If the brake pedal is moving "softer"(fail), and its working stroke has increased, so there is air in the system. This affects the efficiency of braking. Bleeding the brakes is simply necessary. Otherwise, you are guaranteed to create emergency situations.
Bleeding the braking system is mandatory and afterany, even minor, repair (if there was an intervention in it). Each specialist has his own "keys" and "chips". We will look at the basics. Prorolling the brakes will require the assistance of an assistant.
The actions described below can not be performed oncars equipped with ABS (self-locking system), because for the pumping of the braking system of these vehicles you need other, special tools. In this case, it is better to instruct the specialists.
There are several types of brake systems. There are diagonal, there are parallel. The bleeding of the brakes starts from the longest main line so that no air remains in the system.
Parallel flow system:rear right and back left, then front right, after - 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 the event that you have a fluid leak on one of the circuits, the second circuit will help stop the car. The efficiency of braking will drop significantly, but with the alarms on, you can get to the nearest service station, repair the malfunction and bleed the brakes.
First. In the case when air enters the system bycause of a drop in the level of the liquid in the feed tank, or when the brake pipes have separated from the master cylinder, the brake units (all four) need to be pumped.
The second. When the brake tube is separated only by the wheel, then only this caliper or the brake cylinder must be pumped.
Third. In the event 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.
Well, now - the very course of work, 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 we open the bleeder and wait for the startout of the liquid. It is necessary to follow the air bubbles emerging from the tube immersed in the container. When the flow of liquid in the tube slows down, the fitting is clamped and ask the assistant to release the pedal.
Manipulation repeat, until the brake fluid is notwill flow out 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: Repeated brake fluid is not used!
