Mercedes S-class W202

1993-2000 of release

Repair and car operation

12.11. Removal of air from brake system

THE GENERAL DATA

Cars without антипробуксовочной systems ASR

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The prevention

The control electronic device of firm Mercedes is necessary for removal of air from brake system of the car with ASR. The device is connected to diagnostic штеккеру on the right in a motor compartment. By pressing a key air from ASR-system automatically leaves.

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After each repair of brakes at which the brake system opened, air which necessarily should be removed therefrom can get into pressure head pipelines. A sign of presence of air in system pipelines is lowering of a pedal of brakes by pressing it a foot without notable resistance. In this case it is necessary to eliminate негерметичность and to remove air from system.

Air is given by pressing a brake pedal, the assistant is thus necessary still. If it is necessary to remove air from all brake system it should be deleted from each brake cylinder separately. At regular replacement of a brake liquid within the limits of maintenance service it is necessary to delete air from all four brake cylinders that it has not got into brake system.

Sequence of removal of air:

1. The right back support.

2. The left back support.

3. A forward right support.

4. A forward left support.

If the support was replaced or under repair, as a rule, enough removal of air from the corresponding cylinder. If repair was made at an empty tank for a brake liquid removal of air from all brake system is necessary.

Before air removal unscrew a cover of a tank of a brake liquid and fill in a brake liquid to a mark "max".

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The prevention

During air removal observe of a tank of a brake liquid. Level of a brake liquid should not fall too low, differently through a tank air will be soaked up. Always add only a fresh brake liquid!

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PERFORMANCE ORDER

1. Remove a dustproof cap from the valve сапуна a support. Clean the valve, put on a pure hose, and other end of a hose lower in a vessel half filled with a brake liquid. 2. Charge to the assistant to press a brake pedal (to "swing"), while in brake system there will be no pressure that is felt on resistance increase by pressing a pedal. 3. When sufficient pressure will be created, completely press a brake pedal and hold it in such position. 4. Open the valve сапуна on a support wrench turn approximately on a half-turn. Pouring out liquid collect in a vessel, watch that the hose end constantly was below liquid level in a vessel. 5. As soon as pressure of a liquid will decrease, at once close the valve сапуна. 6. Repeat inflating process, pressure will not increase yet. Press down to refusal a brake pedal, hold a foot on a pedal, open the valve screw сапуна, pressure will not fall down yet, and twirl the valve screw. 7. This operation repeat on one brake cylinder until occurrence of vials of air in the brake liquid which are flowing down in a vessel will stop. Should flow out about 80 ml of a brake liquid from one brake cylinder. 8. After the prorolling termination remove a hose from the air valve сапуна, put on a dustproof cap. The valve screw easily tighten with the moment 7 Н.м. 9. As remove air from other brake cylinders. The prevention During air removal watch a levelling tank. Level of a brake liquid should not fall too low, differently through a tank air will be soaked up. Add only a fresh brake liquid. 10. After the termination of removal of air add in a tank of a brake liquid to a mark "max". Screw up a cover. The prevention Carry out the safety control:       – Whether prorolling screws are tightened;       – Whether level of a brake liquid is perfectly in order;       – At the working engine make the tightness control. For this purpose press a pedal of a brake with effort from 200 to 300 Н (20–30 kg) within approximately 10 seconds. The pedal should not move. Check tightness of all connections. 11. In summary make some braking in silent street.