | Disc |
| Make | Chrysler | Kelsey-Hayes | Kelsey-Hayes | Kelsey-Hayes | |
| Actuation | Sliding Caliper | Sliding Caliper | Sliding Caliper | Sliding Caliper | |
| Rotor Diameter | 12.82" | 12.24" | 13.36" | 13.36" | |
| Rotor Thickness | 1.19" | 1.55" | 1.55" | 1.55" | |
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Rotor Lining Swept Area (Per Axle) |
249.4" | 230.7" | 255.6" | 255.6" | |
| Piston Diameter |
3.0" (1 per Caliper) |
2.38" (2 per Caliper) |
2.38" (2 per Caliper) |
2.38" (2 per Caliper) |
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75-Up: M-300 (73-74: RM300) |
75-Up: M-400 (73-74: RM350) |
75-Up: M-500 (73-74: RM400) |
76-Up: M-600 | ||
| Rear Brakes | Type | Drum | Drum | Drum | Drum |
| Make | Bendix | Bendix | Bendix | Bendix | |
| Actuation | Duo-Servo | Duo-Servo |
Twinplex (Note 1) |
Twinplex | |
| Drum/Disc Size | 12" x 3" | 12" x 3" | 15" x 4" | 15" x 4" | |
|
Lining Area (Per Axle) |
147.4" | 147.4" | 245.1" | 245.1" | |
|
Wheel Cylinders (Per Axle) |
1 | 1 | 2 | 2 | |
| Wheel Cylinder Bore | 1" |
1 1/16" (1.063") |
1 3/8" (1.375") |
1 3/8" (1.375") |
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75-Up: M-300 (73-74: RM300) |
75-Up: M-400 (73-74: RM350) |
75-Up: M-500 (73-74: RM400) |
76-Up: M-600 | ||
| Master Cylinder | Make |
Bendix (Dual) |
Bendix (Dual) |
Bendix (Dual) |
Bendix (Dual) |
| Bore |
1 1/8" (1.125") |
1 1/4" (1.25") |
1 1/4" (1.25") |
1 1/4" (1.25") |
|
| Stroke |
1 5/16" (1.31") |
1 19/32" (1.59") |
1 19/32" (1.59") |
1 19/32" (1.59") |
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75-Up: M-300 (73-74: RM300) |
75-Up: M-400 (73-74: RM350) |
75-Up: M-500 (73-74: RM400) |
76-Up: M-600 | ||
| Power Brake Booster | Make | Bendix | Bendix | Bendix | Bendix |
| Model | Master-Vac |
73-75: Hydro-Vac 76-81: Hydroboost |
73-75: Hydro-Vac 76-81: Hydroboost |
Hydroboost | |
| No. Used | 1 |
73-75: 2 76-81: 1 |
73-75: 2 76-81: 1 |
2 | |
| Mounting |
Bracket with Master Cylinder |
73-75: Frame Rail 76-81: Bracket with Master Cylinder |
73-75: Frame Rail 76-81: Bracket with Master Cylinder |
Bracket with Master Cylinder |
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Brake Warning Switch (Note 2) |
Yes | Yes | Yes | Yes | |
|
Metering Valve (PSI Cut-in) (Note 2) |
117 | 117 | 117 | 117 | |
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Notes:
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