Prorolling of brakes

If the brake pedal is moving "softer" (fail), and its working stroke has increased, then there is air in the system. This affects the efficiency of braking. Bleeding the brakes is just necessary. Otherwise, you are guaranteed to create emergency situations.

Bleeding the brake system is mandatory and after any, even minor, repairs (if there was interference in it). Each specialist has his own "keys" and "chips". We'll look at the basics. Bleeding the brakes will require the assistance of an assistant.

The actions described below can not be performed on cars equipped with ABS (self-locking system), since other, special tools are needed to pump the brake system of these vehicles. In this case, it is better to instruct the specialists.

There are several types of brake systems. There are diagonal, there are parallel. Bleeding of brakes starts from the longest main line so that no air remains in the system.

Parallel pumping system: rear right and back left, then front right, then - front left. In the diagonal, the braking occurs somewhat differently: the rear right, front left and rear left, front right (as they are in separate contours of the master cylinder). In case you have a fluid leak on one of the circuits, the second circuit will help stop the car. The efficiency of braking in this case will significantly decrease, however, when the alarms are activated, you can get to the nearest service station, repair the malfunction and bleed the brakes.

First. In the event that air enters the system due to a drop in the liquid level in the feed tank or when the brake pipes separate from the master cylinder, the brake units (all four) must be pumped.

The second . When the brake pipe is separated only by the wheel, then only this caliper or the brake cylinder must be pumped.

Third. In the case of separating the brake pipe, somewhere between the main cylinder and one of the brakes, the part of the system serviced by the disconnected pipe should be pumped.

And now - the work itself, the purpose of which is to dump residual air (brake amplifier unit) by repeatedly pressing the brake pedal. Of course, the engine must be muffled.

Remove the lid from the master cylinder and fill it with brake fluid. Install the cover in place. Do not skimp on the liquid! Buy only high-quality!

We prepare the vessel (transparent, clean), a piece of tube (made of plastic or rubber), suitable for the pumping through the diameter (it should be tightened tightly), the brake fluid, a wrench.

We begin with the rear right wheel. We loosen the bleeder slightly and clamp it in a position that will allow it to be quickly weakened.

One end is connected to the bleeder (pushes), the second - we immerse in a prepared transparent container with brake fluid.

Now the assistant comes into work. He must press the brake pedal slowly several times to create pressure in the system and hold the pedal in the lower position.

Now open the bleeder and wait for the liquid to start. It is necessary to follow the air bubbles emerging from the tube immersed in the container. When the flow of liquid in this tube is slowed down, we tighten the union and ask the assistant to release the pedal.

Manipulation repeat, until the brake fluid begins to flow clean, without air. Then tighten the nipple and go alternately to the front left wheel, to the left rear and to the front right. The procedure is repeated every time. Always check the liquid level in the master cylinder tank.

At the end, the master cylinder tank is filled with liquid. Check the functioning of the brakes. If there are dips, the brake pumping is repeated. The pedal must be elastic.

Important: the brake fluid is not reused!