Replacement disks on disc brakes are quite costly. The reason, this part is not as cheap as other small parts, such as lights, canvases, and gas cables. The period of replacement disk discs are also quite long.Hence, sometimes thought not to replace it. This usually happens when it gets advice from a mechanic workshop.
However, not infrequently also the suggestion is rejected outright. The reason, the visible part of the disc is fine.
"For those who do not understand, the shape of the side does look normal, but usually it starts to sound," said a mechanic in Meruya number.
The reason is that the discs run out at the edges. Then it would be useless if the sound of the brake was actually overcome by replacing the campas.
"It's useless to change the campus because it's still not fully met (between campas and discs)," he said.
How to find out that the disc is up and time is changed? Notice which side is the meeting point between the disc and the brake lining, ie the area about 3-4 cm at the edges.
Does it look like a U-width apart? If not, then the disc does not need to be replaced. But if it is berceruk, let alone deep enough, you should change it. As a result, the brakes will not work optimally and even dangerous.