BMW 3 of the E46 series

since 1998 release

Repair and operation of the car



BMW 3 of the E46 series
+ BMW 3 Cars (E46)
+ Current leaving and service
+ Engine
+ Cooling systems, heating
+ Power supply systems, injection and release
+ Electric equipment of the engine
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
- Brake system
   Removal and installation of brake shoes of forward wheels
   Removal and installation directing a forward brake
   Removal and installation of a brake disk of a forward wheel
   Removal and installation of brake shoes of disk brakes
   Removal and installation of a bracket of a brake of back wheels
   Removal and installation of a brake disk of a back wheel
   Measurement of thickness of a brake disk
   Brake fluid - the main data and security measures
   Removal of air from brake system
   Replacement of the brake pipeline
   Replacement of a forward brake hose
   Check of the amplifier of a brake
   Removal and installation of blocks 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 drive of the parking brake
   Removal and installation of the switch of a stoplight
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment





Removal and installation of brake shoes of disk brakes

Support of a back disk brake

1 — a support
2 — directing brakes
3 — a spring lock
4 — a bolt, 65 N • m
5 — the union of removal of air
6 — a dustproof cap

7 — the directing finger
8 — a protective stopper
9 — the wear sensor
10 — a sealing set of a support
11 — a repair kit of the directing plug
12 — the brake shoes (which are not containing asbestos)


 REMOVAL

1 Mark paint the provision of back wheels concerning a nave. It will allow to establish at assembly the balanced wheels in their former situation. Weaken bolts of fastening of a wheel at the car standing on the earth. Lift back part of the car, put it on supports and remove back wheels.

If brake shoes are applied again, at removal they need to be marked. It is not allowed to interchange the position of a block of the right and left wheel. It can lead to uneven braking. It is necessary to apply only the blocks of BMW firm or a block resolved by BMW firm. Surely replace all blocks of disk brakes of forward wheels at the same time even if limit of wear reached one of blocks.


2 Rasstykuyte at the right support a wear sensor cable (the shooter on an illustration), thus do not pull for a cable.

3 Remove plastic caps-1-and turn out the screws located under them with an internal hexagon. 2 screws of fastening directing brakes.

4 Remove a screw-driver a bracket-3-.

5 Remove a support back.

6 Remove an external brake shoe.

7 Internal brake shoe is fixed in the piston by a spring-6-.


 INSTALLATION

After removal of brake shoes do not press a brake pedal. Otherwise the piston can be squeezed out from the case.

8 If at the sensor of wear isolation of a contact plate is wiped, isolation of a cable is damaged or the plastic element is worn-out, the sensor should be replaced.

9 Clear a brush from light metal or wipe the rag moistened in alcohol, the directing surface and a seat for brake shoes. Do not apply for this purpose the solvents containing mineral oils, or the tool with sharp edges. If blocks are applied again, they need to be cleared also.

10 Before installation of brake shoes it is necessary to check fingers of a hand existence of zadir on a brake disk. In the presence of zadir disks need to be replaced.
11 Measure thickness of brake disks, address to the Section Measurement of Thickness of a Brake Disk.

12 Check a dustproof cap-2-for existence of cracks. In the presence of damages the cap needs to be replaced immediately as the got pollution quickly lead to loss of tightness of a support. For this purpose it is necessary to remove a support and to sort (work HUNDRED).

13 Press the piston by means of the corresponding adaptation. It can be made whetstone of solid wood (the hammer handle). Thus pay special attention to that the piston did not warp also a piston surface, and also a dustproof cap were not damaged.

At cave-in of pistons from brake cylinders in the tank of brake fluid level rises. Watch level, if necessary suck away liquid.

It is necessary to apply a special or plastic bottle which is intended only for this purpose to suction of brake fluid! Do not apply for this purpose bottles to drinking water! Brake fluid is poisonous and it cannot be sucked away a mouth through a hose by no means. Use for this purpose the special device. After replacement of brake shoes liquid level in the tank should not be higher than a mark the MOVE as when heating liquid extends. The following brake fluid flows down the main brake cylinder, damages a paint and varnish covering and leads to corrosion.

At big wear of brake shoes it is necessary to check ease of a piston stroke. For this purpose insert wooden whetstone into a support and ask the assistant to press a brake pedal slowly. The brake piston has to enter and leave easily. For carrying out check all other supports have to be inserted on the places. Watch that the piston completely did not leave. If the piston stroke heavy, a support is subject to repair (work HUNDRED).

Cover adjacent surfaces of a support with paste against squeal of brakes.

For an exception of squeal of disk brakes in use "Never Seez Compound" need to cover some places of a support with a thin layer of special paste, for example.

Paste should not get on dustproof cuffs, surfaces of friction of brake shoes or a brake disk at all. If necessary at once wipe paste alcohol, replace a dustproof cuff with the new. Do not cover the Podkladny plate of a brake shoe with paste.

14 Grease with a thin layer of paste against squeal an adjacent surface of the brake piston to a brake shoe.

15 Clear adjacent surfaces of-1-and-2-T-shaped heads of a brake shoe at a support and cover with a thin layer of paste against squeal of brakes.

16 Clear an adjacent surface-3 supports and cover with a thin layer of paste against squeal of brakes in the places shaded on an illustration.

17 Clear a bracket at the directing T-shaped heads (an arrow on an illustration) and apply a thin film of paste against squeal of brakes in the places shaded on an illustration.

18 Insert a brake head with a spring into the piston.

19 Insert into a support an external block-9-and put a support on the directing. Watch that blocks were cleared.

20 Check visually two bolts of fastening of a support, if necessary clear a bracket of pollution. If it is necessary, pass a carving in a bracket a tap. The bolts having a rust or damages of a carving, replace. Fix bolts a-7-face key of-8-by 7 mm the moment of 30 N • m.

Only clear bolts, it is not necessary to grease them.

21 Put into place protective caps of bolts of fastening.
22 Join the wear sensor socket on the right side of the car. The wire has to pass in an union cover loop for removal of air.

23 Establish a lock spring of a support.

24 Establish back wheels and screw fastening bolts. Do not grease bolts. Establish wheels so that the markings put at removal coincided. Lower the car on wheels and tighten bolts the moment of 100 N • m.

Several times strongly press a brake pedal in a standing position so that resistance was felt. Thus, brake shoes will reach the working position.

25 Check liquid level in the tank. If necessary add to MAX mark.

— 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.

26 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.

After installation of their new brake shoes it is necessary to earn extra. During the movement the first 200 km it is necessary to avoid strong unnecessary braking.

Brake disks in some regions have to be utilized as special swore. Local authorities inform drivers on places of possible utilization.