BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

+ 1. The maintenance instruction
+ 2. Maintenance service
+ 3. The engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. An exhaust system
+ 8. Transmissions
+ 9. Coupling
- 10. Brake system
   10.2. Specifications
   10.3. Antiblocking system (ABS)
   10.4. Колодки disk brakes
   10.5. A support of a disk brake
   10.6. A brake disk
   10.7. Колодки drum-type brakes
   10.8. The main cylinder of brakes
   10.9. The vacuum amplifier of brakes
   10.10. A cable () a manual brake
   10.11. Adjustment of a manual brake
   10.12. The mechanism of a manual brake
   10.13. A brake pedal
   10.14. The switch of a signal of braking
   10.15. Hoses and lines of a hydrodrive of brakes
   10.16. Removal of air from a hydrodrive of brakes
+ 11. A running gear
+ 12. A body
+ 13. An electric equipment
+ 14. A good advice

10.6. A brake disk

The prevention

Disks of brakes (forward or back) should vary or be ground in steam.


1. Release bolts of fastening of wheels, lift the car and establish on supports, remove a wheel and wrap three bolts in a disk. At work with a back brake disk include a manual brake.
2. Remove a support, take aside and fix, without disconnecting a hose. Turn away bolts (arrows) and remove a support arm.
3. Check up a disk surface on presence of cracks, deterioration and other damages. Presence of superficial damages and easy scratches is supposed. In the presence of deep задиров, it is necessary to replace a disk, or прошлифовать. If on a disk there are cracks replace it.
4. Check up both parties of a disk. If at inclusion of brakes strong vibration, that, probably is found out, the disk is jarred on (disk palpation is very great). On cars with ABS-system the vibration caused короблением, it is possible to accept for normal work of ABS-system (by pressing a brake pedal almost same vibration is felt, as at a faulty disk).
5. Check up disk palpation, having established an indicator leg in 13 mm from edge of a disk and rotating a disk. If palpation exceeds norm replace a disk or прошлифуйте.
6. The disk is recommended to be ground in any case, at least to remove roughnesses a small emery paper.
7. Disk polishing if its thickness becomes less limiting is not supposed. The limiting thickness of a disk is stamped on a part of a disk which fastens to a nave.

The admissible sizes and palpation of a disk (mm)

Admissible thickness of a disk after polishing
Maximum permissible thickness of a disk
Admissible non-uniformity of a disk on a thickness
Admissible axial palpation:
  – The disk is removed
  – The disk is established


1. Turn away the screw and remove a disk from a nave.
2. If the disk does not give in to removal drip a getting liquid between a disk and a nave and after some minutes remove a disk.
3. If the back disk does not give in to removal reduce колодки, having turned a thin screw-driver a regulator cogwheel.


1. Carefully clear a disk, having removed traces of a getting liquid. Establish a disk on a nave and tighten the screw.
2. Establish a support arm (if it is removed), brake колодки and a support. Tighten bolts and screws of all connections with the set moments.
3. Establish a wheel, lower the car. Press some times a brake pedal.
4. If necessary adjust колодки a manual brake (subsection 10.12 see).
5. Before departure check up work of brakes.