BMW 7_ая the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and operation receptions
3. Settings and routine maintenance of the car
3.1. General information
3.2. General information about settings and adjustments
3.3. Schedule of routine maintenance
3.4. Check of levels of liquids, control of leaks
3.5. Check of a condition and replacement of hoses and tubes in an impellent compartment, localization of leaks
3.6. Replacement of impellent oil and oil filter
3.7. Pro-cleaning and replacement of the fuel filter
3.8. Check of brake system and coupling
3.9. Check of a condition of system of production of the fulfilled gases
3.10. Check of a condition of components of a suspension bracket and steering
3.11. Check of a condition of protective covers of CV JOINTS of power shafts
3.12. AT transmission oil replacement
3.13. Replacement of brake liquid and pumping of brake system
3.14. Replacement of spark plugs
3.15. Replacement of the salonny filter (ventilation system)
3.16. Replacement of a filtering element of an air purifier
3.17. Replacement of cooling liquid
3.18. Check of a condition of tires and pressure of their rating
3.19. Check of a condition of the battery and care of it
3.20. Check of a condition of a belt of a drive of auxiliary units
3.21. Check of a condition of brushes of screen wipers and adjustment of nozzles of washers
3.22. Replacement of oil of the main transfer
3.23. Check of thickness of a conducted disk of coupling
4. Engine
5. Systems of cooling of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Kardanny and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Electric equipment schemes


3-8-proverka-tormoznojj-sistemy-i-scepleniya.html

3.8. Check of brake system and coupling

The dust being formed as a result of wear of slips and accumulating on components of the brake mechanism, can contain asbestos hazardous to health. Do not blow this dust by means of the compressed air and do not inhale it! Do not use for dust removal solvents on the basis of gasoline.

Except checks through the established intervals of time a condition of brake mechanisms it is necessary to carry out each time at removal of wheels or at emergence of signs of malfunction in brake system. Check of level of brake liquid is described in the Section Check of levels of liquids, control of leaks.

Signs of malfunctions in brake system

Any of listed below signs can point to potential defect of brake system:

  1. When squeezing a pedal of a brake during movement the car "withdraws" in one party;
  2. Brake mechanisms when braking publish scraping or squealing sounds;
  3. The pedal of a brake has an excessive course;
  4. The pedal of a brake pulses (it normally only at ABS system work);
  5. Leakages of brake liquid (usually appreciable tires on inside or wheels) are observed

In case of detection at least one of these signs immediately examine brake system.

Brake lines and hoses

In brake system metal brake tubes, except for the flexible reinforced hoses at wheels are generally used. Regular survey of all these lines is very important.


 PERFORMANCE ORDER

  1. Park the car on an equal platform.
  2. To Poddomkratta the car also establish it on props then remove wheels. Check of vacuum hoses is described in the Section Check of a condition and replacement of hoses and tubes in an impellent compartment, localization of leaks.
  3. Check all brake lines and hoses on existence of cracks and attritions in their external covering, and also leaks, swellings and deformations. Check brake hoses in forward and back parts of the car on existence of signs of a softening, cracks, deformations or wear as a result of a friction about other details. Check all shtutserny connections on existence of signs of leaks and make sure of reliability of all fixture of brake lines.
  4. Bend hands in one and other parties a brake hose to reveal damages. To braid hoses does not follow.
  5. Turn a steering wheel to the right and to the left against the stop. Make sure that hoses thus do not touch elements of a design of the car.
  6. At detection of leakages of liquid from brake lines or their damages of leak it is necessary to eliminate immediately. For more detailed description of procedure of repair of brake system address to Head Brake system.

Check of thickness of brake shoes and disks

Disk brake mechanisms

 PERFORMANCE ORDER

  1. To Poddomkratta the car also establish it on props then remove the corresponding wheel.

Experience shows that owing to availability of dirt on the brink of the road wear of brake shoes of the right wheel more than left. Therefore for check it is meaningful to remove a forward right wheel.

  1. Measurement of thickness of a block of a disk brake is made through a special control window in a support. If the thickness of a frictional overlay of a block makes less than 3 mm, replace all blocks of both brake mechanisms of wheels of this axis (see. Head Brake system).

As a rule, 1 mm of wear of an overlay of a brake shoe corresponds, at least, 1000 km of run under adverse service conditions. In usual conditions of a slip are erased much more slowly.

  1. Check supports of brake mechanisms on existence of leaks. At detection of leaks urgently repair a support.
  2. Visually check brake disks from internal and outer side on existence of furrows, a rust and cracks. Defective components replace.
  3. Measure thickness of brake disks in several places by means of a micrometer or a special calliper. It is possible to measure also thickness of a brake disk by a usual calliper, having enclosed from each its party a lining of known size (for example, two coins), and then having subtracted from the measured value thickness of linings.
  4. Compare minimum of the received results to requirements of Specifications to Head Brake system. If the limit of wear is reached, replace surely both brake disks. Also it is necessary to replace a brake disk and at big cracks or deep furrows on a working surface.

Boots of the parking brake

 PERFORMANCE ORDER

  1. Using instructions of Head Brake system, remove back brake disks.
  2. Measure thickness of frictional slips on boots of back brake mechanisms and examine them on existence of signs of pollution by brake liquid or greasing. If the slip has thickness within 1.5 mm over heads of rivets or the metal basis in the thinnest place, replace all boots. Boots are subject to replacement also burst, zapolirovanny to shine and polluted by brake liquid or greasing. Procedure of replacement is described in Head Brake system.
  3. Check a condition of coupling and holding springs of boots, and also the adjusting mechanism. Make sure that all these components are correctly established and are in working condition. The worn-out or deformed springs can serve as the reason of premature wear of frictional slips.
  4. Check wheel cylinders on existence of signs of leaks, having accurately removed protective rubber covers. Existence of insignificant traces of moisture under covers is allowed. If under them brake liquid is found or it follows from the wheel cylinder, it is necessary to repair or replace cylinders capitally (address to Head Brake system).
  5. Check drums on existence of deep scratches, furrows, cracks and peregrety sites which look as the decoloured spots. If the revealed defects cannot be eliminated by means of an emery paper, the drum should be pierced in a workshop.
  6. Following indications of Head Brake system, establish brake disks.
  7. Establish wheels. If check of the parking brake is required, do not lower the car on the earth.

Check of reliability and course of the lever of the parking brake

 PERFORMANCE ORDER

  1. The simplest way of check of operation of the parking brake is car installation on an abrupt slope with the cocked brake and transmission in neutral situation (at check it is necessary to be in the car). If the parking brake does not hold the car from a skatyvaniye, it is necessary to make its adjustment (see. Head Brake system).
  2. To Poddomkratta a car back also establish it on supports.

Previously it is recommended to cock carefully for speed of 40 km/h the parking brake to feeling of easy braking. Then, supporting the specified speed, cock the lever on one click and be passed about 400 m. After that release the parking brake and let's to it cool down.

  1. Tighten the parking brake on 5 teeth. Turn wheels by hand – easy resistance from brake action should be felt.
  2. Tighten a brake on 6 teeth. Thus wheels should not be turned manually. If for braking creation the lever is required to be cocked further, adjust the parking brake (see. Head Brake system).

Check of the vacuum amplifier of brakes

 PERFORMANCE ORDER

  1. At the switched-off engine several times squeeze out a brake pedal, – with each pressing its course should decrease.
  2. At the squeezed-out pedal of a brake start the engine, – the pedal should move down.
  3. Holding a pedal of a brake squeezed out, muffle the engine. If when keeping pedal within 30 seconds its course does not change, the vacuum amplifier as it should be.
  4. If one of listed above checks yielded unsatisfactory result, repair or replace the vacuum amplifier (see. Head Brake system).


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3.9. Check of a condition of system of production of the fulfilled gases









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