morning all wonder if anyone can help. had a search but cant really find an answer. ive recently got a pair of 312mm carriers and calipers and just need a set of discs/pads. im probably going to just go for OEM bits but was wondering if OEM pads would be ok to use with drilled/grooved discs. might be a daft question but any help is greatly appreciated

Yes they'd be fine to use but I see no need for grooved discs. Just buy some OEM 312's and save some ££

I'm running standard size disks but they are drilled, grooved and vented. Stops better than stock

All new discs now are vented lol. Some say grooved reduces the life of pads, as they cut the pad/refresh the surface

I know they're all vented lol :P

Yeah, the grooves do cut pads quicker but also help to reduce brake fade, dissapate heat and get rid of any unwanted water/cr@p on the disks

The choice is yours. I've never had any fade on the standard 312's. The 288's though are a different story

I must admit i did with standard disks, then uprated them to the DRILLED AND GROOVED(:P) ones and its considerable reduced

Like has been said in other posts - stock 312mm discs should be fine. Just buy some good quality ones - I bought Brembo discs from GSF as i've found them good in the past.

I know they're all vented lol :P

Yeah, the grooves do cut pads quicker but also help to reduce brake fade, dissapate heat and get rid of any unwanted water/cr@p on the disks

Always wondered about this theory.

How exactly does reducing the surface area of a disc surface by cutting and drilling bits out of it dissabpate heat? surely the reduced surface area of the disc will increase the friction needed to attain the same level of stopping power as the pad is biting down on a smaller area?

I understand the concept of what the grooves and holes do but the theory of what Dovit said just doesnt ring true to my mind.

All i know is that it stops better than it did on standard disks.

All i know is that it stops better than it did on standard disks.

fair enough. i wasnt trying to proove you wrong just using your musings to get my point accross.

I started wondering about this a couple of years ago when I gave bike racing a go. When asking about the best brake set up i was told to use the 'wavey' discs as they work better but to mind they have a smaller surface area being braked against with the pad so you would need more pressure on the disc to gett he same braking effect.

I'm running standard size disks but they are drilled, grooved and vented. Stops better than stock

Hope they were heat treated again properly after they had been drilled and grooved. Also drilling them is going to lead to weak spots.

I doubt very much the OEM discs that somebody grooved and drilled will be strong and I'd think that at some point you might well find cracks around the holes or worse issues caused by heat along the length of a groove etc.

Hope they were heat treated again properly after they had been drilled and grooved. Also drilling them is going to lead to weak spots.

I doubt very much the OEM discs that somebody grooved and drilled will be strong and I'd think that at some point you might well find cracks around the holes or worse issues caused by heat along the length of a groove etc.

Eh, never said i drilled and grooved them myself.

Bought from a company and i have no cracks etc on ANY of the disks

Im running grooved with OE pads... all good here... keep the pads from glazing over

If they were glazed over then they have got too hot, hence face etc.

I see no point in grooved disks. If they are used properly then they shouldn't defect

I just got these yesterday for my 312 calipers and carriers:

I see you have gone for plain vented discs. Grooved and dimpled/drilled discs look good and are probably better during track days for keeping things cool. My father has EBC's Turbo Grooved Discs on his car (Scooby Impreza). These are Groved and Dimpled. Dimpled ones are far less likly to crack than drilled ones. The only problem with them is they are very NOISY during Medium to Hard braking, which puts me off. EBC have now produce Black Ultimax slotted discs which are said to be better than OEM and just as quiet. The only problem with them and TGD's are they are twice the price as standard ones.

grooved/drilled/dimpled etc...all for show...simple as

By grooving and drilling the surface of a disc you increase the surface area, if you have a flat surface say 3mm x 3mm then drill/dimple the same area because you now have a dome you have increased surface area

grooved/drilled/dimpled etc...all for show...simple as

dont talk wet

By grooving and drilling the surface of a disc you increase the surface area, if you have a flat surface say 3mm x 3mm then drill/dimple the same area because you now have a dome you have increased surface area

Not quite correct if we talk about surface area contact with the pad

Exactly a grooved and drilled disc will increase surface area tehcnically which will aid cooling(minimally!) but the reduced surface area in contact with the pad will mean more heat due to friction is created as the reduced pad contact area means more pressure is needed for the same braking effect.

99 times out of 100 any perceived extra braking capabilty is nothing more than in the mind.

Also under heavy braking you get a gas build-up between the surface of the pad and the surface of the disc - the grooves help to expel this gas and thus help you reduce the fading effect caused by this issue.

The only thing I find is because you can keep your foot on it for longer, you inevitably get the discs hotter, which in turn ends up warping the discs.

Bigger is better as they say!!