Helps heat dissipate more efficiently especially when towing. They are actually way better than non drilled rotors. I’ve never heard of the holes cracking, but we can the the chemical engineer know it all school is on brake PFA and rotors too now
HaHa. Chemistry Degree, not Chemical Engineering... I have always defended you, but dude you really have a hard time with somebody who might know more than you. I have a few more years under my belt, and have done a lot of things in my 43 years on this planet. Still think of myself as young, and keep doing things and learning.
For clarity, you NEVER talked to ZFG and asked about tuning a 15-17 Expedition on E85. The only Expedition owner other than myself that has talked to Adam in the past few days is MB. I never thought of you as a liar, but it is looking that way.
I agree with you partially on the Drilled Rotors, the cracking does not happen on quality brand drilled rotors. I have seen it a few times, mostly on tracked(Road Race, Solo) cars. Most of the time when the person put really aggressive pads, and didn’t heat cycle the rotor to bed in the pad properly.
Drilled rotors do decrease surface area, and if you don’t also improve the quality of pad under cold braking they can increase stopping distance, the inverse of that is under heavy brake load after multiple stops, they will fade MUCH less. It depends on your use case. Towing when going downhill, a drilled rotor would help keep brakes cooler if you are having to use them a fair amount like SFG said.
Some companies will put less warranty on a drilled rotor than a dimpled or slotted, because it does have a slightly greater risk of cracking. Slight, especially if a quality company.
I typically do slotted or dimpled and slotted for my street vehicles, and drilled for the track cars. That is me. Don’t currently have a Track car. My Dad is still driving Spec Miata’s at 68 and they have to be OEM like solid, so no drilled for him.
Also the whole lock up the wheel thing is BS. Almost any car can lock up wheels at lower speeds. It doesn’t mean better/more aggressive/larger brakes won’t decrease stopping distance. They get you down to lockup quicker and with modern ABS allows you to stop even quicker. There is a diminishing point of return without added grip.
Sent from my iPhone using Tapatalk Pro
I generally do not comment on 3rd Gen stuff anymore, but was asked. I will continue to post where I can provide valid good info, especially if somebody specifically asks for my input.
