A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
- Brakes
Independent work on brake system
So the brake system works
Check of brakes
Brake fluid
Check of level of brake fluid
Check of brake system on tightness and existence of damages
Replacement of brake fluid
Disk brakes
Measurement of thickness of overlays of forward disk brakes
Check of a condition of brake disks
Replacement of overlays of disk brakes
Back disk brakes
Measurement of overlays of back disk brakes
Emergency brake
Check of idling of the lever of the emergency brake
Main brake cylinder
Brake amplifier
Check of the brake amplifier
Works on hydraulics of brake system
Pumping of brake system
The help at malfunctions
ABS and EDS
What does ABS?
Function of separate knots
Electronic system of distribution of brake effort (EBV)
Violations in work of ABS system
Electronic blocking of differential (EDS)
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics
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Replacement of overlays of disk brakes
Always it is necessary to change at the same time both slips at the left and on the right. Use slips only with AVA (General permission to operation). If the manufacturer of a brake is Lucas, when replacing slips are used two new samokontryashchikhsya a bolt. They most often are in a set of brake slips – check. If the manufacturer of a brake is ATE, bolts are not necessary.
As in process of wear of slips pistons all farther leave in brake supports, at installation of new, thick slips they need to be wrung out back. Thus brake fluid is wrung out via pipelines in a broad tank. If in this period brake fluid was in vain added, surplus needs to be sucked away now. Otherwise the brake fluid acting from a broad tank will corrode the nearby varnished details in a motive compartment. For suction use absolutely pure pipette or an old syringe for injections – never suck away liquid a mouth!
Replacement of a slip in ATE brakes
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ATE brake: dismantle of slips, first stage: wring out a screw-driver (2) fixing spring (1). |
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ATE brake: dismantle of slips, second stage: weaken bolts with internal hexagons in protective covers (1 and 2) after removal of caps. |
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Third stage: the external slip (3) in the case of a brake support of ATE (2) is pasted, the internal slip (1) is inserted with metal brackets (shooter) into an internal opening of the brake piston. |
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The piston in a brake support is wrung out by a clamp. For protection we laid between them a small plate. The brake support of Lucas established here usually remains fixed above. |
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- Lift and record forward part of the car.
- Remove a wheel.
- Turn a wheel in order that slips were well available.
- Remove a screw-driver fixing springs from outer side on a brake support.
- Remove caps on inside of brakes.
- Establish a key with an internal hexagon in already visible internal hexagon of the directing fingers and weaken both fingers.
- Take out fingers, remove the case of a brake support.
- Suspend the case of a brake support on a wire on a depreciation rack.
- Take out slips on the right and at the left from the case of a brake support: an internal slip have to be taken out with fixing brackets from the brake piston, the external slip has to be unstuck from a brake support, – if it is necessary, with a force.
- Wring out pistons in a brake support by means of a clamp. In order that the piston did not warp or was not damaged, on an adjacent ring put a small plate.
- Carefully remove the remains of the gluing film on an adjacent surface of an external slip.
- Clean a brake support, the rust should not be, first of all, on directing.
- Insert new slips to paste an external support, remove a protective film from the gluing site.
- Establish a brake support.
- Tighten the directing fingers on 25 Nanometers and again put on caps.
- After assembly surely several times press a brake pedal so that slips lay down to brake disks. Otherwise there will be no brake effect!
- With new slips – if it is possible – brake carefully the first 500 km.
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Replacement of slips in Lucas brakes
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Lucas brake: unscrew only the lower fixing bolt (2) cases of a brake support. Wring out the directing finger to the opposite side. The top fastening (1) remains untouched. |
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Lucas brake: the case of a support (2) after weakening of the lower fastening leans back up. Slips (3 and 4) in the directing. Further it is visible: 1 – a heat-shielding guard in the brake piston. |
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- Lift and record forward part of the car.
- Remove a wheel.
- Turn a wheel in order that slips were well available.
- Unscrew only the lower fixing bolt of the case of a brake support, thus wring out the directing finger for a hexagon in an opposite direction.
- Cast away the case of a brake support up.
- Take out slips on the right and at the left from the directing.
- Wring out a clamp the piston in a brake support. In order that the piston did not warp or was not damaged, on an adjacent ring put a small plate.
- Track the correct position of the heat-shielding screen in the brake piston.
- Insert new slips.
- Mount a brake support.
- Tighten a new (!) lower fixing bolt on 30 Nanometers. Do not tighten the top fixing bolt, otherwise will disappear samokontryashchiysya effect. Use a narrow rozhkovy key for an extraction in an opposite direction of the directing finger, differently will jam it and the moment of an inhaling will be distorted.
- After assembly surely several times press a brake pedal so that slips lay down to brake disks. Otherwise there will be no brake effect!
- With new slips – if it is possible – brake carefully the first 500 km.
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Dismantle of a forward brake support
Forward brake supports are attached to a depreciation rack by so-called ridge bolts. These bolts behind a six-sided head have a corrugated surface which is not allowing inadvertent weakening of a bolt. These bolts cannot be replaced with |