Aftermarket rotors? The OEM's suck

Cross drilled/dimpled are for cooling. Slotted is to help channel brake dust away from the rotor so that it won't build up

 

It's not hard at all. Find a good YouTube video from someone who knows what they're doing, probably could easily find one on this site. I can't imagine the brake assembly changed much, if at all, from the 2nd gen. Rotors are incredibly easy.

 

drilled rotors are fucking stupid, total marketing gimmick at this point.

All they do is make your brakes WEAKER (more prone to cracking) and they reduce the surface area of the rotor thereby also reducing performance.

10 years ago brake pad material wasn't as advanced as it is today so you could get more fade resistance by using drilled rotors, although the weaknesses listed above still applied. Today brake pad material is much more advanced and you don't even get the advantage of fade resistance until you get into the super highend carbon ceramic brakes... even then most of them don't use drilled, only slotted.

Go look at any GT racecar... none of them use drilled rotors.

Drilled rotors are only for LOOKS.

 

more to vent gas than dust IIRC.

 

Yes and no. Cheap rotors that are drilled are weaker. Rotors that are CAST with ventilation are not weaker. This is why high end cars still use the "drilled" rotors.

See Porsche 918



MB E63S AMG



BMW M4 GTS




I ran aftermarket cross drilled and slotted rotors on my c55 amg that weighed 3600 pounds and had no issues with the rotors after a half day track events that were 15 minute heats each.

 

Kind of... you're correct CAST rotors are stronger, but no one actually buys cast rotors, its always drilled which is what we're talking about here so the cast thing is kind of irrelevant but a good point nonetheless.

HOWEVER, its well known in the BMW community (which I've been a part of even longer than the Toyota world and actually sold BMWs at the largest ///M dealer in the California) that the "drilled" rotors are only around because of marketing, people expect to see holes in the high performance rotors so BMW still puts them on.... but go look at the BMW M3 GT racecar, won't see holes because their actual race car is 100% about performance not image, so they ditch the holes, same with all formula/indy/LeMans racecars, none of them use drilled or even cast rotors anymore because it doesn't provide any real racing advantage, only introduces weakness.

Again its all because of modern brakepads that don't offgas like they used to, which is a pretty recent development. So its gonna take a while before people stop associating drilled rotors with performance.

Drilled or even cast rotors are just not necessary with modern brake pad compositions, they look cool but that's it... useless on street applications, even worse on a truck.

 

Interesting, because you still the drilling on high end cars like the ferrari FXXK, porsche 918, Ford GT but on the Ford GT race car itself, they have slotted but not drilled.

I guess they give what consumers want.

 

This did in my brakes as well... I was towing my trailer down the hill...

 

modern brake pads don't gas off like old ones used to anyways, but yeah thats the main function of the holes... as the pads heat up they discharge vapor (which boils in the heat) resulting in brake fade under heavy use. i did some research when choosing my last batch of pads/rotors for my yamaha.

which brings me to my next point, want better brake performance? the pads matter! get good ones

 

So much misinformation in this thread.

 

yup, marketing. An extreme example of this is the fact that the Porsche 911 is still a rear engine car. Porsche knew by the late 70s that it was an inferior design, but by then it was already ICONIC. So to keep the classic image of the 911 they've been doing some engineering magic to make up for the rear engine, it was only until the recent 991 Carrera that they finally got rid of the snap oversteer. To remain competitive in racing they finally made a mid-engine 911 this year (the RSR) because at that level of competition they simply couldn't stick with the classic design just for the sake of being classic anymore.

 

irrelevant to the original post, but on topic for the discussion... this is how modern f1 rotors are drilled now



and heres a good read: http://oppositelock.kinja.com/brake-myths-what-to-expect-when-youre-expecting-to-st-1688020147

 

*ceramic

 

http://brembo.mycarparts.net/

 

For the record, all 911s were and continue to be delivered from the factory setup to understeer. They only oversteer when you ask them to.

Also, the new RSR is mid engine not because a mid engine platform is better. Its mid engine because for 2017 the ACO opened up the rule book to allow more aggressive use of rear aero. Hard to do when you have an engine where you want your tunnels to be.

 

I believe what he is saying is that rotors with the holes cast into them are much stronger than cast rotors that are later cross-drilled. In the former, the holes are part of the mold and the structure of the rotor is not disrupted by later drilling. This is why high end rotors that are "cross drilled" use this method of manufacture vs actual cross drilling.

None of this to be confused with venting which is what is shown on the F1 car above.

 

Most brake shutter isn’t caused by rotor warpage. It’s caused by pad desposits. The way to prevent that is good pads, and make sure you don’t heat up the brakes and then park the truck immediately.

 

I have only seen this in racing applications where the pad is designed to leave deposits that create a higher friction surface for the pad material to bite into.

In my experience, most street car shudder instances are caused by rotor run out. This can be caused by many things but is typically due to cheap ass rotors warping from heat as they wear thinner.

 

All pads are designed to leave deposits on the rotor. That’s what helps get the best bite. But when you heat up the pad and rotor and the vehicle rests too long in one spot, it will transfer too much pad material, and cause deposits.

 

interesting comment , every Porsche I've owned in past 20 years has had Drilled rotors stock, Granted the Calipers are Brembo's but I can track/AutoX my 911 with no fade, no warping, for 30K miles on set of pads and rotors. Drilled /Slotted doesn't matter?, what matters is size and how they are cooled.

The primary reason for drilled rotors is to get rid of the gas buildup between the pad and rotor, same with the slots. Are far as cool, yeah it's cool to be able to brake the car repeatedly without fade and out brake the guy next to you diving into the corner at Mid Ohio or other real track,

Not Expensive, One 911 rotor costs more than both Taco rotors even from aftermarket suppliers. As far as Drag Racing, You only have to maximum Brake one time before the Pads and Rotors cool off, Fuel (Nitro) cars TF/FC don't even have Front brakes.

The guy with the StopTech's knows what stopping power is. Also you Guys that rely on Downshifting , one thing to keep in mind, Brakes are cheaper than Transmissions and motors. Not that I don't do it ever, but I limit my usage of brake compression.
Face it , The Taco and most other Automobiles don't have enough brake capacity, Just ask any owner of a Chevy Silverado or Suburban that tows.