最近更新在线日韩_国产成人高清在线观看播放亚洲国产精品ⅴa在线播放_国产97视频人人做人人爱_国产做a爱一级毛片久久_一级做a爰片特黄在线观看一级_欧美日本免费_日韩视频在线一区二区三区_亚洲a∨无码天堂在线观看_一级做a爱过程免费视频_一级a爱看片免费观看,女侠被擒沦为妓女玩弄小说 ,亚洲精品无码,国产色秀视频在线播放

 

1. Marking can as soon as possible so that the brake disc due to dust and the brake friction plate produced by scribing groove dispersed into the air, so as to avoid because of the dust generated by rolling friction and improve the friction between the brake disc and a brake.
2. Punch through in brake apertures and improve the brake disc surface air flow velocity and heat transfer efficiency, avoid heat build-up, influence on the braking effect, and at the same time, the heat as much by wheel transfer to the tire, reduce risk of high temperature of the tire.
3. Punch tosecan in driving rain, because of perforated and slotted can effectively avoid the occurrence of water film lubrication, prevent braking effect weakened. On sunny days traveling can reduce air generated by the gas film, thereby improving the braking effect.
. brake disc after 500 degrees high temperature ablation treatment, eliminate internal stress, prevent in brake process due to the high temperature caused by brake disc deformation and the braking effect is reduced, and rust proof, corrosion resistance, prolong the service life