Chrysler RAM TRUCK 2500 1994 Service Manual page 160

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BRAKES
BRAKES 5 - 1
C O N T E N T S
page
ALL-WHEEL ANTILOCK BRAKE SYSTEM (ABS) . 35
DISC BRAKES 45
DRUM BRAKES 60
GENERAL INFORMATION 1
MASTER CYLINDER 8
PARKING BRAKES 70
POWER BRAKE BOOSTER—BRAKE PEDAL—
BRAKELIGHT SWITCH 15
page
POWER BRAKE VACUUM PUMP (DIESEL
MODELS) 20
REAR WHEEL ANTILOCK BRAKE (RWAL)
SYSTEM 25
SERVICE BRAKE DIAGNOSIS 3
SPECIFICATIONS 73
G E N E R A L INFORMATION
INDEX
page
Antilock Brake Systems 2
Brake Adjustments and Bleeding Procedures 2
Brake Fluid/Lubricants/Cleaning Solvents 2
Brake Safety Precautions 2
page
Brake Warning Lights 2
Model Identification 2
Service Brake Components 1
SERVICE BRAKE COMPONENTS
The standard service brake system on 1994 BR
truck models consists of power assisted, front disc
and rear drum brakes.
Rear wheel antilock (RWAL) brakes are standard
equipment with an all-wheel antilock (ABS) brake
system available as an option.
Front Disc Brakes
Front disc brakes consist of single piston, floating style
calipers. Brakeshoe lining material is semi metallic. Vented
disc brake rotors are used for all applications.
Three different calipers are used. They are identi­
fied by caliper piston size and model application
which are:
• calipers on 1500 models have a 75 mm (2.95 in.) pis­
ton
• calipers on 2500 models have an 80 mm (3.1 in.) pis­
ton
• calipers on 3500 models and 2500 4 x 4 models
with Dana 60 front axle have an 86 mm (3.385 in.)
piston
Rear Drum Brakes
Rear drum brakes are dual shoe units with an au­
tomatic adjustment mechanism. Three different drum
brake assemblies are used:
• 11 x 2 in. rear drum brakes are used on 1/2 ton
models
• 13 x 2.5 in. rear drum brakes are used on 3/4 ton
models
• 13 x 3.5 in. rear drum brakes are used on one-ton
models
Brakelining Material
The brakelining material used for the front disc and
rear drum brakes is asbestos free. Service replace­
ment brakelining provided through the Mopar parts
system will also be asbestos free.
Master Cylinder/Power Brake Booster
A two section master cylinder and tandem (dual) di­
aphragm, vacuum power brake booster is used for all
applications. Models with the Cummins diesel engine
option are also equipped with a vacuum pump assem­
bly to operate the power brake booster.