Audi A4, S4

since 2000 release

Repair and operation of the car

Removal and installation of a brake disk / support

Rusty brake disks when braking are the reason of emergence of jolting which does not disappear and at long braking. In this case brake disks need to be replaced.

Removal

PERFORMANCE ORDER

Mark with an arrow the direction of rotation of the tire. Turn off bolts of fastening of a wheel. Lift and install the car on supports. Process of removal of supports of different models can have differences. Always bolts of fastening of the corresponding support need to be replaced on new since they are self-stopped. Besides, it is necessary to pay attention that bolts of fastening of the corresponding brake disk have the determined tightening moment. Back brake: Disconnect a cable of the parking brake from a support, address to the Section Removal and installation of blocks of brake mechanisms of back wheels. Generally the support can be removed without removal of brake shoes. Turn out bolts of fastening of a support and tie a wire a support to a suspension bracket. Do not disconnect a brake hose, otherwise after installation air should be deleted from brake system with use of the special device. If the support needs to be removed completely: At a forward support disconnect the brake pipeline in a junction with a hose; At a back support disconnect at first the brake pipeline from a brake hose and then if it is necessary, disconnect a hose at a support. When opening brake system brake fluid follows. Substitute the bottle intended only for brake fluid under the following liquid. It is also possible to suck away previously liquid a siphon from the tank. Remove a brake disk. If the brake disk is supposed to be used further, do not remove it from a nave with use of force (blows of a hammer). For this purpose use rust solvent.

Installation

For achievement of uniform braking from both parties it is necessary to have brake disks with identical quality of a surface. Therefore it is necessary to replace both brake disks of one axis or to pierce them on one size.

HUNDRED can check disks for a face beating. The maximum beating should not exceed 0.05 mm, and the maximum difference in thickness of a disk should not be more than 0.01 mm.

PERFORMANCE ORDER

Measure thickness of a brake disk, address to appropriate section. If on a flange of a brake disk and a nave of a wheel there is a rust, it needs to be removed. Clear a thinner a surface of a new brake disk of a sheeting. Establish into place a support. Depending on the instruction apply the new self-stopped bolts. Watch that the brake hose was not twisted. Observe the established value of the moment of a tightening of the corresponding support, address to Specifications. Back brake: Connect a cable of the parking brake to a support and adjust the parking brake, address to the Section Adjustment of the Parking Brake. If the brake hose was removed, fix it and remove air from system by means of the special device (work HUNDRED). Observing the direction of rotation, establish a wheel. Lower the car on wheels, and only after that tighten fastening bolts cross-wise the moment 120nm. Several times standing press a brake pedal so that to feel resistance. Check liquid level in the tank, if necessary, add liquid.

Attention, carry out reliability control:

- Whether brake hoses are fixed?

- Whether the brake hose is fixed in the holder?

- Whether unions for removal of air are tightened?

- Whether enough brake fluid is filled in?

- On the working engine check tightness. For this purpose press a brake pedal by effort of 200 - 300 N (20 – 30 kg) during 10 pages. The pedal should not weaken. Check all accessions for tightness.

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