brakes

[NICO]

i have 2006 wrx brakes front rear, what i want to no is who makes the best rotors? dba?

i whant light ones all the way around.

[jamal]

unless you spring for 2-piece rotors, which don't are available for those calipers, DBAs are actually a bit heavier. Which is good.

More rotor mass = more heat capacity.

The 4000 is their OEM equivalent, the 5000 is a step up. Rotors don't really make a difference as long as they're straight though. Holes and slots are essentially rice. I would go with Brembo or autozone blanks, but spending extra on the DBAs does provide a cooling advantage due to the fancy vane design..

[Saskatoon Subaru]

unless you spring for 2-piece rotors, which don't are available for those calipers, DBAs are actually a bit heavier. Which is good.

More rotor mass = more heat capacity.

The 4000 is their OEM equivalent, the 5000 is a step up. Rotors don't really make a difference as long as they're straight though. Holes and slots are essentially rice. I would go with Brembo or autozone blanks.

see i always thought slots and holes made it so they stayed cooler didn't heat up as quickly. Maybe its me but if a rotor heats up enough it can be damaged easier, and then there no longer straight, and there goes your only qualification for rotors, feel free to correct me if i dont know what im talking about, just my 2 censt

[jamal]

yeah, the problem is that when you have slots and especially holes is that when the rotor heats up you cause stress concentrations. Take a fancy porsche with drilled rotors, throw on some track pads and spend a day lapping, and they wiill crack.

The holes were never intended to aid cooling. They came out when pads outgassed, and would give that gas somewhere to go. The added surface area provided by them does not make up for the lost mass, and the vanes in the rotor do a much better job than holes ever could.

Slots, on the other hand, can help keep the pad clean in rally or whatever and help evacuate water. They can keep the pads from glazing over, but if you're at that stage it's the last thing you should be worried about.

[evolutionmovement]

Regular cryo treated rotors. Slots cut the pads more to keep them from glazing. That may help 'warping' since I would think it would keep glazed material from building up inconsistently on the rotor surface. I wouldn't bother with anything but standard cryo rotors. They've lasted a long damn time and worked great.

[ericem]

Would ceramic pads not glaze?

[NICO]

i just want light rotors, my stocks ones are good or should i save my money.

[jamal]

All you want is light rotors?


Get some 93 Impreza FWD brakes. They have the lightest rotors of any ej subaru.

[beatersubi]

jamal: what about cryo slotted rotors? Does the slotting not add any braking performance for track use?

[NICO]

i dont think its worth it, ya i am trying to just lose some wieght.

i am getting light rims, so i was thinking of getting light rotors as well. like dba 2 piece ones.

[Legacy777]

Nico,

To maintain your braking performance and go lighter, you need two-peice rotors. End of story. The rotors you have are the same as all the other WRX rotors, so I would believe you can find them. The rears, you may not be able to find in a two-piece setup.

As for the slotting & drilled rotors.....there are some benefits, but there are also draw-backs. I've run all of them, drilled, slotted, & blanks for quite some time and the only thing I'll be putting back on any of my cars is normal OEM rotors that have been cryo-treated. I have been amazed at how the cryo-treatment process improves rotor longevity.

[93forestpearl]

It would be sweet if someone made some WRX rotors out of aluminum metal matrix composite. We've got a 14" rotor here at school that weighs about ten pounds