3-13-zamena-tormoznojj-zhidkosti-i-prokachka-tormoznojj-sistemy.html

3.13. Replacement of brake fluid and pumping of the brake system

General information

Brake fluid is hazardous to health. Do not suck away it a mouth through a hose. You store brake fluid only in the capacity to which casual access for children is excluded.

PERFORMANCE ORDER

Brake fluid is hygroscopic, i.e. has property to absorb moisture owing to what over time the point of its boiling decreases that at considerable load of brakes can lead to formation of steam bubbles in brake lines and reduce efficiency of action of brakes. Replacement of brake fluid will require the help of the assistant, however on HUNDRED this procedure is usually carried out by means of the special device. When pumping the brake system the car has to be parked on the flat horizontal platform.

Replacement of brake fluid and pumping of the brake system

PERFORMANCE ORDER

Switch off ignition and separate the ABS activator electrical wiring socket. Uncover the tank of brake fluid (see illustrations Components of a motive compartment of models with the M52 engine, Components of a motive compartment of models with the M51 engine, Components of a motive compartment of models with the M62 engine). Note a felt-tip pen on a tank wall the current level of brake fluid that then to allow its excesses when replacing brake shoes. Pump out brake fluid from the tank, having left a layer of liquid about 10 mm thick at its bottom. Do not delete all liquid from the tank, otherwise air will get to a hydraulic actuator of the brake system and coupling. Fill the tank with fresh brake fluid to a tag "MOVE". Carefully clear and remove protective caps of unions of pumping. Put on one end of a pure transparent hose the union of pumping of the back right brake mechanism, and insert other end into a vessel for collecting brake fluid. In capacity it is necessary to pour a little brake fluid and to watch constantly that the end of a hose was shipped in it. Also capacity should be raised, at least, by 30 cm over the pumping union to provide pressure and to interfere with intake of air to it. Connection of device for pumping to the back brake mechanism Ask the assistant to 3-5 times to press sharply a brake pedal with intervals 2 ÷ 3 with and give the union on 1/2 ÷ 3/4 turns at the squeezed-out pedal. After the pedal of a brake will rest against a floor, tighten the union. Take away a leg from a pedal. Repeating this process, pump out old brake fluid (before emergence new who can be recognized on light color). If at the bottom of the tank there is a liquid layer less than 10 mm, the system should be pumped over. Tighten the pumping union, close its protective cap and add new brake fluid in the tank. In the same way pump out old brake fluid consistently from other supports in the sequence: back left, forward right, forward left. The merged brake fluid anyway has to be pure and without air bubbles. Modify the level of brake fluid according to in advance put mark Press a pedal of a brake and check its free wheeling. Make sure that the pedal of a brake does not "fail" at its squeezing – the free wheeling of a pedal has to make its no more than 1/3 full speeds. Check action of brakes on the road with not heavy traffic. For this purpose it is necessary to make not less than one strong braking, having checked ABS action at the same time. A sign of correct work of ABS is the brake pedal pulsation when braking. The effect of action of ABS is best of all shown on the unpaved road.