3.10. Replacement of brake fluid, pumping of the brake system

  1. Brake fluid has property to absorb moisture owing to what since a 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.
  2. Brake fluid should be replaced whenever possible in the spring. At operation of the car in the mountain area, on the roads processed by salt and also in the conditions of the sea air containing salts, it is necessary to replace brake fluid more often than it is stipulated in graphics of routine maintenance (see the Section Schedule of Routine Maintenance).
  3. 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.

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.

Replacement of brake fluid and pumping of the brake system and coupling


  1. Disconnect a negative wire from the rechargeable battery.
  2. Uncover the tank of brake fluid (see illustrations the Components of a compartment of 4-cylinder engines which are subject to regular service, the Components of a compartment of the petrol V6 engine which are subject to regular service and the Components of a compartment of the diesel engine which are subject to regular service at the beginning of the Head).
  3. Note a felt-tip pen on a tank wall the level of brake fluid that then not to change it. 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 the brake system.

  1. Fill the tank with new brake fluid to a tag "MOVE".
  2. Carefully clear and remove protective caps of unions of pumping.
  1. Put on one end of a pure transparent hose the union of pumping of a support of the brake mechanism of a forward left wheel, 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.
  1. 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 about 100 ml of old brake fluid before emergence new (she can be recognized on light color).
  2. Tighten the pumping union, close its protective cap and add new brake fluid in the tank.
  3. In the same way pump out old brake fluid consistently from right back, right forward and left back supports. When pumping back supports it is necessary to pump out about 50 ml of brake fluid.

The merged brake fluid anyway has to be pure and without air bubbles.

  1. On models with RKPP attach a hose to the coupling pumping union, give the union and lower about 50 ml of liquid.
  2. Modify the level of brake fluid according to the mark put at the beginning of the procedure.
  3. 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.
  4. On models with RKPP check serviceability of functioning of coupling.
  5. In conclusion check action of brakes on the road with not heavy traffic of transport. 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.