Leakage of fluid, as well as depressurization of the brake system is often provoked by old rotten or damaged brake pipes. These are very important elements. On these highways, fluid from the reservoir is supplied to the brakes of all four wheels. If any tube becomes unusable, it is better to replace it completely, if possible. Let's see how the brake pipe is replaced on most cars.
Device, principle of operation
So, the driver stops the car by pressing the brake pedal. The latter acts on the brake force amplifier, and the latter on the GTZ, compressing the fluid in the lines.
Under the action of the GTZ force, the liquid is compressed and passes into the zone with minimal pressure. These are tubes, and then - working mechanisms. Brake fluid presses the drive and the caliper compresses the pads. When the pressure on the pedal loosens, the pressure in the brake booster decreases. The springs in the mechanism open the pads. The fluid moves back to the expansion tank - to the area where the pressure is minimal.
The movement of brake fluid is carried out through copper tubes. The latter are connected to the main brake cylinder and laid along the bottom of the car to the brake mechanisms. The connections of the tubes to the mechanisms and to the GTZ are made in the form of a thread - this ensures maximum reliability. After all, the pressure in the line can be quite high.
To increase the reliability of the systems, the tubes are connected diagonally to the GTZ. This makes it possible to use the brake when the latter fails. For example, from the GTZ, one of the tubes connects the front left brake mechanism and the rear right. Another tube directs fluid to the front right and rear left wheels. To ensure that the pressure in the system does not exceed the allowable pressure, a pressure regulator is installed at the places where all the tubes are connected. In common people, he is called a "sorcerer."
Signs of a need for replacement
Any, even inexperienced motorist will be able to independently and effortlessly determine whether it is worth changing the brake lines. Usually, a complete replacement is necessary if fluid leakage from the system is observed, if the drums were overheated. It is also advisable to replace the handset if the pedal free play or braking distance has increased. Brake tube replacement is also recommended if the pads have uneven wear. This means that they work under different pressures.
Reasons for tube failure
As a rule, on most cars, the brake line becomes unusable due to corrosion. Often cracks form on old tubes. Then brake fluid slowly flows out of these cracks. The tubes are made of copper and, it would seem, should not corrode, but this is not so. Corrosion is eating up highways, and the negative effects of the external environment must be added here. Particularly negatively, the environment affects the metal of the pipes in winter, when utilities water the roads with caustic reagents.
Also one of the reasons for failure is poor fastening of the trunk to the body. Often the highway is fixed to the bottom of the car and is not protected by anything. In winter, the bottom of the car can cling to various obstacles and as a result, the tube cracks or breaks. Also, if the element is constantly moving with the body, then over time at the place where the highway bends, a kink is obtained. The part is easily damaged.
How is replacement done?
The process of replacing the brake pipe will require the skills of a plumbing owner. Have to use a traditional and special tool. Tube repair is performed when it is not possible to replace the trunk with a new one.
To replace, unscrew the tube from the brake cylinder, and the reverse end is turned out of the main brake cylinder. Then a new product is purchased. The handset can be purchased at auto parts stores, but it is important to remember the thread pitch. For foreign cars, this is thread 10 in increments of 1. This spare part already has two nuts and is flared. The length of the tubes on sale can be different, and you need to pick it up by car. So, on some models of auto parts can be laid with a margin, on the other model this stock is not. Replacing the brake pipe involves turning the old one and wrapping a new one in its place.
How to change the front tubes?
To work, you will need a special key. It is a tool with a preload bolt. The key resembles a cap, but you do not need to purchase a cheap product in stores. Such keys are made of soft alloys that do not withstand heavy loads. The nut on the tube is made of steel - the key easily fails, and the faces on the nut slip together. Unscrewing and twisting such a part then can be a big problem. The nuts are tightened tight enough and you can water them WD-40, but you should not heat. When heated, the brake fluid begins to boil, due to the high pressure in the system it can break the hoses, especially if they are old.
Instruction manual
Here's how to replace the brake pipes on the VAZ 2110. First of all, you need to remove the wheel from the side where the pipe will change. Then you need to find the brake hose. It is connected at one end to a support, and at the other end to a tube. Carefully unscrew the nut on the tube with a special key while holding the hose with the other key. The second end of the tube is connected to the GTZ. In the same way, unscrew the nut of the tube from the brake cylinder.
Then a new one is screwed into the place of the old one. First, tightly wrap the tube to the GTZ, and then to the brake hose on the caliper. Before connecting the trunk to the system, lay the handset along the body as it was installed. At this, the replacement of the brake pipe 2110 can be considered complete. But since the system was depressurized for some time, you should pump the brakes. It is not necessary to fully pump the brakes. This is done only where there was a replacement. Remember that the tubes are connected diagonally.
For example, if there was a replacement of the right brake pipe in front, then you should start pumping the system from the rear left wheel and vice versa if the left front pipe changed.
Rear end
There is nothing complicated, except that the highway is longer and it is connected as follows - the longer part of the tube is connected to the GTZ and screwed to the "sorcerer". Then, with a short tube, the "sorcerer" is connected to the brake mechanism on the wheel.
Replacing the rear brake pipe is as follows. If there is a flyover or pit, then you do not need to remove the wheel. First, a liquid wrench is applied to all threaded connections, then wait a bit. After that, a screwdriver or other suitable tool is used to turn off the self-tapping screws fixing the tubes to the car body. After that, two fittings are unscrewed with a suitable wrench, securing the tube to the brake hose and to the regulator. The item is retrieved, and a new one is installed instead. If the long line to the "sorcerer" is damaged, then the actions are similar, they only unscrew the fitting from the GTZ and from the regulator.
After the replacement, do not forget to add the brake fluid to the expansion tank to the required level and be sure to bleed the system, as it has scored air inside, and the braking process will be ineffective. If you made a replacement of the front brake pipes on the left, then you do not need to pump another line.
Are there any features of replacement on foreign cars?
Most budget, and expensive foreign cars have a standard brake system. Therefore, if necessary, here you can change the trunk yourself. Replacing the brake pipes at Nissan is no different from the same operation at the VAZ.
Conclusion
The brake system is a very important component of any car. It is necessary to regularly monitor the condition of the tubes and the level of the working fluid in the tank. Do not hesitate to replace the lines if they are damaged. A working brake system is the key to your safety.