Audi A3

since 1997 of release

Repair and car operation



Audi A3
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Systems of cooling, heating
+ the Power supply system and production of the fulfilled gases
+ engine Electric equipment
+ Manual box of gear shifting
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
- Brake system
   Replacement of forward brake shoes
   Removal and installation of disk brake mechanisms of back wheels
   Check of thickness of a brake disk
   Removal and installation of a brake disk/support
   Adjustment of the parking brake
   Brake liquid
   Air removal 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 the parking brake
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Elektroskhema







Removal and installation of a brake disk/support

GENERAL INFORMATION

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

REMOVAL

PERFORMANCE ORDER
1. Mark paint the provision of wheels concerning a nave. It will allow to establish at assembly an otbalansirovanny wheel in its former situation. Weaken 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 FN-3 support: Turn out 2 bolts of fastening (are specified by shooters) and remove a support with directing from a brake disk. FN-3 support, is given in an illustration the Disk brake mechanism of back wheels in the subsection Removal and installation of disk brake mechanisms of back wheels.
3. A forward brake with FN-III support: Remove brake shoes, thus address to subsection Replacement of forward brake shoes.
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 the 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 was not 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 unscrew the brake pipeline at the coupling.
– At a back support at first unscrew the brake pipeline at a junction with a hose. Then, if it is necessary, unscrew a hose at a support. In addition disconnect a cable of the parking brake.
ATTENTION

When opening a brake contour brake liquid follows. Liquid is necessary for collecting in the capacity intended specially for this purpose. It is possible to extort also liquid previously from the tank.


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

It is impossible to remove a brake disk from a nave with use of force (blows a hammer). It is necessary to use for this purpose means for rust dissolution. If removal of a disk possibly 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 the corresponding press. After application of a stripper it is also necessary to replace brake disks.


INSTALLATION

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

PERFORMANCE ORDER
1. Measure thickness of a brake disk, thus address to appropriate 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 FS-III support: Establish brake shoes, thus address to subsection Replacement of forward brake shoes.
6. Brakes of forward wheels with FS-3 support: Establish a support with brake shoes. Thus watch that it was not overwound or will pull a brake hose. Fix a support the moment of 125 N • m.
ATTENTION

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


7. Brakes of back wheels: fix the moment of 65 N • m. Connect a cable of the parking brake.
ATTENTION

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


8. Establish wheels so that the markings put at removal coincided. Previously grease with a thin layer of bearing greasing aligning corbel of a rim on a nave. Wrap bolts of fastening of wheels. Lower the car on wheels and tighten bolts a cross – crosswise the moment of 120 N • m.
ATTENTION

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


9. Check level of brake liquid in the tank. If necessary add.
10. Brakes of back wheels: Adjust the parking brake, thus address to subsection Adjustment of the parking 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 brake liquid?
– At the working engine check tightness of system. For this purpose press a brake pedal effort of 200-300 N (20-30 kg) during 10 pages. The pedal should not depart. Check on tightness all connections


11. Carefully let's be earned extra to new brake shoes. For this purpose several times brake the car since speed 80 to 40 km/h slightly pressing a pedal. Between braking let's be cooled to a brake.