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Dodge Motorhome
Manual Information |
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M-300
1969-73 |
M-375
1969-73 |
75-Up: M-300 |
75-Up: M-400 |
75-Up: M-500 |
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Early |
Late |
Early
69-71 |
Late
72-73 |
(73-74: RM300) |
(73-74: RM350) |
(73-74: RM400) |
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| Front Brakes |
Type |
Drum |
Drum |
Drum |
Drum |
Disc |
Disc |
Disc |
| Make |
Bendix |
Bendix |
Chrysler |
Bendix |
Chrysler |
Kelsey-Hayes |
Kelsey-Hayes |
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Actuation |
Duo-Servo |
Duo-Servo |
Lockheed |
Duo-Servo |
Sliding Caliper |
Sliding Caliper |
Sliding Caliper |
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Drum/Disc Size |
12 1/8" x 2" |
12" x 3" |
14.12" x 2" |
14.2" x 2.5" |
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Lining Area
(Per Axle) |
104.7" |
147.4" |
119.3" |
143.4" |
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Rotor Size: Dia |
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12.82" |
12.24" |
13.36" |
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Thickness |
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1.19" |
1.55" |
1.55 |
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Lining Swept Area
(Per Axle) |
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249.4" |
230.7" |
255.6" |
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Wheel Cylinder Bore |
1 1/8"
(1.125") |
1 1/8"
(1.125") |
1 1/2"
(1.5") |
1 1/16"
(1.063") |
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Piston Diameter |
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3.0" |
2.38"
(2/Caliper) |
2.38"
(2/Caliper) |
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The Chrysler version is
mentioned in the Dodge MH Chassis Manual but is not in supported in either
the Dodge MH Chassis or Parts Manual |
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| Rear Brakes |
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M-300
1969-73 |
M-375
1969-73 |
75-Up: M-300 |
75-Up: M-400 |
75-Up: M-500 |
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Early |
Late |
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(73-74: RM300) |
(73-74: RM350) |
(73-74: RM400) |
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Type |
Drum |
Drum |
Drum |
Drum |
Drum |
Drum |
| Make |
Bendix |
Bendix |
Bendix |
Bendix |
Bendix |
Bendix |
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Actuation |
Duo-Servo |
Duo-Servo
Note 1 |
Twinplex
Note 2 |
Duo-Servo |
Duo-Servo |
Twinplex
Note 3 |
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Drum Size |
13" x 2.5" |
12" x 3" |
14 1/8" x 3"
(14.125" x 3") |
12" x 3" |
12" x 3" |
15" x 4" |
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Lining Area
(Per Axle) |
133.2" |
147.4" |
173.1" |
147.4" |
147.4" |
245.1" |
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Wheel Cylinders Per Axle |
1 |
1 |
2 |
1 |
1 |
2 |
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Wheel Cylinder Bore |
1 1/4"
(1.25") |
1 1/16"
(1.06") |
1 3/8"
(1.375") |
1" |
1 1/16"
(1.06") |
1 3/8"
(1.375") |
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This drum size is not in
supported in the Dodge MH Parts Manual |
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Master
Cylinder |
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M-300
1969-73 |
M-375
1969-73 |
75-Up: M-300 |
75-Up: M-400 |
75-Up: M-500 |
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Early |
Late |
Early
69-71 |
Late
72-73 |
(73-74: RM300) |
(73-74: RM350) |
(73-74: RM400) |
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Make |
Bendix
(Dual) |
Bendix
(Dual) |
Chrysler
(Single) |
Wagner
(Dual) |
Bendix
(Dual) |
Bendix
(Dual) |
Bendix
(Dual) |
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Bore |
1 1/4"
(1.25") |
1 1/8"
(1.125") |
1 1/2"
(1.5") |
1 3/4"
(1.75") |
1 1/8"
(1.125") |
1 1/4"
(1.25") |
1 1/4"
(1.25") |
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Stroke |
1 5/16"
(1.31") |
1 5/16"
(1.31") |
1 7/16"
(1.44") |
1 31/64"
(1.48") |
1 5/16"
(1.31") |
1 19/32"
(1.59") |
1 19/32"
(1.59") |
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Brake Warning Switch |
Yes |
Yes |
No |
Yes |
Yes * |
Yes * |
Yes * |
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Metering Valve
(PSI Cut-in) |
--- |
--- |
--- |
--- |
117 * |
117 * |
117 * |
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* Brake Switch and Metering valve combined into
a single unit, attached to left frame rail. |
Power
Brake
Booster |
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M-300
1969-73 |
M-375
1969-73 |
75-Up: M-300 |
75-Up: M-400 |
75-Up: M-500 |
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Early |
Late |
Early
69-71 |
Late
72-73 |
(73-74: RM300) |
(73-74: RM350) |
(73-74: RM400) |
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Make |
Midland
Ross |
Bendix |
Midland
Ross |
Bendix |
Bendix |
Bendix |
Bendix |
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Model |
C-490G |
Master Vac |
C-464R |
Hydrovac |
Master Vac |
Hydrovac |
Hydrovac |
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No. Used |
2 |
1 |
1 |
2 |
1 |
2 |
2 |
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Mounting |
Frame Rail |
Bracket with Master Cylinder |
Frame Rail |
Frame Rail |
Bracket with Master Cylinder |
Frame Rail |
Frame Rail |
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For 76-Up M400/500/600, the Hydroboost system
is installed. The Hydroboost system
operates off of the Power Steering Pump.
A vacuum based booster unit is not installed. |
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Note 1: M300 Parking Brake was moved to rear
wheel on 1 April 72
Note 2: M375 - Prior
to Febuary 1971, M375 has a single hydralic system and the rear upper/lower
wheel cylinders are interconnected. After Febuary 1971, M375 has a split
Front/Rear hydralic system and each rear upper/lower wheel cylinder was fed
individually.
Note 3: RM400 has a
split Front/Rear hydralic system and each rear upper/lower wheel cylinder
pair is interconnected. |
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