The brake system is an important component of any car. Lada Priora is no exception. It is important to monitor the proper operation of the elements and, if necessary, replace them. What brake discs to put on the "Prior" and how to replace them with your own hands? About all this and not only - further in our article.
Signs
What symptoms can be used to determine if brake discs need to be replaced on the Prior? The main sign of wear is the behavior of the car. In case of deformation or worn working surface of the disc, the brakes will “wedge” when you press the pedal. Also, when the pads are triggered, a strong rattle is possible (not to be confused with the squeak of the friction material itself). If there is a crack, braking is accompanied by a beating on the steering wheel. The friction pad touches the smallest beads and other irregularities on the working surface of the disc.
As a result, her material crumbles, and you feel increased vibration. It can be transmitted not only to the steering wheel, but also throughout the body. Depends on the severity of wear or the amount of deformation. In this case, a visual inspection of the item is recommended. If there are no visible cracks, remove the wheel and slide your finger along the working surface of the disk. If you feel uneven, this says that the element overheated and deformed due to expansion and contraction. It should be noted that the beating of the steering wheel can only be when you press the pedal. If this symptom is observed while driving, you may have unbalanced wheels or one of the weights has dropped. Often with increasing speed, these vibrations increase.
About groove
Is it wise to repair the brakes? "Priora" is a relatively inexpensive car, but the price of grooving old discs is up to 75 percent of the cost of new elements. In addition, this recovery method is ineffective in case of severe deformations in the form of cracks and large output (the thickness of the working surface is less than 6 millimeters). Automobile reviews say that a smart solution would be to buy a new set of discs. With a groove of old, the likelihood of repeated symptoms is high. After a couple of thousand kilometers, such a car begins to vibrate again, and the brakes become less informative. Moreover, it makes no difference whether the groove was performed on the removed element or directly on the hub. If you want to be sure of your safety, put new brake discs on the Prior. Which is better to choose - we will consider further.
Varieties
Now on the shelves of stores offer two types of discs on the "Prior".
It is non-ventilated and perforated. Which brake discs on the Priora will be more effective? Let's look at each type.
Unventilated
These are the simplest brake discs that are installed on the basic equipment of Lada Priora cars. It is believed that this type has an outdated design and is almost never used on modern machines. Foreign manufacturers put unventilated disks in the distant 90s of the last century. Starting from the “zero”, even the budget class was equipped with ventilated elements.
The disk itself is a round blank with a thickness of 10 to 20 millimeters. Often it is made by casting - this is one solid element. More expensive analogues have a collapsible design. They can change the working surface. But their price is several times higher than the cost of brake discs on the Priora of a conventional cast type. The range ranges from one and a half to seven thousand rubles. The “budget” niche is occupied by just non-ventilated disks, due to its simple design.
Perforated
These elements have a more complex device. The design combines two thin metal disks with a thickness of 5 millimeters. Between them there are so-called channels through which air flows. Thanks to such ventilation, the working temperature of the disk is reduced by one and a half to two times. And as we know, during braking there is a friction force, which is converted into thermal energy. Disks need a quality heat sink.
If not, the metal will overheat. As a result, we get literally crooked discs, and possibly cracked. The braking distance is also reduced. Compared to unventilated counterparts, it is 15 percent lower. In addition, the service life of the brake pads is increased, since the
friction material no longer works at critical temperature loads.
Some facts
Perforation originally appeared on sports cars. The working part of the brake disc was drilled on special equipment. The result was through holes and grooves through which air circulated from the center to the outside. A few years later, perforation began to be used on ordinary civilian cars. But, despite such popularity, the price of such disks did not decrease at all, since the production technology remained the same. In addition, high precision work is required. At the slightest discrepancy to the standard, such a disc is rejected and does not go on sale.
About braking performance
When the pads come in contact with the disk, gases are formed (boundary layer), which interfere with good adhesion of the friction material to the working surface. Thanks to the presence of grooves, they are easily brought out. In the case of non-ventilated discs, these gases continue to slide over the metal, interfering with the normal operation of the pads. As a result, the braking distance is increased. As we have already said, the preformation reduces its length by 15 percent. Provides 100 percent adhesion between the metal disc and the working surface of the pads. In some cases, in addition to the holes, grooves are used. They have a depth of about two millimeters and are directed towards the rotation of the disk. Grooves well clean the working surface from accumulated dirt, sand and other deposits that formed there when driving a car. In the absence of perforation, this dust settles deeply on the surface of the disk. Because of this, a creaking occurs during braking. The driver cannot understand the cause of the malfunction, especially if the pads were recently replaced.
What to choose in the end?
What to put the front brake discs on the "Prior"? Reviews of motorists agree on one thing - it all depends on the driving style. If you prefer an aggressive manner, with sharp accelerations and braking, you simply need the presence of perforations and grooves. But if the car is used for a leisurely ride, there is reason to think about installing unventilated disks. A compromise option is to buy ventilated discs without perforation, but with grooves.
This is the average price range - from 3 to 5 thousand rubles per unit. So you will be sure that the system is working and ensure maximum driving safety, reducing the braking distance by several meters. Plus, if it's alloy wheels, such grooves will give your car more sportiness.
Original and fake
Now there are a huge number of fakes on the market, which are sold under the famous brands Zimmerman, ATE, Bosch and Brembo. It is easy enough to distinguish the original from the copy. This is primarily the thickness of the disk. If it is less than one centimeter, most likely in your hands is a copy. Reviews motorists recommend attention to the junction of the two parts of the disk. The inner grooves should connect to the work surface smoothly.
If there is a strict angle of 90 degrees, such discs simply crack. Well, the last factor is the price. It is two to three times lower than the original. Compare the cost of the same model at different outlets. If it is significantly different, and the disk has a different weight, a fake is sold in one of the stores.
Disassembly and installation
So, new items are bought and are waiting for installation. Installation can be done with your own hands. To do this, we need a standard set of tools.
Instruments
To install new brake discs on the Priora, we need a chisel, a jack, a spray can, a hammer, a net capacity of up to 500 ml, a screwdriver, a medical syringe, as well as a set of heads and keys for 7, 13 and 17 millimeters. The last two we will unscrew the caliper and pads.
What next?
First, we put the car on a hand brake and put backtracks back. Further, with a balloon wrench, we tear off the wheel bolts and jack the front part. We remove the wheels and unscrew the reservoir with brake fluid. Using a vacuum syringe, we pump out a part into a previously prepared container until the level in the tank drops to half. So we will exclude its hit on blocks during their dismantle. Next, we need a thick minus screwdriver. Install it between the outer brake pad and caliper and pull the piston back. It is important not to damage it - for this reason, work extremely carefully. Then we take the “13” key in our hands (you can take a horn or a ratchet) and unscrew the lower mounting bolt. If there is a locking bracket, turn it with a screwdriver or bend it with a chisel with a hammer. Using the “17” key, we press the rotary finger.
We raise the bracket, remove the pads, remove the two bolts that go to the caliper and unscrew the disk with the “7” key. Then you can put new brake discs on the "Prior". Assemble in the reverse order.
Advice
When replacing a disk, install new pads. This is a required step. When buying a disc, some manufacturers give a couple of new pads to the kit. Also observe symmetry. Suppose you have a cracked disk, and you bought one standard “for replacement”. If you put a new one only on one side, there will be an uneven distribution of braking forces and asymmetric wear. The same goes for pads. They change only in pairs. Also, when replacing, pay attention to the condition of other parts - caliper boot guides. If there are any backlash or signs of deformation / wear, replace them. After the brake discs on the Priora have been successfully installed, add fluid to the tank and pump the system. The presence of bubbles in it is unacceptable - braking on such a car becomes ineffective. The liquid just boils from air compression.
About Resource
The replacement period for this item depends on your driving style. The more often you accelerate and slow down, the lower the resource of the node. Factory brake discs installed on the Priora can withstand up to two hundred thousand kilometers. But with aggressive driving, this period can be less than one hundred thousand. If possible, slow down the transmission and switch on the “neutral” before the red traffic signal. Use more “reel” - this will not only save discs and pads (the latter change once every 25 thousand kilometers), but also increase the transmission resource. Fuel is also significantly saved.
So, we figured out how to choose the right brake pads and install them with our own hands on the Lada Priora car.