Warped DC2R Brakes

[DOHCVTEC]

Hey has anyone warped their stock DC2R rotors before?

If so what rotors you guys change to and on what pads?
Does it still warp?

[destrukshn]

it takes alot of effort to warp dc2r rotors.

if your braking hard, and it's like your 3rd machining, you may warp em, i warped my eg ones, but they were machiend 4 times, and i late brake, and stop from going from higher speeds than normal.

i changed mine to slotted and bosche pads, good stoppin, hasn't warped yet

[Mr_will]

Hey has anyone warped their stock DC2R rotors before?

If so what rotors you guys change to and on what pads?
Does it still warp?


there are a couple of things to avoid doing (where possible, it isnt always practical though) to prevent this from happening:

1) when you know your brakes are hot, avoid deep puddles as best you can. this is easy to say but not very easy to do. very hot brake discs getting cooled very quickly by water = warpage

2) when you know your brakes are hot, and you pull up to the lights and are stationary, use your handbrake to hold you, not the break pedal. this will prevent the front pads being in contact with the discs, which stops air flow to them, meaning the area with airflow cools at a slightly different rate, can lead to warpage

there are probably other things too, but those are the first ones that come to mind for me

[r`Geno]

What pads have you been using?

In my experience, warping has only occurred at the track. It isn't normal for the ITR rotors to warp under street driving conditions.

I've got a set of front rotors off my ITR if you need a set.

[DOHCVTEC]

hey thanks for the advice mr will

like this one tho :p



1) when you know your brakes are hot, avoid deep puddles as best you can. this is easy to say but not very easy to do. very hot brake discs getting cooled very quickly by water = warpage
there are probably other things too, but those are the first ones that come to mind for me

it kinda feels like stock brakes don't cool down very well for some reason
the brakes get a little mushy and stays that way for a while...
my rotors r like starting to warp (only really little compared to before though)
and they are on minimum thickness already so i was thinking of some aftermarket brakes
so does slotted rotors help cool down the pads apart from the cleaning that they do?

[Mr_will]

hey thanks for the advice mr will

like this one tho :p



it kinda feels like stock brakes don't cool down very well for some reason
the brakes get a little mushy and stays that way for a while...
my rotors r like starting to warp (only really little compared to before though)
and they are on minimum thickness already so i was thinking of some aftermarket brakes
so does slotted rotors help cool down the pads apart from the cleaning that they do?


no problems dude cough post quality point cough :D

to answer your other question:

its not really the pads you are trying to cool, so much as the rotors themselves.

there are two types of rotors which are designed to increase the cooling effect:

1) grooved rotors (maybe there is another name for them, i dont know). in the link i have attached, the grooves are the lines you can see. what this does is increase the surface area of the rotor, which means the air flows over a larger area, which increases the cooling effect

2) slotted/cross drilled rotors. basically rotors with holes in them. same idea, the holes mean more of the rotor is exposed for air to flow around, which makes them cool more quickly


http://www.ttzed.com/products/productimages/GD699_t.jpg

HOWEVER in both cases, contact with the pads is reduced, but its pretty commonly accepted that this trade off is worth it.

so in actual answer to your question, YES slotted or grooved rotors would help your sitatuation. youd have to be driving pretty hard on the street to be heating type r rotors up that much though.

dba make pretty good rotors, as do spoon, and mugen etc.

[Spunkymonkey]

My DC2 vtir rotors were warped when I got the car. Having said that fine once machined. I've got the dba 4000 slotted rotors on the front atm. No problems so far. Excellent braking.

[aaronng]

If your pedal is mushy when braking hard on the street, probably your brake fluid is old, contains water and thus boils at a lower temperature.

Next time on your new discs, if you feel vibration when braking, it's not warping. It's deposits because yout sat on the brakes when the discs were still hot. Do not machine them. Instead just go to 100km/h and brake hard without locking the wheels down to 20km/h. Then drive around normally for 10 minutes to let them cool down. You'll probably find that the vibration is gone.

Slotted discs don't prevent warp or deposits. But instead they prevent brake pad glazing as the slots wear down the brake pad face layer at a higher rate. That means you'll be changing your pads more often too.

Avoid cross drilled discs like the plague. Even DBA states that their DBA gold drilled brakes are not meant for track or aggressive street use. They market it as "aggressive looks". LOL! Their blanks and slotted on the otherhand are marketed as performance/track discs.

www.dba.com.au

[Mr_will]

If your pedal is mushy when braking hard on the street, probably your brake fluid is old, contains water and thus boils at a lower temperature.

Next time on your new discs, if you feel vibration when braking, it's not warping. It's deposits because yout sat on the brakes when the discs were still hot. Do not machine them. Instead just go to 100km/h and brake hard without locking the wheels down to 20km/h. Then drive around normally for 10 minutes to let them cool down. You'll probably find that the vibration is gone.

Slotted discs don't prevent warp or deposits. But instead they prevent brake pad glazing as the slots wear down the brake pad face layer at a higher rate. That means you'll be changing your pads more often too.

Avoid cross drilled discs like the plague. Even DBA states that their DBA gold drilled brakes are not meant for track or aggressive street use. They market it as "aggressive looks". LOL! Their blanks and slotted on the otherhand are marketed as performance/track discs.

www.dba.com.au


i know that you know your stuff, but why then do manufacturers such as porsche and mercedes-benz use drilled rotors on their high end performance cars?

[destrukshn]

i know that you know your stuff, but why then do manufacturers such as porsche and mercedes-benz use drilled rotors on their high end performance cars?
i guess they were designed for performance.
most aftermarket cross drilled discs, will crack under track conditions.
mate has gone through 2 sets of cross drilled rotors on the track.

though i have heard that brembo cross drills do not, apparently so.

[aaronng]

i know that you know your stuff, but why then do manufacturers such as porsche and mercedes-benz use drilled rotors on their high end performance cars?

Porsche and AMG cross-drilled discs are not drilled. They are cast with the holes in them.

Those DBA ones that you buy are drilled and WILL crack. It is not an IF. It WILL!

Brembo discs are drilled however. But they are made of high-carbon cast iron. So they expand less when heated up. Less expansion = less chance of cracking.

[Mr_will]

Porsche and AMG cross-drilled discs are not drilled. They are cast with the holes in them.

Those DBA ones that you buy are drilled and WILL crack. It is not an IF. It WILL!


makes sense...thanks

[DOHCVTEC]

hey btw r geno using stock pads
i do some track driving, just looking for some enduring brake set up realli...
i like the brake feel of the rotors and pads (when they aint hot)
just that the pads have gone hard and powdered up once, had to change them :( and rotors warp after a while...
and i heard of the DBA ones warp before too...
ill just use my current rotors till they die then hopefully i can find something that doesn't warp over time

[aaronng]

hey btw r geno using stock pads
i do some track driving, just looking for some enduring brake set up realli...
i like the brake feel of the rotors and pads (when they aint hot)
just that the pads have gone hard and powdered up once, had to change them :( and rotors warp after a while...
and i heard of the DBA ones warp before too...
ill just use my current rotors till they die then hopefully i can find something that doesn't warp over time
I'd get a set of pads just for track. Also, rotors don't warp over time if you let them cool down without holding the brake to the disc or using water. It's deposits, not warp. Are your current discs "warped"? Try the hard stop from 100km/h to clear it up. If it works, then it is deposits.