The science behind venting/cross drilling is that brakes in effect turn energy into heat...the energy of your vehicle moving is completely converted to heat by the brakes-which is what stops your vehicle.

Since the rotors can obviously get very hot during the process, venting (or cross drilling) allows them to cool...in effect allowing more capacity to absorb more heat which means they have more capacity to stop your vehicle. If your brakes were not vented you would experience fade after repeated hard stops...fade is a result of the inability of the braking system to turn energy into heat.

Ultra high end cars and F1 race cars use ceramic rotors as these components have a much higher heat capacity than the cast iron typically found on brake systems.

 

I believe cross-drilled rotors are incompatible with off road work (mud, dirt, pebbles, etc...) so they're not really suitable for the intended purpose of a Touraeg.

johnt

 

Cross drilled rotor will not stop you quicker. It looks nice but cheaper ondes are prone to cracking near the holes. Also as said before crossdrilled rotors and off roading do not mix well either. So unless you buy expensive ones, drive max speed of the car a lot and do heavy braking, and do not go off road these rotors are not a good choice.

In that case buy an audi RS4. Much better for speedfreaks

 

1BadAssT-Rex, no more more brake war posts. Respond directly to the OP's question or do not post.

 

Ok. Thanks guys. That makes perfect sense.

 

Hi, the purpose of the cross-drilling of the brake rotor is to provide an escape path for the gasses produced, between brake pad and rotor, during a brake application. This allows better brake pad contact with the brake rotor. Look at any modern street bike or dirt bike and what do you see...cross-drilling.

I would suggest: a high temp or racing brake fluid.
braided steel brake hoses at each wheel.
get the correct combo of rotor and brake pad compound.

 

slotting is for gas release, cross drilling is for cooling. motorcycles have cross drilled brakes because they are not vertically vented (like many cars or the touareg is). the brake rotors on bikes are very thin, as unsprung weight on bikes has a HUGE impact to handling due to the gyroscopic effect. Hence the only way to add heat capacity to motorcycle brake is to cross drill. Vehicles don't have this issues (as much) and hence the best way to cool them is to put a giant piece of steel (the 350mm rotor on the touareg for instance) and cool them vertically.

When I raced motocross back in the late 80's the factory engineers would place solid discs on my bike at muddy races, this is because the cooling effect of x-drilling was outweighed by the reduced friction of getting mud stuck in the holes...so x-drilled probably isn't a good idea for any muddy offroad application.

 

You are saying gasses, between the pad and rotor, would not be released through the cross-drilled holes? Hmmm, as a motorcycle road racer, I will think on that.

 

As opposed to slotted...

As to pads, check with KVR about their carbon fiber ones. No dust, noise and excellent braking capabilities. If Brembo makes a rotor 350mm (I believe) for the V10 I'd go with that and the KVRs. Just my 2 cents.

siberian

 

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