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Looks Like I Killed Another One - Autopsy Report Pls

180 wanabe
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180 wanabe Proficient

180 wanabe

Posted
Posted

Started to hear a grinding noise from the front left when I hit the breaks on my way home for work today

I suspected that the pads must have been on the ware markers or at least the front left one was, not much of a surprise as they had done 20,000k plus 3 track days

Anyhow I babied the car home as soon as I noticed the noise

thought I may as well jack the car up and pull the wheel off to have a look at what the pads were like

Pads looked like they needed to be replaced still had some meat left on them, then as I stuck my head deeper into the wheel arch to check out the side of the disc facing the inside of the car I noticed that the surface of the disc looked chewed up

I find this all a bit strange as the car had no complaints on the track day and drove around just fine for the last 3 days

post-9102-0-83387200-1352625345_thumb.jpg

PN-Mad Grand Master

PN-Mad

Posted
Posted

looks broke.

time to get it sorted. 3 track days and 20k kms is doing pretty well on a set of pads.

new pads and get the discs machined and bed the new ones back in, you'll be sorted.

180 wanabe Proficient

180 wanabe

Posted
  • Author
Posted

I found that the last time I had discs machined they worked fine on the street but were rubbish on the track just didn't seem to work as well oh and one of them cracked...

PN-Mad Grand Master

PN-Mad

Posted
Posted

were they machined below the minimum recommended thickness?

Should be fine if they are quality rotors, and have enough meat on them. But its up to you, if you want to buy new ones, buy some new rotors.

Not going to do any good trying to bed in a pad on that scratched up rotor.

PN-Mad Grand Master

PN-Mad

Posted
Posted

Def not factory because they are slotted. Don't think anybody would be bothered cutting slots in a stock rotor.

Regards machining- I *think* minimum thickness is gauged by the depth of the slot. IE- when you have worn part of the slot off, then its time to replace. If this is the case, they are fine for machining becuase the slot is still clearly visable.

81gSKy Community Regular

81gSKy

Posted
Posted

Yup I got the same thing happening, so I have to replace my front rotors soonish. I don't track this car, so I'm looking at DBA 4000 or Stoptech Power Slot or maybe Stoptech Sports Kit. Are the Stoptechs worth getting in compared to local products like DBA?

grae35 Collaborator

grae35

Posted
Posted

My front slotted rda's end up similar after a couple of hard track days.

My last ones were machined once and slots were about half worn off and still above wear limit. Unfortunately I suffer from warpage and got bad vibrations back through steering. I had to get another set and after a few 'heated' happy laps sessions on lakeside and QR they have started to go again. It is extremely important to give trhem a good cool down session before you pull up and park the car.

Unless you have the brembos our brakes are a bit light weght for track use. By the way I am using QFM A1RM pads. On my third set now.

SMOKEYV35 Mentor

SMOKEYV35

Posted
Posted

Pretty sure it's not usually possible to machine slotted rotors. A lot of people won't do it because it's really rough on the machine and breaks the carbide tips.

If you're going to be doing a few track days a year, and you're chewing through rotors at this rate - maybe it's time to look at an upgrade? There isn't really any mystery at play here - heavy car that is relatively underbraked doing hard track work is going to consume brakes. Getting arguably bettery quality rotors (stoptech) might get you a couple more laps - but i don't think it's going to be a night and day difference, nor will it change the fact that the whole package just isn't up to the task you're asking of it on a track - which means you'll probably find yourself back here again in another 20,000km's.

There is a group buy going on 6-pot calipers with floating discs for under 2k in the group by section of this forum. It might seem like a big upfront cost but you will get a benefit out of the extra stopping power - be less demanding and cause less wear and tear on your stock units, depending on how long you keep the car you might break even in a shorter amount of time than you think

Or second hand Brembos F&R can be had for around the 2k mark?

180 wanabe Proficient

180 wanabe

Posted
  • Author
Posted

Looked into the upgrade options but cant be stuffed to spend more money on the car especially with the prices V35s are selling for now :/

Pretty sure the Transgo kit was the last mod for the car

Seano350GT Veteran

Seano350GT

Posted
Posted

On the topic of rotors- my factory rotors and pads are in horrible shape, rotors have lines through them, are very glazed and beyond machining.

I've got in touch with Peter who is a vendor for RDA,

He's hooked me up with a brand new design from RDA, they are slotted and dimpled with new technology there's a few things he mentioned i can't remember.

Anyway, he's organising a set of 4 rotors + 4 EBC Red Stuff pads for the BREMBO edition, a total of $919 delivered to my door.

If anyone else is keen on this, let me know and i can arrange it through Peter. There is a 48 hour waiting time on these rotors as they are custom made for each order.

He made an ad for me on eBay, i'm not sure if you guys can see this or not but here they are.

http://www.ebay.com.au/itm/121019111709?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

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