BENDIX A2LS Посібник - Сторінка 9

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2. Remove the tappet head and manual override assembly

from the wheel cylinder body, Figure 15. Separate the

tappet head from the manual override wheel.

3. Using a blunt screwdriver, pry the dust boots from the

housing and discard.

4. Carefully blow out both piston assemblies from the

cylinder housing using low pressure shop air. Remove

the small spring and locator assembly.

5. Unscrew the adjuster shaft assembly from the piston.

Note: Do not dismantle the adjuster shaft assembly.

6. Using a small screwdriver, with the end rounded and

polished, pry the seal from the piston, taking care not

to score the seal groove or piston surface.

EXPANDER DISASSEMBLY

Before proceeding, clean the exterior of the expander unit

and make sure the work area, tools, and hands are clean.

Place a clean sheet of paper on the work bench surface.

1. Place the expander unit in a bench vise with padded

jaws.

2. Compress the wedge return spring and remove the pin,

Figure 16. Slowly release the spring pressure and remove

spring along with the ferrule.

3. Use snap ring pliers to compress and remove the circlip

(snap ring), Figure 17.

4. Remove the dust boots from both ends of the expander

housing and discard. Note: The dust boots should not

be reused and must be replaced.

5. Remove the abutment tappet, input tappet/ piston and

stop pin from the housing.

6. Remove the wedge assembly, wedge seal, retaining ring

assembly and washer.

7. Push the roller tappet/piston from the housing in the

direction of the input tappet/piston, Figure 17. Note: Do

not slide the roller tappet/piston past the wedge turret.

8. Remove the bleed screw.

9. Using a small screwdriver, with the end rounded and

polished, pry the seals and o-ring from the input and

roller tappet/piston taking care not to score the seal

grooves or piston surface.

CLEANING AND INSPECTION

Discard all of the old parts that are to be replaced with

parts furnished in the repairs kits.

Clean all of the metal parts with unused DOT 4 brake fluid

or suitable solvent. Do not use gasoline or hot water solution

on metal parts.

Clean all rubber parts that are to be reused with clean DOT

4 heavy duty brake fluid. Place on clean sheet of paper to

dry.

Inspect all of the parts that are to be reused as outlined

below. Replace those parts that are damaged or excessively

worn.

1. Wedge assembly. Check the wedge shaft and wedge

surfaces for scoring. Check the rollers for scoring, pits,

cracks, and flat spots. Check the roller cage for fatigue

cracks.

2. Abutment Tappet. Check the abutment tappet for any

nicks, burrs or corrosion. Check the brake shoe web

slot for any burrs or damage. Smooth with a fine emery

cloth or clean.

3. Tappets/ Pistons. Check the outer surfaces for scoring,

pits, or nicks. Check the seal ring and o-ring grooves for

any nicks, burrs, or corrosion. Check the brake shoe

web slot of the expander input tappet/piston. Check the

inside of the piston for damaged threads. Smooth with a

fine emery cloth or clean as required.

GREASE

FIGURE 18 - EXPANDER LUBRICATION POINTS

DOT 4 FLUID

GREASE