warped discs

[johnny5]

had my discs machined about 2 months ago and now they seem warped again or at least I think they are from the feeling I\'m getting through the steering. Does this happen alot with brembos? or is it the way I\'m braking as I\'m sure I bedded them in properly.

One thing that is goin through my head is that maybe I have reached the minimum thickness which is why they are warping in which case what is the minimum thickness? and if I need replacement discs is there much of a price difference between stock and slotted if anybody knows?

Cheers for the help

[DacerX]

i was almost at minimum thickness last time i got mine machined, and now im getting alot of feedback under braking. So just got new rotors allround

[johnny5]

New rotors it is

[DacerX]

i didnt find the price for mine that bad

[johnny5]

Ow mudge and where?

[Kiwi_Fozze]

v8 sti brembo rotors (slotted and cross drilled) from racebrakes were circa $300 when i last looked, but to be fair it WAS some 4 years ago.

[GC8E2DD]

If you are hard on your brakes and buy expensive pads, I think it works out to be more economical buying cheap BNT rotors that aren\'t slotted or drilled and replacing them more often.

[Guest]

Is it brembo front rotors you need? DBA654 is autostops part number. Ring them for a price pm me what you come up with might be able to hook a bruda up.

Like so

[table] [tr] [td]HEIGHT[/td] [td]53[/td][/tr] [tr] [td]MIN THICKNESS[/td] [td]28[/td][/tr] [tr] [td]CENTER HOLE[/td] [td]58[/td][/tr] [tr] [td]STUD[/td] [td]5[/td][/tr] [tr] [td]SOLID/VENTED[/td] [td]VENTED[/td][/tr] [tr] [td]OD[/td] [td]326[/td][/tr] [tr] [td]PCD[/td] [td]100[/td][/tr] [tr] [td]WIDTH[/td] [td]30[/td][/tr][/table]

[NotAWhiteGTB]

 johnny5 said:

had my discs machined about 2 months ago and now they seem warped again or at least I think they are from the feeling I\'m getting through the steering. Does this happen alot with brembos? or is it the way I\'m braking as I\'m sure I bedded them in properly.

One thing that is goin through my head is that maybe I have reached the minimum thickness which is why they are warping in which case what is the minimum thickness? and if I need replacement discs is there much of a price difference between stock and slotted if anybody knows?

Cheers for the help

You warp you rotors from getting them hot and not letting them cool down evenly. The biggest cause of this is if brake heavily and get them hot, then park your car up.

The reason for this is under heavy braking your caliper and rotor gets hot, but calipers don\'t cool as fast as rotors. So when you park up, the part of the rotor where the caliper is, takes longer to cool down than the rest of the exposed rotor, and uneven cooling of the rotor, distorts it shape making them warped. This is why at the track you see everyone pushing there cars backwards and forwards in the pits after a hard outing using the brakes.

The main purpose for slots on rotors is to remove the gas from between the pad and rotor under extreme braking. Getting slotted rotors will not help your rotors in been less prone to becoming warped. Things that cool your rotors faster are venting and cross drilled.

Moral of the story, if your getting your brakes hot from heavy braking, keep driving for another 5 minutes or so, going easy on your brakes and give them a chance to have a good cool down before you stop.

[loner]

Make sure you torque your wheels nuts correctly... tighten them in a star pattern as well. Use 70 ft/lbs.

[johnny5]

 evowrx said:

Is it brembo front rotors you need? DBA654 is autostops part number. Ring them for a price pm me what you come up with might be able to hook a bruda up.

Like so

[table] [tr] [td]HEIGHT[/td] [td]53[/td][/tr] [tr] [td]MIN THICKNESS[/td] [td]28[/td][/tr] [tr] [td]CENTER HOLE[/td] [td]58[/td][/tr] [tr] [td]STUD[/td] [td]5[/td][/tr] [tr] [td]SOLID/VENTED[/td] [td]VENTED[/td][/tr] [tr] [td]OD[/td] [td]326[/td][/tr] [tr] [td]PCD[/td] [td]100[/td][/tr] [tr] [td]WIDTH[/td] [td]30[/td][/tr][/table]

cheers bro will do

[johnny5]

 NotAWhiteGTB']

[quote name='johnny5 said:

had my discs machined about 2 months ago and now they seem warped again or at least I think they are from the feeling I\'m getting through the steering. Does this happen alot with brembos? or is it the way I\'m braking as I\'m sure I bedded them in properly.

One thing that is goin through my head is that maybe I have reached the minimum thickness which is why they are warping in which case what is the minimum thickness? and if I need replacement discs is there much of a price difference between stock and slotted if anybody knows?

Cheers for the help

/quote]

You warp you rotors from getting them hot and not letting them cool down evenly. The biggest cause of this is if brake heavily and get them hot, then park your car up.

The reason for this is under heavy braking your caliper and rotor gets hot, but calipers don\'t cool as fast as rotors. So when you park up, the part of the rotor where the caliper is, takes longer to cool down than the rest of the exposed rotor, and uneven cooling of the rotor, distorts it shape making them warped. This is why at the track you see everyone pushing there cars backwards and forwards in the pits after a hard outing using the brakes.

The main purpose for slots on rotors is to remove the gas from between the pad and rotor under extreme braking. Getting slotted rotors will not help your rotors in been less prone to becoming warped. Things that cool your rotors faster are venting and cross drilled.

Moral of the story, if your getting your brakes hot from heavy braking, keep driving for another 5 minutes or so, going easy on your brakes and give them a chance to have a good cool down before you stop.

thanks for the info I usually take the car up hunua rd once a month its pretty twisty so might explain it a bit