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Vented and slotted are not the same thing you blokes.
Most modern brakedisks are vented, certainly all VR6 ones are.
This means there is an airgap between the two faces of the disk to aid cooling.
Slotted means they have grooves cut into the face of the disk to help dissapate heat. I reckon this also wears the pads quicker.
The 6n polo , golf cl and audi a4 1.8 non turbo used solid discs . And some of the t4s did as well .
The reason why ventilated discs have improved efficiency over solid discs is the extra surface area of discs to dissipate heat . The air gap doesnt do much in terms of cooling since there is little direct airflow into the disc .
Slotted discs are there to prevent the gas build up between the pad and disc which causes the actual pads to crack . It wears out the pad quicker due to its harsh edges that cut into the pad when braking hard . It does however save the disc from damage under extreme braking .
Quote:
Originally Posted by Golf Loon
easiest way to tell which brakes u have is to measure the thickeness. The 288m setup ones should be around 25mm thick. i think the earlier ones are about 22mm or something
Hawk HPS & HP + are very good all round pads.