Brake Disc – With grooves instead of cooling holes
Brake Disc – With grooves instead of cooling holes
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Discussion

Swiss_Toni

Original Poster:

412 posts

206 months

Tuesday 27th March 2012
quotequote all
Might anyone know where to get replacement (AP) front discs/rotors with grooves instead of cooling holes?

Barring that does anyone have the part number of the original discs so I can research it?

Any suggestion where to buy them would also be helpful.

Thanks

MarkWebb

983 posts

240 months

Tuesday 27th March 2012
quotequote all
I have emailed what I have to you Greg

bluesatin

3,115 posts

295 months

Tuesday 27th March 2012
quotequote all
Can you share this please- I know the discs are specific to Ultima but you can get micro cracks after hard use (all drilled do that). Alternative would be useful.

Swiss_Toni

Original Poster:

412 posts

206 months

Tuesday 27th March 2012
quotequote all
No problem, once I have the info (someone is checking on it already), I'll post what I find.

k wright

1,039 posts

282 months

Wednesday 28th March 2012
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Is this true? The discs are specific to our car.

Amazing if true.

Stig

11,823 posts

307 months

Wednesday 28th March 2012
quotequote all
k wright said:
Is this true? The discs are specific to our car.

Amazing if true.
'tis true. I think Bluesatin has the AP part numbers but AFAIK they do not relate to any other vehicle?

hedgefinder

3,418 posts

193 months

Wednesday 28th March 2012
quotequote all
yip true

DHGTR

1,196 posts

266 months

Wednesday 28th March 2012
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I went to the AP factory (fairly local) a few years back and they also confirmed it.

Steve_D

13,801 posts

281 months

Wednesday 28th March 2012
quotequote all
It is my understanding the Factory have a purchase agreement with AP which resulted in the unique part numbers. AP will not sell to anyone but the factory. Makes perfect sense from the Factory perspective as it maintains their ongoing sales.

I'm sure a carefull study of the AP catalogue will find you a perfectly acceptable alternative particularly if you want to move away from the drilled version.

Steve

macgtech

997 posts

182 months

Wednesday 28th March 2012
quotequote all
I think you may struggle as both the thickness and diameter are fairly unique - and the mounting PCD is non-standard too.

d3dna

395 posts

251 months

Sunday 1st April 2012
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I can ask my mate who works at AP, if you can provide the relevant specs I will send him a text and see what he says.

Swiss_Toni

Original Poster:

412 posts

206 months

Sunday 1st April 2012
quotequote all
I've got the specs and part numbers (thanks to Mark), it's just a case of seeing if grooved ones are available.

I'll chase things up to see what the story is.

harry b

329 posts

197 months

Monday 2nd April 2012
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You can just call AP. They have always been very helpfull in my case dealing with old race and rally cars.

Swiss_Toni

Original Poster:

412 posts

206 months

Thursday 5th April 2012
quotequote all
So here is what I’ve got.

So the answer is yes grooved discs are available from AP.

They would be 8 grooves on each face, the price would be £225.49+vat+shipping each, delivery time once the order has been received is 7 to 8 weeks (could be a bit less). The kicker would be that a minimum order of 10 pairs (20 discs or 5 car sets) is required. There MAY be also discount available, though we’ll have to see.

For comparison the standard cross drilled ones are £249+vat+shipping each which are either on stock or 2 week lead-time depending who you order them from.

The base part number that I’ve been given is CP3580-1048 & 1049 (the different dash numbers are for Right or Left), I also have drawing so if the person I got it from doesn’t mind I could post that as well. if it would help. We would need to triple check this number before we go any further (my car is not here for me to check).

In the end if there is sufficient interest an order could be made. I’m interested in 2 pairs (4 discs). Anyone else?

I guess the best way is to PM your interest (no promise), possible quantities and we can see if get enough for a “club” order.

Davrianman

487 posts

287 months

Friday 6th April 2012
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What's the advantage in using groved discs rather than holes for cooling?

bluesatin

3,115 posts

295 months

Friday 6th April 2012
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Groves dont crack after heavy use. This is not a fault or problem but all drilled discs if used hard will eventually start showing cracks- ask any 911 turbo owner that has driven hard!

For Ultima owners this is not really a big problem unless you use your car on track a lot ot do very high speed braking.

AlexCim

156 posts

177 months

Saturday 7th April 2012
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I'd consider taking 6 pairs. Need to send them to Australia though...guess I could just throw it in with the next GTR coming to Australia as I have no immediate need for them really.

We are talking just the discs right, no hats?

Swiss_Toni

Original Poster:

412 posts

206 months

Sunday 8th April 2012
quotequote all
Great we have 8 pairs so we would need 2 more pairs for the mimium (there is no maximum).

Yes it is just the disc/rotor not the including the bell/hat.

We do really need to double check the base part number to make sure we order the correct parts. Would anyone have some new ones lying around to double check the part number?

The non-cross drill discs don't crack and warp like cross drilled ones even with moderate use. They also have more surface area for more braking proformance. Cross drilling is a bit old fashion as most race cars on steel brakes have grooved discs.

k wright

1,039 posts

282 months

Sunday 8th April 2012
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Ask them to price the carbon discs. They are 1300.00 USD for the Corvette.

Swiss_Toni

Original Poster:

412 posts

206 months

Monday 9th April 2012
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I'll ask about carbon discs though I would have thought you need different calipars as the carbon disc tend to be a lot thicker.

It would be really great if someone could confirm the part number as we now have more than enough for the a mimium order.