Dodge RAM TRUCK 1500 1995 Service Manual page 220

5 - 43 DISC BRAKES
D I S C BRAKES
INDEX
page
Caliper Operation and Wear Compensation . . . . . . 48
Disc Brake Caliper Cleaning and Inspection . . . . . . 54
Disc Brake Caliper Disassembly 53
Disc Brake Caliper Installation 56
Disc Brake Caliper Overhaul and Reassembly . . . . 55
Disc Brake Caliper Removal 53
Disc Brake Rotor Inspection and Service 57
Disc Brake Rotor Installation (With Tapered
Bearings) 59
Disc Brake Rotor Installation (With Unit Bearings) . 61
GENERAL SERVICE INFORMATION
Caliper Tpes
BR models are equipped with Delco slider type,
front disc brake calipers. The calipers slide laterally
on the mounting bolts attaching each caliper to the
steering knuckle.
Caliper Sizes A i l Application
Two different caliper styles and three different cal­
iper bore sizes are used on BR models (Figs. 1, 2 and
3). Caliper styles are similar in appearance. The
main difference between them being physical size
and caliper mounting bolt bushing type.
Caliper piston bore sizes are:
• calipers on 1/2 ton models have a 75 mm (2.95 in.)
bore
• calipers on 3/4 ton models have an 80 mm (3.14
in.) bore
• calipers on 1 ton models have an 86 mm (3.38 in.) bore
The three different size calipers are not inter­
changeable. Use the specified caliper or compo­
nents when diagnosis indicates caliper or
component replacement is necessary. Do not in­
termix calipers, or components.
Brakeshoe Types And Wear Tabs
The outboard brakeshoes on all BR models have
wear tabs. The metal tabs are attached to the trail­
ing end of each outboard brakeshoe (Figs. 1, 2 and 3).
The tabs contact the rotor surface when lining mate­
rial has worn to a thickness of approximately 5 to 6
mm (3/16 to 1/4 in.). The resulting noise alerts the
driver that brakeshoe replacement is necessary.
The brakeshoes on 1/2 ton models are different
from those used on 3/4 and 1 ton models. Do not in­
termix the shoes for any reason.
Caliper Mounting
The calipers are attached directly to the steering
page
Disc Brake Rotor Removal (With Tapered Bearings) . . 58
Disc Brake Rotor Removal (With Unit Bearings) . . . 60
Disc Brakeshoe and Caliper Inspection 51
Disc Brakeshoe Installation 51
Disc Brakeshoe Removal . 50
Front Wheel Bearing Replacement 62
General Service Information 48
Wheel Bearing Adjustment (With Tapered Bearings) . . 59
Wheel Nut Tightening 62
Fig. 1 Model 1500 Disc Brake Caliper (75 mm Piston)
knuckles. Separate mounting brackets are not re­
quired. Caliper mounting arms are built right into
the knuckle (Fig. 4).
The caliper mounting bolts are encased within steel
collars. The collars are permanently attached to the
bolts and cannot be serviced separately.
CALIPER OPERATION AND WEAR COMPENSATION
Caliper Operation
The significant feature of single piston caliper op­
eration is that the calipers are free to slide laterally
on the mounting bolts. It is the freedom of lateral
movement that allows continuous compensation for
lining wear.