ALTRACO ELECTRONIC DISC BRAKE CALIPER Especificações descarregar pdf (Página 14)

Section 3

Inspection

WARNING

To prevent serious eye injury, always wear safe

eye protection when you perform vehicle

maintenance or service.

Inspect Parts

Linings and End Plates

CAUTION

Always replace both linings with specified parts.

If you only replace one lining, damage to the disc

can occur. If you use non-Meritor parts, incorrect

brake operation can occur. Damage to

components can result.

1. Remove the linings. Inspect the linings for wear

and damage. Replace damaged linings.

2. Replace the linings if you find the following

conditions:

• The thickness is 0.125-inch (3.2 mm) from

the backplate.

• Each lining has a different thickness.

• The linings are contaminated with oil or

grease.

• The linings have large or deep cracks. Small,

tight cracks (heat checks) on the lining’s

surface, which are caused by high

temperatures, are normal.

3. Inspect the end plate and end plate bolts for

wear. Replace worn or damaged end plates and

bolts.

Dust Seals

Check that the dust seals are soft and flexible.

Replace worn or damaged seals.

Disc

If the disc is worn beyond the specifications in

Figure 3.1, replace the disc. Also refer to the vehicle

manufacturer’s specifications that may be different

from those below.

Caliper

1. Inspect the pistons, housing bores and O-ring

grooves. Use a fine emery cloth to remove

scratches or corrosion. Replace worn or

damaged components. Replace components that

are heavily corroded or have large scratches.

2. Check the pistons for correct operation. Replace

the piston and housing if a piston is not straight

in the bore.

3. If fluid leaks at a piston, disassemble the caliper.

Inspect the piston, bore, O-rings and the back-up

rings. Service as necessary.

4. Measure the outer diameter of the piston.

Replace the piston if the outer diameter is less

than 2.995 inches (76.07 mm).

5. Measure the outer diameter of the housing bore.

Replace the housing if the diameter exceeds

3.003 inches (76.28 mm).

Figure 3.1

Maximum

Original Disc Disc Wear Minimum

Model Thickness Each Side Disc Thickness

HDB 640 1.574 inch 0.06 inch 1.450 inch

(40 mm) (1.5 mm) (36.83 mm)

SCL 35, 0.625 inch 0.06 inch 0.50 inch

46 and 53 (15.875 mm) (1.5 mm) (12.7 mm)

MINIMUM DISC

THICKNESS

MAXIMUM DISC

WEAR EACH SIDE

ORIGINAL DISC

THICKNESS

MAXIMUM

DISC WEAR

Typical Section Through Disc Showing

Recommended Maximum Wear Limits

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 24 25

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