This is something i've wondered about for a while, so i thought i'd ask the PF massive their opinions.

Right, on like likes say new high powered Audis/BMWs you get big brakes, say again for the sake of arguement 330mm 4 pots. Now if you were to compare the OE brakes to say AP's of the same size, i notice one major difference, there is a bigger pad to disc contact area on the OE brakes? Why do the likes of AP not do this? Is it simply because the bell has to take up a certain amount of room before the rotor part can start?

 

i think you may find mate, thats its the other way round. the brembos i just fitted from an evo 8, the pads are longer, and wider so cover much more disc area than the std 2wd pads do

 

i think you may find mate, thats its the other way round. the brembos i just fitted from an evo 8, the pads are longer, and wider so cover much more disc area than the std 2wd pads do

 

Thats exactly my point lol - OE Evo brakes have a large pad contact area, whereas an AP kit using bells has a smaller one?

 

I can see what you mean if the AP discs are NO larger than the std size brakes.
The main point changing from a solid cast disc to bell/disc of the same overall diameter.

 

The same amount of force applied over a smaller surface area should still equate to the same amount of stopping power. Only downside/upside i can see is accelerated pad wear/quicker heat up times?

 

service life of the pad is a large reason why!

 

AP racing kit for Evo has much larger pads then standard Evo brakes. I can have guys from the werehouse make pictures of both pads if you want. Pad life is also much longer. We went through a dozen of pads sets and brake kits on our company Evo this year so I know a bit.

 

So are we comparing road kits to racing kits ?

 

What I ment is Formula fast Road AP Racing kits as comapred to standard brembo discs.


I have experience of Brembos on std discs, AP strap drive discs, AP 330mm and 362mm kits, and Brembo Grp.N 355mm kit.

Only on Grp.N kit the pads is quite small but this is due to fittment of huge 355mm disc under 17'' wheels. It is still bigger then std 328mm Brembos I think.

 

Question wasn't for you Jakub

Plenty people dont even realise there are road calipers and racing calipers within the same range.

 

LOL, I know. I talked to AP about this when choosing calipers for our racing car. They say road models are good for racing unless there is extreme brake load involved (e.g. very heavy car and endurance racing).

 

Yes i am! I know its not really correct, i was just wondering why AP etc have a narrower pad than some oe kits.

But i have my answers now