Two main reasons all related to brake pad technology.ġ. Just like fitting lighter wheels, lighter brake discs bring benefits in acceleration, cornering and braking. ie brake discs are unsprung weight and it is also rotating mass. Drill brakes discs are not a lot lighter than normal brake discs but the weight is being taken from the most important part of the car. While brake pads gassing still happens, modern brake pads have reduced this problem massively.Ģ. To evacuate the gas that was produced by the brake pads when they were hot. So why do drilled brake discs exist?ĭrilled brake discs is an old technology from the 70s and 80s (I am speculating on the years so do not quote me but you get the idea)ĭrilled brake discs were developed for 2 main reasons.ġ. The best way to put a stress point in something is to drill a hole in it and brake discs are no different. In short, all drilled brake discs develop cracks the only difference is the size of the cracks which depends on how you use the discs. If you drive on track or if you put a lot of heat into the discs the cracks will be bigger. It does not matter if you only drive on the road, drilled brake discs will develop cracks. All drilled brake discs develop cracks around the holes.

I’ll cut straight to the point, you only fit drilled brake discs for looks, they bring problems with no benefits over other designs.

Slot and drill brake shop garden grove