BMW 5 series E39

1. Park the car on an equal platform and switch off the engine. Remove caps from wheels. Ослабьте, but do not remove bolts of fastening of all four wheels.
2. Поддомкратьте a back part of the car and reliably establish on support.
3. Remove wheels (address to Sections “Poddomkrachivanie and towage” or “Controls and receptions of safe operation”).
4. Clear pipelines an autocleaner.

Pipelines for protection against corrosion have a plastic covering. If the covering is damaged, it can lead to pipeline corrosion. For this reason it is not necessary to clear pipelines a wire brush, an emery paper or a screw-driver.

5. Shine with a lamp and check up the brake pipelines going from the main brake cylinder to block ABS and from it to separate wheel cylinders. The main brake cylinder is under the tank of a brake liquid.
6. It is not supposed to bend and rumple pipelines. It is necessary to exclude also occurrence of corrosion damages or retyrannies. At occurrence of the specified defects on the given site it is necessary to replace the pipeline.
7. Brake hoses connect pipelines to mobile elements of brake system. They are executed from a high-strength material, but are subject in due course to formation of a time, swelling and damage by sharp subjects. At occurrence of the specified damages hoses should be immediately replaced with the new.

8. Bend brake hoses hands every which way to reveal presence of damages. Hoses cannot be braided. Watch straightforwardness of colour lines on hoses if they are available!

9. Turn a steering wheel to the right and to the left against the stop. Hoses should not concern somewhere body or suspension bracket elements.
10. Junctions of hoses and the pipeline should not have traces of leakings.
11. Lower the car on wheels.

1. If it has not been made yet, поддомкратьте the car and reliably establish it on support.
2. Mark position of wheels concerning naves that after installation отбалансированные wheels have occupied the former position. Ослабьте bolts of fastening of a wheel. Remove wheels.
3. Now it is possible to see supports of disk brake mechanisms in which are колодки. In each support are available external and internal колодки.

4. Visually check up a thickness колодок from above through a support.

5. Check up a thickness external колодки. If the thickness comes nearer to a deterioration limit, remove колодку and measure its thickness by means of calibre.

6. A limit of deterioration brake колодки forward and back brakes is the thickness of 2 mm.
If the thickness of frictional overlays is less, or if they are worn out on the one hand more than with another колодки it is necessary to replace. Remember that frictional overlays are usually pasted on a metal substrate колодки - its thickness should not be considered at measurement. Always replace колодки on both parties of the car (in the complete set on one axis) even if one of them is worn out only, otherwise braking process will be non-uniform.

Experience shows that deterioration brake колодки in 1 mm corresponds at least 1000 km of run. It corresponds to adverse service conditions. At normal operation firmness колодок it is considerable above. At a thickness brake колодки a disk brake of 5 mm (without a back plate) колодка than 3000 km can be maintained still not less.

7. Remove supports, without disconnecting brake hoses.
8. Check up a condition of a brake disk. Examine it on presence of furrows, deep scratches and overheat sites (they look as the blue or decoloured stains). At detection of signs of damages or deterioration the disk can be removed and pierced in a mechanical workshop; if there is no such possibility, it is necessary to replace it. Both in that and in other case it is necessary to replace or pierce both disks even if one of them is worn out only.

1. Using instructions of the Head Brake system, remove back brake disks with drums.

2. Measure a thickness of frictional overlays on boots of back brake mechanisms and examine them on presence of signs of pollution by a brake liquid or greasing. If the overlay has a thickness within 1.5 mm over heads of rivets or the metal basis in the most thin place, replace all boots. Address to an accompanying illustration. Boots are subject to replacement also треснутые, заполированные to shine and polluted by a brake liquid or greasing. Replacement procedure is described in the Head Brake system.

3. Check up a condition of coupling and keeping springs of boots, and also the adjusting mechanism. Make sure that all these components are correctly established and are in working order. The worn out or deformed springs can serve as the reason of premature deterioration of frictional overlays.
4. Check up wheel cylinders on presence of signs of leaks, accurately having removed protective rubber covers. Presence of insignificant traces of a moisture under covers is supposed. If under them the brake liquid is found out or it follows from the wheel cylinder it is necessary to repair or replace cylinders capitally (address to the Head Brake system).
5. Check up drums on presence of deep scratches, furrows of cracks and перегретых sites which look as the decoloured stains. If the revealed defects cannot be eliminated by means of an emery paper, the drum should be pierced in a workshop (address to the Head Brake system for more detailed information).
6. Following instructions of the Head Brake system, establish brake disks with drums.
7. Establish wheels, but yet do not lower the car.

1. The elementary, and it is possible, the most obvious way of check of work of a lay brake is car installation on an abrupt slope with the cocked brake and transmission in neutral position (at check you should be in the car). If the lay brake does not keep the car from скатывания, it is necessary to make its adjustment as it is described in Section Adjustment of a lay brake.
2. Lift and put a back part of the car on supports.
3. Tighten a lay brake on 5 teeth. Turn wheels by hand. On wheels resistance from brake action should be felt easy.
4. Tighten a brake on 6 teeth. Wheels still should be turned manually. If for creation of braking the brake has to be tightened further, adjust a brake as it is described in Section Adjustment of a lay brake.
5. Lower the car on wheels.