BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car



BMW E39
+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
- Brake system
   Anti-blocking system
   Removal and installation of front brake shoes
   Removal and installation of a brake disk / support of a forward brake
   Removal and installation of back brake shoes
   Removal and installation of back brake supports
   Removal and installation of a brake disk of back wheels
   Measurement of thickness of a brake disk
   Brake fluid
   Removal of air from the brake system
   Replacement of brake pipelines
   Replacement of a forward brake hose
   Check of the vacuum amplifier of a brake
   Removal and installation of brake shoes of the parking brake
   Adjustment of the parking brake
   Removal and installation of the lever of the parking brake
   Removal and installation of a cable of the parking brake
   Check and replacement of the switch of a stoplight
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics





Removal and installation of back brake shoes

 REMOVAL

1. Mark with paint the provision of a wheel concerning a nave. Thanks to it the balanced wheel can be established in former situation. Weaken bolts of fastening of a wheel on the car standing on the earth. Lift and install the car on supports and remove a wheel.

If brake shoes are applied again, at removal they need to be marked. Shift of blocks by places is not allowed. It can lead to uneven braking. It is necessary to establish only original blocks of BMW or resolved by firm. Surely replace all back blocks at the same time even if one of them did not reach a wear limit yet.

2. Rasstykuyte fingers shtekerny connection of the sensor of wear of blocks on the right support (an arrow on an accompanying illustration). Do not pull at the same time for a cable.

3. Remove both plastic caps (1) of screws of fastening and turn out a face key two screws.

4. Remove the screw-driver a bracket (3).

5. Remove a support back.

6. Remove external blocks.

7. The internal block is fixed by a spring (6) in the brake piston. Take out a block.

Installation

At the removed brake shoes do not press a brake pedal, otherwise the piston can be squeezed out from the case.


 INSTALLATION

1. Check the sensor of wear of a brake shoe. If isolation of a contact plate is wiped, isolation of a cable is damaged or the plastic element is erased, replace the sensor.

2. Clear a brush from soft metal or wipe with the rag moistened in alcohol the directing surface of a brake shoe in a case aperture. Do not apply for this purpose the solvents containing mineral oils or the tool with sharp edges. If blocks are applied again, clear as well them.

3. Before installation of blocks check a brake disk for existence of zadir, having felt it fingers. In the presence of zadir the disk needs to be replaced. Clear the brake disk having gray or blue color before installation of new brake shoes.
4. Measure disk thickness, address the Section Measurement of Thickness of a Brake Disk.

5. Check a protective cap (2) on the piston. In the presence of damages replace since penetration of dirt into the cylinder can lead to an exit to loss of tightness of a support. A support for this purpose it is necessary to remove and sort (work HUNDRED).

6. Press on the piston special adaptation. For this purpose it is possible to use also wooden whetstone (for example, the hammer handle). At the same time pay special attention to that the piston did not warp, and also on to damaging a protective cap.

By pressing the piston brake fluid from the cylinder is squeezed out in the tank. You watch it and if necessary suck away liquid.

7. The plastic bottle is applied to a suction of liquid. Do not apply for this purpose a bottle to drinking liquid. Brake fluid is poisonous. It is impossible to suck away it a mouth through a hose at all. After replacement of brake shoes do not assume that the level of brake fluid in the tank exceeded the mark "Max" since when heating liquid extends. The liquid acting from system flows down on the main brake cylinder, damaging a paint and varnish covering and leading to corrosion.

At big wear of brake shoes check ease of a piston stroke. For this purpose insert wooden whetstone into a support and ask the assistant to press a brake pedal. The piston has to move forward and be pressed easily. You watch to squeezing out completely the piston. If the piston moves hard the support demands repair.

8. For an exception of a gnash of disk brakes grease with special paste the details provided below. As such paste it is possible to apply the following: Plastilube, Tunap VC 582/S, Chevron SRJ/2, Liqui Moly LM-36 or LM-508-ASC.
   a) A piston prileganiye surface to a brake shoe.

   b) Clear a prileganiye surface (3) supports and grease the places shaded on an accompanying illustration with a thin layer of paste.

   c) Clear a bracket at guides and grease with a thin layer of special paste in the places shaded on an accompanying illustration.

Paste should not get on a protective cap, a brake shoe or on a brake disk at all. If paste got on the specified surfaces, at once wipe it with alcohol or replace a protective cap.

Do not grease a back plate of a brake shoe.

9. Insert a brake shoe with a spring into the piston.

10. Insert an external brake shoe (9) into a support and install a support on a brake drive. You watch that brake shoes were pure.

11. Check external survey two bolts of fastening of a support. If necessary clear a carving of dirt, and pass a carving in a support a tap. Replace bolts with the damaged carving or traces of a rust. Tighten bolts a face key of 7 mm the moment of 30 Nanometers.

Only clear bolts, do not grease them.

12. Put on caps bolts.

13. Join shtekerny connection of sensors of wear on the left side of the car. The wire has to pass in an air pumping union cap loop.

14. Put on a bracket a support.
15. Establish and fix forward wheels. Do not oil fastening bolts. Establish wheels so that the markings put at removal coincided. Lower the car on wheels, tighten fastening bolts cross-wise the moment of 100 Nanometers.

Several times strongly press a brake pedal so that resistance was felt. At the same time brake shoes will nestle on a disk and will reach the working position.

16. Check the level of brake fluid in the tank. If necessary add it to the mark MAX.
Attention, check reliability:
   a) Whether brake hoses are fixed?
   b) Whether the brake hose is fixed in the holder?
   c) Whether the union of removal of air is tightened?
   d) Whether enough brake fluid in the tank?
   e) On the working engine check tightness of system. For this purpose press a brake pedal by effort 200 - 300 N (20 - 30 kg) and you hold it during 10 pages. The effort of pressure of a pedal of a brake to a leg should not weaken.
   f) Check all connections for tightness.

24 New brake shoes have to be earned extra. For this purpose several times slow down the car from the speed of 80 km/h to the speed of 40 km/h weak pressing a pedal. Between separate pressing let's a brake be cooled.


The first 200 km of a run it is not necessary to stop the car strongly.


Brake shoes should be utilized in a special way. Do not utilize them together with household waste.