Mercedes M-Class W163

since 1997 of release

Repair and car operation

Check of brake system

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 not containing asbestos components.

Except checks through the established intervals of time a condition of brake mechanisms it is necessary to check 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

PERFORMANCE ORDER

Disk brake mechanisms can be equipped with the built-in indicators of wear of the frictional slips, signaling need of immediate performance of replacement of blocks in order to avoid failure of brake disks. Any of listed below signs can point to potential defect of brake system: a) When squeezing a pedal of a brake the car "withdraws" in one party; b) Brake mechanisms when braking publish scraping or squealing sounds; c) The course of a brake pedal is excessively great; d) Squeezing of a pedal of a foot brake is accompanied by the pulsations which have not been connected with operation of ABS; e) Leakages of brake liquid (usually on tire or wheel inside) take place. In case of identification of any of listed above symptoms though it is necessary to make immediately check of a condition of components of brake system.

Brake lines and hoses

PERFORMANCE ORDER

In a hydraulic path of brake system steel tubes are used mainly, - the exception is made by only flexible reinforced hoses serving for connection of tubes with wheel cylinders. The condition of flexible brake hoses should be checked on a regular basis. Park the car on an equal horizontal platform and muffle the engine. Remove caps of rims. Weaken, but do not turn out bolts of fastening of all four wheels. To Poddomkratta the car also establish it on props. Remove wheels. Check all hydraulic lines and hoses of a brake path on existence of cracks, attritions, swellings, deformations and signs of development of leaks. Make sure of lack of signs of a friction of brake lines about suspension bracket and steering elements. Attentively examine all shtutserny connections of a hydraulic brake path on existence of signs of development of leaks, check reliability of fastening of shtutserny bolts and nuts. Bending flexible brake hoses in different directions, make sure of lack of signs of their mechanical damage. Track, that the established hoses were not overwound, - as a binding it is possible to use put on a hose surface a longitudinal color strip. Cracks and cuts most easier come to light at a peregibaniye of a brake hose Повращав a steering wheel, make sure that flexible brake hoses of forward brake mechanisms do not adjoin to elements of a steering drive. In case of identification of signs of development of leakages of the reason of the last should be immediately eliminated (in case of need see. Head Brake and auxiliary systems).

Check of thickness of brake shoes

The assessment of residual thickness of frictional overlays of external brake shoes can be made visually through an aperture in a rim by means of a pocket small lamp. Survey of an internal block in addition needs a mirror. More exact check of a condition of brake shoes is made after their removal, - measurement of thickness of frictional slips needs a calliper.

Disk brake mechanisms of forward wheels

PERFORMANCE ORDER

Experience shows that wear of a brake shoe of a wheel from the forward passenger appears above, than from the driver in view of what survey always should be begun with the right board of the car more often. According to statistics about 1 mm of wear of blocks is the share of 1 thousand kilometers of run under adverse conditions. In normal conditions wear of blocks is much less. Really, at residual thickness of a block of 10.0 mm (taking into account a metal substrate) the block can be maintained at least 3000 more km. Mark with paint the provision of a forward wheel in relation to a nave. It will allow to establish the balanced wheel in the working situation. Weaken wheel bolts, then поддомкратьте a front of the car and establish it on props. Remove the right forward wheel. Measure by a calliper cumulative thickness of a frictional slip with a metal substrate both blocks of the brake mechanism. The limit of wear of forward blocks when replacement should be made immediately, makes 7 mm. The description of procedure of replacement of blocks is provided in Head Brake and auxiliary systems. Having tracked for combination of the labels put in the course of dismantle, establish into place a wheel. Greasing with nothing, screw wheel bolts. Lower the car on wheels and, moving in a diagonal order, tighten bolts with demanded effort.

Disk brake mechanisms of back wheels

PERFORMANCE ORDER

If that is established, remove a decorative cap and through an aperture in a rim visually estimate residual thickness of an overlay of an external brake shoe, - in case of need use a pocket small lamp. For survey of an internal block use a mirror. As well as for forward brake mechanisms the minimum admissible thickness of back blocks makes 7 mm (a slip + a substrate).

Parking brake

To protozoa, and it is possible, the most obvious way of check of serviceability of functioning of the parking brake is car deduction on abrupt descent in the neutral provision of transmission, - the driver should be on the place in the car. If the parking brake is not capable to hold the car, it is necessary to make its adjustment (see. Head Brake and auxiliary systems).