It rarely happens that the car owner comes to a hundred solely for the sake of prophylactic testing of the brake system, just in case. Usually, the diagnosis is treated when a specific malfunction appears either to replace consumables — pads or brake discs. Meanwhile, the competent assessment of the state of the brakes makes it possible not only to quickly resolve a specific technical problem, but also to preventively stop the troubles in the near future with the braking system. Such an approach, on the one hand, saves a car owner, preventing the cost of more serious repair of the car in the future. On the other hand, the maintenance station thus reaches a positive reputation among customers, which in a long time provides a steady and expanding demand for its services.
Technical Specialist of TMD FRICTION Denis Dwalle
The blocks, and brake discs and brake fluid are virtually required.
When assessing the quality of the brake fluid, the following should be borne. If the TZ changed more than two years ago, another replacement should be made, because during this time the brake fluid has gained too much moisture and the risk of its boiling in intensive braking. If the biennial replacement period has not yet expired, it is necessary to check the quality of the fluid — to measure the content of water in it, relying on the real boiling point.
Most often in a hundred if they are engaged in similar procedures, the so-called «pencil» is used to measure. This is convenient, but minus such a method is that this device operates with an indirect parameter (electrical conductivity), and not directly interested in us. In the practice of the Russian office, TMD FRICTION was the case when one of the customers was ready to boast a whole batch of excellent brake brake fluid, based on the testimony of such a «pencil». And this is despite the fact that our company necessarily checks each batch of products in the factory conditions for several parameters. Therefore, the state of the TJ is more reliable to evaluate using a direct temperature measurement tester.
Thickness of the podgodnaya
As for monitoring the state of the brake pads, then everything is classically: the residual thickness of the friction lining should not be less than two millimeters. And the pads should be changed even if this parameter has not yet achieved a critical value, but there is reason to assume that it will be achieved before the next planned inspection of braking mechanisms.
The main parameter that determines the performance of the brake disc is also its thickness. The minimum allowable value is usually indicated in the original specifications. It is not scary if for some reason this information is not available. For components Textar and Nisshinbo, this parameter can be clarified in the Brakebook brand online catalog.
«Discography» by the mind
If the brake disc is thinner, or soon reaches the critical value, it should be replaced. And here there is a nuance. It is often necessary to face the fact that the current thickness of the brake disc is measured using a conventional caliper. However, to obtain objective results, it is necessary to use the «fergel» with a special design of sponges. Moreover, measuring the thickness should not be at one point of the brake disc, and in several: wear can be uneven, and our task is to determine the place with the smallest thickness.
Attention to details»
You should also check the status of other nodes and parts of the brake system, in particular, calipers. The car mechanic should be interested in their overall health, cleanliness, state of guide fingers and rubber seals. In addition, it is worth paying close attention to additional elements: all sorts of plates, springs and other «secondary» details. For example, the loss of elasticity of the spring is almost impossible to evaluate, and meanwhile, due to this, the appearance of creak or accelerated wear of pads and disks is possible. Therefore, TMD FRICTION recommends replacing such caliper details in advance.
Orchestra in the suspension
When working with the brake system, it makes sense to estimate also the condition of the suspension and steering tag — ball supports, silent blocks, sleeves, tips, etc. All these nodes are associated with brake mechanisms, pads and discs make up a single speaker system, each node of which has its own frequency response. When we change one element, it can affect the overall «sound picture.» For example, due to the «tired» silent block with new pads when braking, creak will appear. In this case, it is meaningless to sin on the pads — it is necessary to deal with the problem in the suspension, and the noise will disappear.
Disks — under the replacement
Among the recommendations to keep in mind when working with brakes, it is worth paying special attention to the replacement of brake discs. There is such a rule: when replacing the disks, there should be new pads in obligatory order, even if the old thickness of the friction layer does not yet cause complaints. The fact is that the old brake pads have a specific wear pattern on the working surface, which appears from old disks. In addition to the accelerated wear of the new part, it can also cause extraneous noise and vibrations when braking.
Be sure to check the beat of new brake discs. Each automaker recommends its permissible value of this parameter. In this regard, manufacturers of high-quality disks strictly follow the factory requirements. You should also measure the hub of the vehicle, pre-fully cleaned it to the metal. TMD Friction experts consider the value of the hub value within 0.03 mm.
After that, a new disk is assigned to the hub through spacers with wheel bolts and its beating is measured. Each automaker has its tolerance for him. Textar specialists consider the highest possible beating of 0.07 mm. Checking the total disk and hub tests in order to avoid possible trouble with brakes subsequently, because the car with «beating» brakes will be almost impossible to exploit. Moreover, the problem may not occur immediately, but after several thousand kilometers of run.
In this case, it happens that the hub is stacked in the standing ratio — and therefore does not require replacement, and the braking disc is qualitative, but the imposition of these parameters gives exceeding the established limit. Sometimes it forces it to take another disk or even change the hub. But if the design allows, you can simply rearrange the disk with a turn relative to the hub.
Developing professional skills, staff staff will be able to provide customers with a truly high level of service, so the car owner gets the opportunity to contain its car in excellent technical condition.