ALTRACO ELECTRONIC DISC BRAKE CALIPER Manual de servicio descargar pdf (Pagina 10)

and adjust the spindle nut and install a new cotter pin.

Check that the rotor turns freely. Bearing service will be

covered in more detail in Chapter 17.

Final System Check and Road Test

Reinstall the tires and torque the lug nuts to specifica-

tions using a torque wrench or torque sticks, if available.

Simply tightening the lug nuts with an impact wrench can

lead to uneven torque, which could distort rotors and lead

to pulsation. Check the master cylinder reservoir and add

fluid if necessary. After adding fluid, pump the brakes a

few times to set the pad to rotor clearances. If necessary,

bleed the brake system.

Bedding-in Brake Pads

Road test the vehicle, making at least ten gentle

stops to seat the linings. This process is referred to as

bedding-in. Accelerate to about 35-40 mph (56-64 kph),

then apply the brakes with light to moderate pressure to

reduce speed to approximately 5 mph (8 kph); do not

come to a full stop. Allow at least 1/3 mile between stops.

Allow the brakes to cool completely before releasing the

vehicle to the customer.

While making these stops, be alert for noises, hard

pedal, and pulsation. If the rear brakes were serviced,

make sure that the parking brake works properly. It is a

good idea to check the parking brake even if the rear

brakes were not serviced. After you are sure that the vehi-

cle stops properly, return it to the owner. Caution the

owner to avoid hard prolonged braking for at least 200

miles (320 km).

Summary

Common disc brake problems are noise, pulsation,

and a hard pedal. The caliper hydraulic system is usually

trouble free. Disc brakes can be checked by observing the

thickness of the pads and the condition of the rotor.

The caliper can be removed by first removing the

wheel and tire to gain access. Then lightly pry the pads

away from the rotor and remove the caliper attaching

hardware. Then lift the caliper from the rotor and remove

the pads if necessary. Check the caliper for leaks and dam-

age. If necessary, check the pad thickness.

Push the piston into the bore with a C-clamp after

loosening the bleeder screw. Then install the new pads

with all hardware. Apply anti-squeal and high temperature

lubricant if necessary, then reinstall the caliper over the

rotor. Install and tighten the mounting hardware.

Common rotor problems include thickness variations,

warping, and heat damage. To remove the rotor, determine

what kind it is. Some rotors can be taken off the hub after

the caliper is removed, while others are removed by

removing the wheel bearing cotter pin and nut. The rotor

and hub can then be pulled from the spindle.

Rotors can be turned on or off of the vehicle.

Correctly mount the rotor in the arbor using the proper

adapters. Then adjust the cutters to take off needed mate-

rial. Make rough cuts to remove a great deal of metal, and

finish cuts to produce a smooth final surface. Hot spots can

be removed by grinding. Swirl grind to place a non-direc-

tional finish on the turned rotor.

After turning, install the rotor, add fluid to the reservoir

if necessary, and road test the vehicle. Check brake operation

and seat the brake pads, then return the vehicle to the owner.

Review Questions—Chapter 13

Please do not write in this text. Write your answers on

a separate sheet of paper.

1. Why should you use wire to hang the caliper to the

body, or place it where it will not hang?

2. Before pushing the piston into the caliper body on

some ABS vehicles, you should loosen the ______.

3. Anti-squeal compound, when used, should be

installed between the disc brake pads and the ______

mounting surfaces.

Chapter 13 Disc Brake Service 227

Figure 13-35.

One type of hand-held swirl grinder used to

produce a “non-directional” rotor finish. This unit is powered by

the lathe arbor, which turns a flexible drive shaft (not shown).

The grinder spins at approximately twice the speed of the lathe

arbor shaft. (Ammco)

Warning: Do not attempt to move the vehicle

until the brake pedal has been pumped

several times. If brake clearances are exces-

sive (common after the pads have been replaced),

the brake pedal will go to the floor without applying

the brakes.

Drive

head

Abrasive

discs 120 grit

Lathe arbor

attachment

coupling

Hand

grip

Spring

guard

Abrasive

disc

Flexible drive

cable housing

228 Auto Brakes

4. Before attempting to turn a rotor, visually check it for

______ and ______.

5. As a minimum, rotor thickness should be checked at

______ spots on the rotor.

6. Excessive rotor runout can be checked with a ______.

7. To remove a(n) ______ rotor from the vehicle, the

wheel bearings must be removed.

8. Place the following rotor turning steps in order.

___ (A) Set the feed speed.

___ (B) Install the rotor using the proper adapters.

___ (C) Clean the arbor.

___ (D) Set the rotor cutting depth.

___ (E) Install the silencer band.

___ (F) Start the lathe motor.

___ (G) Determine whether the rotor can be turned.

___ (H) Swirl grind the rotor.

___ (I) Inspect the turned rotor surface.

9. A motor driven grinder must be used to remove

______ from the rotor.

10. A non-directional finish is a series of fine ______

scratches.

ASE Certification-Type Questions

1. All of the following statements are true, EXCEPT:

(A) disc brake pad and rotor service is similar for

every kind of disc brake system.

(B) the most common disc brake problems are noise

and hard pedal.

squeals or squeaks.

(D) pulsation is usually caused by rotor problems.

2. Technician A says that observing pad thickness is a

good way to determine pad condition. Technician B

says that a grooved rotor is a sign of wheel bearing

wear. Who is right?

(A) A only.

(B) B only.

(D) Neither A nor B

3. Pushing the pads away from the rotor makes

_________ removal easier.

(A) pad

(B) caliper

(D) dust boot

4. Loaded calipers are new calipers with the ________

already installed.

(A) pads

(B) pins

(D) All of the above.

5. All of the following statements about pushing the

caliper piston into its bore are true, EXCEPT:

(A) before pushing on the piston, loosen the bleeder

screw.

(B) push on the piston with a large C-clamp.

fluid.

(D) tighten the bleeder only after the C-clamp is

removed.

6. Do not allow any anti-squeal compound or lubricant

to touch the _________.

(A) pad friction surfaces

(B) pad shoe

(D) Both A & C.

7. A rotor will not turn freely after the caliper is installed.

Technician A says to drive the vehicle and apply the

brakes a few times to loosen the rotor. Technician B

says to loosen the wheel bearings until the rotor turns

freely. Who is right?

(A) A only.

(B) B only.

(D) Neither A nor B.

8. To check a rotor for runout, use a ______.

(A) dial indicator

(B) brake micrometer

(D) Any of the above.

9. Technician A says that all bearing play should be

removed from an integral rotor before runout is

checked. Technician B says that a non-integral rotor

should be bolted to the hub before the runout is

checked. Who is right?

(A) A only.

(B) B only.

(D) Neither A nor B

10. A brake lathe can be used to remove ______ from the

rotor.

(A) scoring

(B) bluing

(D) All of the above.

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