2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42
You need to know what order to bleed the brakes in order for the entire system to work as stably as possible. At the same time, it is important that not a single cubic millimeter of air remains in the tubes and hoses, because it is it that interferes with braking. But first, it is worth considering the entire braking system in order to know its principle of operation and understand for what purposes this or that node is needed.
Vacuum Brake Booster
This is the very node of the system that provides the maximum degree of comfort, improves driving. Of course, it does not affect the order of pumping the VAZ 2109 brakes, but for a complete picture it is necessary to talk about it. A vacuum booster is installed between the master brake cylinder and the pedal. In fact, this is an intermediate link that allows you to increase the force that comes to the brake pedal from the driver's foot.
Inside you can see the membrane, and the rod from the brake master cylinder is connected (not hard) to it. On the other handbrake pedal connected. The amplifier works due to the vacuum created by the carburetor or a special pump. It all depends on whether the injection or carburetor fuel injection system is used on a particular car. But then comes a more interesting device - GTZ. It will be discussed below.
Brake Master Cylinder
It is mounted on the body of the vacuum booster with two studs. Its replacement would not be a problem if it were not for the brake pipes, in which the tips are made of soft metal. It is precisely the main cylinder that affects the procedure for bleeding the brakes of the VAZ 2107 and other models. The fact is that with its help pressure is created in the system, which is enough to compress the calipers of the pads. And there you need a lot of effort, because stopping a car at a speed of even 60 km / h is a difficult task.
Inside the master cylinder is hollow, two pistons move in it. Moreover, their movement is synchronously performed, which allows you to create the same pressure in all circuits of the brake system. But there is a huge advantage in using this design of the main brake cylinder - if the tightness of one tube is broken, the second circuit continues to work stably. Therefore, the safety index is improved. Even if one hose breaks, the machine will be able to stop without problems.
Shoe drive calipers
But these are the power devices of the brake system. And the order of pumpingbrakes VAZ 2110 implies that you must bleed air from the calipers. The reason for this is simple - calipers are the end point for brake fluid. She doesn't go further. And what is a caliper, why did the designers come up with such a name? In fact, it could also be called a cylinder, since the design is identical.
This is an aluminum case with a cavity inside. It is filled with fluid during the operation of the brake system. When you press the pedal, pressure rises, as a result of which the steel piston, tightly installed in the caliper, is squeezed out and sets the pads in motion. When the pressure drops, the pads return to their original position under the action of the springs. The rear drum brakes are equipped with cylinders, in the middle part they have a hole for the fluid supply, and on the edges of the pistons that drive the pads.
Expansion tank
An integral element of the system is installed either on the body of the main brake cylinder, or in close proximity to it. Remember that the procedure for bleeding the VAZ 2114 brakes implies the presence of fluid in the reservoir. It is made of plastic, has holes at the bottom for connection to the brake cylinder. Top hole for filling liquid, it is closed with a stopper.
The latter has a very specific design. This is not just a plug, but a symbiosis with a float-type level sensor. A metal axle is installed, at its lower end there is a light float, which is immersed in the brake fluid. Abovethere are two contacts. When the level drops, they close and voltage is applied to the incandescent lamp, which is installed in the dashboard. This suggests that you need to fill the system with fluid, as well as inspect for leakage.
How to upgrade
To bleed your brakes you need:
- Brake fluid.
- Transparent tube and jar.
- Key 19 (for removing wheel bolts).
- Key to 8.
- Special crimp wrench for 8.
- Assistant.
The rear wheel on the right side is pumped first. It is located farthest from the master brake cylinder. It is necessary to follow the order of pumping the brakes, otherwise the efficiency of the work done will be zero.
Assist seated in the driver's seat. You put a tube on the bleed valve yourself. Lower its free edge into a jar with a small amount of liquid. Fill the tank to the maximum, the assistant depresses the brake pedal several times, after which it fixes it in the extreme position near the floor. You unscrew the fitting (half a turn is enough). Look at the tube, liquid with air bubbles will begin to flow through it. And so several times until there is no air left. Then proceed to the second rear wheel. After him, the right front. And the last one to be pumped is the left front wheel.
Conclusion
That's it, the bleeding of the brake system is complete. Before assembly, be sure to check whether theall fittings are tight. It is advisable to put rubber caps on them so that clogging does not occur. This will be a plus for you, the next repair will be easier to unscrew the fittings.
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