Knowledge

Drilled & Slotted Disc Brake Rotors

Who should use drilled or slotted discs?

Anyone looking for better braking performance with a simple change from your current brake discs to genuine Jingheng brake parts with either a drilled or slotted braking surface to maximize the interaction of the brake pad to the disc.

Anyone who needs a better solution for their vehicles that are submitted to heavy braking. Anyone who has open spoke wheels and is looking for a finished racing inspired,look to their brakes.

 

What is the difference between drilled and slotted discs?

Drilled Discs will operate at a slightly cooler temperature than the slotted version disc because of the added air surface created by the drill pattern. Slotted Discs are recommended when using high performance or more aggressive pad material, or when the vehicle is submitted to extreme braking duties such as towing or hauling heavy loads. Both designs were engineered to improve pad ,bite, improve wet weather performance, continuously refresh the brake pad and prevent gas from building up between the brake pad and disc.

 

Why are there so many holes in a cross-drilled disc?

The number of holes in a cross-drilled disc is part of the engineered system. It has done extensive testing with regards to the number of holes, their size, their location and their chamfering.

It is a popular misconception that drillings in a disc determine the direction of rotation. In truth, for an internally vented drilled disc, the geometry of the vanesdictates the direction of rotation.

There are three vane types in use:

Pillar vane (comprised of many small posts)
Straight
Curved vane
The first two vane types are non-directional, and can be used on either side of the vehicle. The curved vane disc, however, is directional. A curved vane disc must beinstalled with the vanes running back from the inside to the outside diameters in the direction of rotation. Orienting the disc in the manner creates a centrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc’s ability to dissipate heat. Additionally, all of the slotted discs are directional, regardless of the vane geometry. The discs should be installed such that the end of the slot nearest the outer edge of the disc contacts the pad first.