Audi A3

Since 1997 of release

Repair and car operation



Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
- Brake system
   Replacement of lobbies brake колодок
   Removal and installation of disk brake mechanisms of back wheels
   Check of a thickness of a brake disk
   Removal and installation of a brake disk/support
   Adjustment of a lay brake
   Brake liquid
   Removal of air from brake system
   Removal and installation of a brake hose
   Check of the amplifier of a brake
   Removal, installation and adjustment of the switch of a stoplight
   Removal and installation of the lever and cable of a lay brake
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes



Removal and installation of a brake disk/support

THE GENERAL DATA

The brake disks having corrosion, create effect of vibration which does not disappear at longer braking at braking. In this case it is necessary to replace brake disks.

REMOVAL

PERFORMANCE ORDER
1. Mark a paint position of wheels concerning a nave. It will allow to establish at assemblage отбалансированное a wheel in its former position. Loosen the bolts of fastening of a wheel on the car standing on the earth. Lift the car and establish it on supports. Remove wheels.
2. A forward brake with a support FN - 3: Turn out 2 bolts of fastening (are specified by arrows) and remove a support with directing with a brake disk. The support FN - 3, is resulted on an illustration the Disk brake mechanism of back wheels in subsection Removal and installation of disk brake mechanisms of back wheels.
3. A forward brake with a support FN - III: Remove brake Pads, thus address to subsection Replacement of lobbies brake колодок.
4. Brakes of back wheels: Turn out 2 bolts of fastening of a support at a beam of an axis and remove a support from a brake disk, thus address to an illustration the Disk brake mechanism of back wheels in subsection Removal and installation of disk brake mechanisms of back wheels.
5. Fix a support on a hook from a wire on a suspension bracket so that the brake hose has not been tense.
ATTENTION

Brake hose do not disconnect, otherwise after installation it is necessary to delete air from brake system.


6. If the support has to act in film completely:

– At a forward support turn away the brake pipeline at муфты.
– At a back support at first turn away the brake pipeline at a junction with a hose. Then, if it is necessary, turn away a hose at a support. In addition disconnect a cable of a lay brake.
ATTENTION

At opening of a brake contour the brake liquid follows. The liquid is necessary for collecting in the capacity intended specially for this purpose. It is possible to extort also a liquid preliminary from the tank.


7. Turn out the screw with crosswise шлицом fastenings of brake disks.
8. Remove a brake disk.
ATTENTION

It is impossible to remove a brake disk from a nave with force application (blows by a hammer). It is necessary to use for this purpose means for rust dissolution. If disk removal probably only with application of blows of a hammer, for safety reasons is necessary to replace brake disks and bearings of wheels. Replacement of bearings should be made in conditions HUNDRED as only there, as a rule, there can be available corresponding press. After stripper application also it is necessary to replace brake disks.


INSTALLATION

For reception of uniform braking from both parties both brake disks should have an identical surface concerning a roughness. Therefore it is necessarily necessary to replace both brake disks. In conditions HUNDRED it is possible to check up a disk on palpation. The maximum palpation of a surface of a disk: 0.05 mm; the maximum admissible difference in a thickness of disks: 0.01 mm.

PERFORMANCE ORDER
1. Measure a thickness of a brake disk, thus address to corresponding Section.
2. If is available, remove a rust on a flange of a brake disk and a nave.
3. Clear a new disk a thinner of a protective varnish.
4. Establish new brake disks on a nave and fix screws with a crosswise head.
5. Brakes of forward wheels with a support FS - III: Establish brake Pads, thus address to subsection Replacement of lobbies brake колодок.
6. Brakes of forward wheels with a support FS - 3: Establish a support with brake колодками. Thus watch that has not been overwound or will pull a brake hose. Fix a support the moment 125 Н•м.
ATTENTION

If old ridge bolts again are applied, clear preliminary edges a brush.


7. Brakes of back wheels: fix the moment 65 Н•м. Connect a cable of a lay brake.
ATTENTION

If the brake hose acted in film, establish it and remove air from brake system, thus address to subsection Removal of air from brake system.


8. Establish wheels so that the marks put at removal have coincided. Preliminary grease with a thin layer подшипниковой greasings aligning corbel of a wheel disk on a nave. Wrap bolts of fastening of wheels. Lower the car on wheels and tighten bolts a cross - crosswise the moment 120 Н•м.
ATTENTION

Some times strongly press a brake pedal so that distinct resistance of a pedal was felt. Thus Pads will lie down to a brake disk and will take the place.


9. Check up level of a brake liquid in the tank. If necessary add.
10. Brakes of back wheels: Adjust a lay brake, thus address to subsection Adjustment of a lay brake.
ATTENTION

Inspect reliability:

– Whether fastenings of brake hoses are reliably tightened?
– Whether the brake hose in the holder is fixed?
– Whether unions of removal of air are tightened?
– Whether it is enough in the tank of a brake liquid?
– At the working engine check up tightness of system. For this purpose press a pedal of a brake effort 200 – 300 Н (20 – 30 kg) during 10 with. The pedal should not depart. Check up on tightness all connections


11. Cautiously allow to be earned extra new brake колодкам. For this purpose some times brake the car since speed 80 to 40 km/hour slightly pressing a pedal. Between braking allow to be cooled to a brake.
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