Hydraulic brake and its design. Hydraulic brakes on the bike

The brakes, both mechanical and hydraulic, the vector of actions only one – stop the vehicle. But there is a whole range of issues concerning both types of schemes. Worth to consider in more detail the hydraulic brake. Its main difference from the mechanical is that to drive the pads you use hydraulic hose, not a cable. In the embodiment of hydraulic connection of the brake mechanism with the handles directly.

Working Principle

To understand how a hydraulic brake, it is necessary to consider its structure. To fill the hydraulic lines is used a special oil or brake fluid under slight pressure. Press the special handle displaces fluid from the hydraulic system, with the result that it puts pressure on the slave cylinder, mounted on the fork or Bicycle frame. As a result, actuated brake pad and the piston, which leads to blocking of wheels.

It's pretty simple. Diagram of hydraulic brakes gives a visual representation of the effects of the entire described system. Working with such a device requires the understanding that brake fluid is extremely toxic, which often becomes the cause of severe poisoning. In addition, it can have a detrimental effect on the plastic parts and paint.

The Advantages and disadvantages of hydraulics

The Wide spread of such braking system can be explained by the dosing accuracy and high speed of response of the mechanism at the push handle. However, the advantages do not end there, but they have become for many athletes deciding the issue of converting to hydraulics.

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Another important point is the great endurance, which have disc brakes hydraulic. No less important is the accuracy. The system has proved reliable over many years use in cars. Proper care allows you to make a hydraulic brake mounted on the bike, it will be much more reliable compared to mechanical. A heightened sense of strength dosage allows you to use the brakes as accurately as possible. It's a must in extreme sports.

Among the disadvantages of the hydraulic system there are several basic. The cost of such a system is significantly higher compared to the mechanical, so the price of the bike with hydraulics will be significant. Such a device is a technologically advanced and highly complex site which requires maintenance skills and a clear understanding of the design features. Not every biker has the necessary knowledge for self-disassembly and repair of hydraulic brakes.

Careful treatment require nodes such as brake hoses and tubes. This is a very vulnerable place, with a direct impact on the functioning of the entire system. Hydraulic brakes on the bike can be picky about the quality of the oil or brake fluid, so bleeding should be carried out after you have made a thoughtful choice. Quite often they are used in tandem with traditional disk. Is a little to say about them.

Types hydraulic disc brakes

Unlike the disc brakes from rim is that the braking is carried out by a clamping disk which is attached to the hub pretty hard special pads, is fixed on the back frame and front forks on the feathers. The main cylinder uses a different design so that hydraulic brake can be one of the following types: single piston, floating two-piston or opposed pistons, mnogovolnovye. Mainly used the third kind. You can meet the models belonging to the first sight, but due to certain shortcomings of their almost completely replaced the second and third types. A complex system with many pistons are used for downhill, where the decisive role is assigned power, not the simplicity of the design.

Distinctive features

If we consider the hydraulic brake, then it is appropriate to note the possibility of using oil or special fluids. Each option has both disadvantages and advantages, but so far there is no unanimous opinion on this issue. The caliper is solid, so the design becomes stiff, light, and compound, characterized by lower costs, but greater complexity in terms of service.

Disk hydraulic brake is reliable, but the repair is quite difficult to produce in the field. However, it fails in very rare cases. There are a number of problems associated with the fact that hydraulic disc has a very small gap between the pads, and in the event of severe contamination, they wear out much faster. However, in this case a mechanic can not boast of any advantage, as it spoiled the pads cannot be adjusted on the go, and in the case of the hydraulics is carried out automatically in the process of wear.

Disk brakes are much more expensive the rim, theirthe load on the bushing when braking strongly increased, although this issue can be described as controversial. Not worth more to delve into this topic, it is better to talk about the producers on the market of hydraulic brakes.

Browse brands

Despite the fact that there are so many types of braking systems on bikes average level is now quite common brake hydraulic. With the growth of their popularity can be noted a significant drop in prices. It is therefore possible that you decide to refit your bike under a hydraulic brake system. Examples of this are many, but we will only mention a few.

One of the manufacturers is Shimano. Brake hydraulic this brand includes a few lines. The most recent was Deore. Its characteristic is stable operation of the master cylinder, comfortable to use handles. The rider can get pleasure from how the whole system work clearly and obediently behaved. The picture is slightly marred by the rattling of the brake handle itself. The new collection presents two options for fastening the rotor bolt and capstan. In one set comes with two pads & ndash; metallic and rubberized. The deterioration occurs as quickly as possible. Overall, this hydraulic brake is of excellent quality that is worth the money spent for its purchase, namely $ 50.

Brake CLIM 8 CLARK'S are characterized by the fact that buying a fixture for the price of a single-cylinder brakes, you get fully working multi-cylinder device. However, we all know that miracles don't happen, so here is a little alarming handle design, but this option finds its fans. But all the hoses got reinforcement metal and Kevlar.

The Most interesting design, with six cylinders, available from the downhillers. This system is characterized by lack of increase in mass. In addition, the installation process is required to fit the pads to the discs as thoroughly as possible.

The hydraulic Brake is characterized by the fact that reviews about it can be found quite varied. Often say that such a system is quite finicky in terms of maintenance. However, this statement can be called controversial. It is not difficult, and you can see for yourself in this. In the service brake system is the most difficult work is pumping. With such a problem faced by almost every biker that uses hydraulics. You can appreciate how difficult this procedure is.

Symptoms

The first sign that the brakes are faulty, is the fact that they are self-braking. This can be explained by the fact that within the system is the small amount of air. To happen after the fall of the bike by opening the hydraulic circuit, and with a low level of brake fluid in the reservoir.

As a property of air to be compressed markedly differs from that of liquids, when injected into the system he might work as a gas spring. This creates fluid pressure that activates the brakes. Rear hydraulic brake, which can engage in such Amateur in that case, if the working piston started to seize up. This may be caused by the fact of falling water in the hydraulic system. Another point that should alert you is the loss of elasticity of the brake handle in comparison with the early period of operation. But if hydraulics do not respond to your command, stop the bike, then the solution there will be only one – immediate replacement of the entire system.

Troubleshooting and repair

To understand what exactly happened with the brake system of a Bicycle, it is necessary to conduct some experiments. The first requirement is to remove the wheel, where there is this problem. Next, you will need to make some effort on cleaning the brake clipper from dirt that is easiest to implement through a toothbrush. The main task in this case – remove the pads.

After the opening of access to work the pistons you have to push them with a screwdriver, and then gently press the brake handle. Both pistons should move forward. If there is a jamming of one of them, then you want to use the kit to remove existing faults. Piston system should be thoroughly inspected for various leaks. In the case of their presence it is possible to speak of a strong deterioration of the group of cylinders. Now you'll need to replace the pistons or special sealing rings on them. In the end you need to carefully examine the entire hydraulic line. A good sign is the absence of kinks, dents and damage another kind. If available you should replace all the hydraulic hose.

Why do we need upgrading?

If you press the brake handle, and she walks up to the grips, that is, its stroke is too large, but pad it does not move or does not reach the brake disc, it is possible to draw conclusions about the necessity of pumping. A similar situation is observed and in that case, if the lever is too easy to press whenpressing or even fails. When the handle is pressed sharply, and after the system response is not returned to its original position, is also required to bleed hydraulic brakes on a Bicycle.

In these cases, the reason for system failure was the air that was inside. First and foremost you want to find the place, through which the transmission. It should be noted that this may be preceded by damage to hydroureter, the weakening of the bleeder on the cylinder, the boiling of the fluid due to overheating. When the entire system is checked for leaks fluid, you can begin to fix it.

If you need to bleed the hydraulic brake, the physics in this case speaks of the need to do it on a horizontal flat surface. Pads should be diluted so that they did not get to drive. Next you want to Unscrew the master cylinder, then secure it horizontally. Each system features of the flow can vary, so you should use the instruction in which everything is painted in detail.

Final work

Next, we need to put on the bolt of the pumping sleeve, and then immerse it in a container to collect the remaining fluid. After this you need to Unscrew the cap of the expansion tank to the maximum level to fill with fluid. Should be several times to press the hand brake, but it is recommended to do it smoothly and slowly. Pushing required until until tohost. Then, holding the handle, Unscrew the leveling bolt with a plastic tube and add the fluid in the expansion tank. To carry out this procedure is recommended as long as the stick will not shave the necessary level of rigidity. You can then screw the expansion tank, and then clean up all the tools. Everything is ready, now the brakes are completely bled.

Insights

As you can see, the rumors of the difficulty of pumping overly exaggerated. The hydraulic brake system is characterized in that it has more advantages than disadvantages. A real biker is not so much important the principle of operation of some mechanism, and the fact that he has the ability to move freely in space. And hydraulic brakes on your bike allow it.

Good luck with your travel!