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17-27-proverka-tormoznojj-sistemy.html
17.27. Check of brake system Annually or each 20 000 km of run
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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 solvents on the basis of gasoline for dust removal. The dust should be washed away a special cleaner of brake system or methyl alcohol in drain capacity. After rubbing of components of brake system by a damp rag this rag and contents of drain capacity should be kept in the closed and signed container. Further whenever possible try to use components not containing asbestos. |
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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 system. For driving safety the checks of brake system described below procedure are most important of all procedures made by you on car service. |
Signs of malfunctions in brake system
Disk brake mechanisms have the built-in electric indicators of wear of frictional slips which cause inclusion of an alarm lamp on the dashboard in case wear of slips reached critical size. After inclusion of an alarm lamp of a slip it is necessary to change immediately, differently brake disks will be damaged and they will need expensive repair.
Any of listed below signs can point to potential defect of brake system:
- When squeezing a pedal of a brake the car "withdraws" in one party
- Brake mechanisms when braking publish scraping or squealing sounds
- The pedal of a brake has an excessive course
- The pedal of a brake pulses (it normally only at ABS system work)
- Leakages of brake liquid (usually on tire or wheel inside) are observed
In case of detection at least one of these signs immediately examine brake system.
Brake lines and hoses
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In brake system steel brake tubes, except for the flexible reinforced hoses at forward wheels and as connections at the back bridge are generally used. Regular survey of all these lines is very important. |
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- Park the car on an equal platform and switch off the engine. Remove caps from wheels. Weaken, but do not remove bolts of fastening of all four wheels.
- To Poddomkratta the car and reliably establish it on axial support.
- Remove wheels (see. Undressed Poddomkrachivaniye, towage and change of wheels or the Operation manual on your car).
- Check all brake lines and hoses on existence of cracks and attritions in their external covering, 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 components. Check all shtutserny connections on existence of signs of leaks and make sure of reliability of fastening of all bolts and clips of brake hoses.
- At detection of leakages of liquid or their damages it is necessary to eliminate immediately. For more detailed description of procedure of repair of brake system address to Head Brake system.
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Disk brake mechanisms
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- If it was not made yet, поддомкратьте the car and reliably establish it on axial support.
- Now it is possible to see supports of disk brake mechanisms in which there are blocks. In each support there are external and internal blocks - it is necessary to check both that and others.
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- Estimate thickness of blocks, having glanced in a viewing opening in the support case. If the thickness of frictional slips makes 2.0 mm or less or if they are worn-out on the one hand more than with another, it is necessary to replace blocks (see. Head Brake system).
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- Remember that frictional slips are usually pasted on a metal substrate of a block - its thickness should not be considered at measurement. Always replace blocks on both parties of the car (in a set on one bridge) even if one of them is worn-out only, otherwise process of braking will be non-uniform.
- Remove supports, without disconnecting brake hoses (see. Head Brake system).
- Check a condition of a brake disk. Examine it on existence of furrows, deep scratches and overheat sites (they look as the blue or decoloured spots). At detection of signs of damages or wear 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. In more detail procedure of survey and repair is described in Head Brake system.
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Drum-type brake mechanisms
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- Using instructions of Head Brake system, remove back brake drums.
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- 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 2.0 mm over heads of rivets or the metal basis, replace 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.
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- If slips are pasted to a boot substrate, measurement of their thickness is made from a substrate surface, as is shown in drawing (And); in case slips приклепаны to boot metal, measurement is made from a slip surface to tops of heads of rivets
- 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.
- 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 (see. Head Brake system).
- Check drums on existence of deep scratches, furrows of 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 (see. Head Brake system for more detailed information).
- Following indications of Head Brake system, establish brake drums.
- Establish wheels, but yet do not lower the car.
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Parking brake
To protozoa, and it is possible, the most obvious 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 you should be in the car). If the parking brake does not hold the car from a skatyvaniye, it is necessary to make its adjustment as it is described in Head Brake system.
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