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334mm disc replacement

Printed From: The W8 forum
Category: Problems, Tips and Tricks About the W8
Forum Name: Mechanics
Forum Discription: Discussions about mechanical parts of the W8, such as engine, drivetrain, brakes, etc...
URL: http://www.w8forum.dk/forum_posts.asp?TID=1861
Printed Date: 16-Dec-2017 at 21:32
Software Version: Web Wiz Forums 9.56a - http://www.webwizforums.com


Topic: 334mm disc replacement
Posted By: markw8
Subject: 334mm disc replacement
Date Posted: 05-Feb-2011 at 22:30
I'd been putting this off for as long as I could, but eventually I got around to replacing my front discs. I have the sport model with the 2FN calipers and 334mm discs. The stealer wanted £600+ for the pair and Godspeed wanted £510 to make them up specially. I then came across this site:

http://www.apecbraking.co.uk/search_size.php - Apec braking search by size

Here you can put the dimensions of your discs with a tolerance e.g +/- 2%.
Out came the discs DSK2735, for the Mercedes R129 SL320/500/600 01/99-04/02 which were very close in size:

           Passat     Mercedes
Diameter     334mm      334mm
Hub Dia       68mm       67mm
Depth/Hat     52mm     51.6mm
PCD        5x112      5x112

So I bit the bullet and bought them from Euro car parts for £71 each plus 20%tax for the original Pagid/ATE cross drilled disc for an SL500 Part No.: 104220558. I took them to a machine shop and had them machine the hub centers (67>68mm) and the wheel bolt holes drilled out to 14.3mm. I then took them to my local repair shop and had them fitted.

Costs were:

Discs      £170
Machining   £40
Fitting     £70
Total      £280.00

Note: Apec DSK2735 (ventilated only £120 a pair on Ebay)
Note: Mercedes R129 SL500 front disc on left.



I'll post some pictures of them fitted.

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W8 owner Northampton, U.K.
Passat W8 Auto, Inky Blue, SatNav, Beige Leather, Sports suspension, solar roof, parking sensors, Nokia bluetooth.

W8 - not just a light cluster for Golfs



Replies:
Posted By: RobG
Date Posted: 06-Feb-2011 at 21:35
Wow, that's quite the saving, good find.

I went with the godspeed ones, they're two piece units, so next time i just need new rotors. Will still work out more expensive than that though.

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Posted By: Manowar
Date Posted: 07-Feb-2011 at 04:35
And this rotor fits within your stock 16" Atlanta wheels?

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Manowar


Posted By: RobG
Date Posted: 07-Feb-2011 at 12:34
I think the uk spec cars with the 334mm discs all came fitted with 17" rims as standard.

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Posted By: markw8
Date Posted: 14-Feb-2011 at 21:47
Yes my car came standard with the 17" Madras rims and 334mm rotors. The best conversion if you want to upgrade to the 334mm rotors is to go with the Porsche 6 pot calipers which come with adapters for the VW hubs. You would need to fit at least 17" rims but they are worth it as at > 1800kg, the W8 takes some stopping from high speed.

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W8 owner Northampton, U.K.
Passat W8 Auto, Inky Blue, SatNav, Beige Leather, Sports suspension, solar roof, parking sensors, Nokia bluetooth.

W8 - not just a light cluster for Golfs


Posted By: gods_dad
Date Posted: 26-Sep-2011 at 15:23
Sorry to dig up an old thread, but I am guessing that these got fitted and worked fine?

I am looking to replace the discs on my W8 and having a really tough time getting them for sensible money (under £500)!


Posted By: dmcdmc
Date Posted: 26-Sep-2011 at 16:06
You needing discs as I have a pair that have very little wear that could come your way.

Alternatively Godspeed can make you some up for around £450


Posted By: gods_dad
Date Posted: 30-Sep-2011 at 14:31
I thought I would just post up my progress for anyone else coming to this thread at a later stage.

As MarkW8, I have decided to go the Merc route after finding no viable after market alternatives.

The part numbers for the Merc brakes are:
A1294212112 for the solid discs
A1294212312 for the drilled discs

The centres will need to be machined to 68mm and I will find out if the wheel nut holes need to be modified and post up. I have ordered the brakes from Merc directly at a cost of £80 plus VAT each and I hope to be able to have them machined by a pal for a crate of beer!


Posted By: mperew8
Date Posted: 30-Sep-2011 at 18:46
I tried looking but with out luck I replaced mine last year ( the larger sport model rotors) with a set from Pilenga. I thought I bought them from partsgeek.com but I couldn't find them when I looked today. Pilenga are a very good brand as well for those not familiar with them they are the people who make the brakes for Saab Aero's. After a year I've had great results from them as well and I think I only paid about $90 each too. I'd recommend looking for them before going any other route.

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-2004 W8 6spd Silverstone Grey.


Posted By: B5crazy
Date Posted: 01-Oct-2011 at 05:01
Originally posted by markw8

The best conversion if you want to upgrade to the 334mm rotors is to go with the Porsche 6 pot calipers which come with adapters for the VW hubs.


DO you have part numbers for these calipers and adapter?

TIA,

Tom

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2004 W8 Variant 6MT Pacific Blue/Grey
1992 Cabriolet
2012 Golf R 4dr CW

http://mysite.verizon.net/b5crazy/


Posted By: dmcdmc
Date Posted: 01-Oct-2011 at 09:47
I have 2 pairs of the 334mm VW twin pot calipers, but shipping to the US would be expensive I would think due to the weight. The other thing to contend with is are the hub carrier the same between the euro cars and US cars?

The euro cars have a different spacing on the caliper carrier (i.e the gap between the bolts)


Posted By: B5crazy
Date Posted: 01-Oct-2011 at 19:48
I have two rear calipers and carriers from a Phaeton I was hoping to put on my W8. Unfortunately, the bolt pattern for the carriers is different between the two cars.

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2004 W8 Variant 6MT Pacific Blue/Grey
1992 Cabriolet
2012 Golf R 4dr CW

http://mysite.verizon.net/b5crazy/


Posted By: dmcdmc
Date Posted: 01-Oct-2011 at 19:57
Yep any rear conversion needs the hub carriers drilling out to M10 as ours are M8. You also need to either take the hub carrier off to drill the holes as you can't get past the hub. Either that or grind a notch out the hub so u can get a drill past it. I will be sticking RS4 rears on mine. 324mm.


Posted By: gods_dad
Date Posted: 09-Oct-2011 at 10:52
They are on and what a massive difference!

I bought:
Drilled front SL500 discs from the Merc dealer (A1294212312)
EBC redstuff pads (DP31035C)

Here is the process for those who are interested:
(Apologies for the camera phone photos, but I forgot my digital camera)

The centre needs to be machined from 67mm to 68mm:



We cut a chamfer into it the back of the disc centre to mirror the original disc and ensure a neat fit against the hub:



We then drilled out the wheel bolt holes to 16.1mm (This is from memory so please check your originals and don’t take my word for it!):



Old and new discs:



Disc on hub and carrier mounted:



Fully rebuilt with new pads installed:



Everything bolted on just perfectly and I am very pleased with the results. As for costs:

Merc (Genuine) Front discs: £200 including tax
EBC redstuff pads (DP31035C): £100 including tax
Modifications: £50 including tax (Backhander to friend)

I was quoted £660 + 20% tax for the genuine (Solid) front VW discs and £148 + 20% tax for the genuine front pads.

I have (In my opinion) fitted better quality parts for a third of the cost so I would absolutely recommend this to anyone who is looking at replacing the front pads and discs. If you have any questions, please drop me a PM and I will try to answer.


Posted By: Jesse-B
Date Posted: 09-Oct-2011 at 11:38
i can't see the pics..


Posted By: gods_dad
Date Posted: 09-Oct-2011 at 12:02
Sorry, updated links and it should be working now...


Posted By: Jesse-B
Date Posted: 09-Oct-2011 at 12:03
got it! Nice!


Posted By: dmcdmc
Date Posted: 09-Oct-2011 at 14:26
Very good Tony

The only difference will be the weight and cooling of the disc as the originals have alloy bells and cooling channels round the centre, but for the cost difference there isn't any choice you would make other than fit the Merc ones

Shame it's only the guys in the UK that can run these


Posted By: Malcolm Tucker
Date Posted: 09-Oct-2011 at 20:56
Here's my invoice from last year for the two front brake discs and the two rear ones:



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"I've got more on my plate than a spinster at a wedding"


Posted By: markw8
Date Posted: 16-Oct-2011 at 22:37
I'm glad that people are taking advantage of this find. I used the Apec website to find the closest match to the W8 discs (search by size and you should find DSK 2735). The Mercedes cross drilled disks look great but I did notice they were heavy at 11kg each (don't drop them on your feet!).

Diameter 334mm, Width 32mm, Center 68mm, Hat Height 52mm

http://www.apecbraking.co.uk/page/2/16/brake-discs - Apec brake search

The W8 takes some slowing from high speed so you could go through a set of discs in 50k miles or so. ETKA is very useful as you can compare part numbers between VW and Audi. I've been working on the rear calipers and I've sourced the parts from the Audi Allroad 2000>. Same part numbers as W8 and available on E-bay. I sourced the rear disks from an Audi A6 and these were the 269mm ventilated genuine Audi parts for under £50.

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W8 owner Northampton, U.K.
Passat W8 Auto, Inky Blue, SatNav, Beige Leather, Sports suspension, solar roof, parking sensors, Nokia bluetooth.

W8 - not just a light cluster for Golfs


Posted By: gods_dad
Date Posted: 16-Oct-2011 at 22:46
Oh.

I just bought rear discs and pads and they were more than £50 by a fair bit! Oh well...


Posted By: dmcdmc
Date Posted: 16-Oct-2011 at 23:09
Rear discs don't do much TBH and you can buy aftermarket ones without any worries.


Posted By: markw8
Date Posted: 22-Oct-2011 at 00:34
Most cars do all the braking at the front, but as the W8 is "nose heavy", the bias is to the rear to prevent the nose from dipping in normal braking situations. In heavy braking situations, the bias is to the front. I find the rear pads wear quicker than the front. Clever people those VW engineers!

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W8 owner Northampton, U.K.
Passat W8 Auto, Inky Blue, SatNav, Beige Leather, Sports suspension, solar roof, parking sensors, Nokia bluetooth.

W8 - not just a light cluster for Golfs


Posted By: divetrucker
Date Posted: 04-Nov-2011 at 17:30
Hi,

I have been through all the options now!

The Godspeed discs are nice but they have a problem with the top hat / disc bolts touching the pads. You will need to grind a couple of mm off the inside edge of each pad to avoid this.

I have now had a set of discs made up by MTEC, using the data on this post. The discs are fine but please note that the bolt holes need to be opened out to 14.3mm from the 13.5mm size of the Merc wheel bolts. A 9/16ths drill does the job fine.

MTEC now know what to do for a W8 and sold me a pair for less than £150.


Posted By: markw8
Date Posted: 05-Nov-2011 at 00:15
I should be receiving commission for these upgrades!



Has anyone considered the Porsche 6 pot conversion to the 334mm front discs?

-------------
W8 owner Northampton, U.K.
Passat W8 Auto, Inky Blue, SatNav, Beige Leather, Sports suspension, solar roof, parking sensors, Nokia bluetooth.

W8 - not just a light cluster for Golfs


Posted By: RogerB
Date Posted: 17-Apr-2012 at 14:20
Guys, sorry to do the "holy thread revival"...but just been having a search around for a set of discs for my 2003 W8 Estate and checking the parts codes it appears that they are "handed" i.e. left side, right side. Anyone know what the causes the "handing" and are the Mercedes SL500 discs also handed????
Regards, RogerB.


Posted By: Malcolm Tucker
Date Posted: 17-Apr-2012 at 17:13
It's due to the spiral venting of the disc. The VW ones have an arrow on the bell of the wheel showing the direction it should be mounted in.

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"I've got more on my plate than a spinster at a wedding"


Posted By: RobG
Date Posted: 17-Apr-2012 at 19:20
pic of my custom made godspeed discs, you can just make out the spiral on the vents (and see the labels, ofc)



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Posted By: gods_dad
Date Posted: 17-Apr-2012 at 20:09
The Merc ones were not sided as they are drilled as opposed to grooved.


Posted By: RogerB
Date Posted: 20-Apr-2012 at 16:46
OK thats that one cleared up, thanks guys.
Been into the local dealership today for a price, £228 + vat each, oh and lots in stock at the factory!!!
Could be going down the Mercedes route.......


Posted By: gods_dad
Date Posted: 20-Apr-2012 at 16:59
I would highly recommend it. I think they are much better than the originals to be honest. The machining took not time and was very straight forward. Good luck!


Posted By: RogerB
Date Posted: 02-Jun-2012 at 07:08
For those in the UK (and Europe possibly) www.eurocarparts.com are now listing the 334mm front brake discs for our beasties, ordered a couple last night. Hopefully get them next week following the bank holiday weekend here. Also order new rears and pads as they have a 30% off discount running as well.
Part numbers for the front two are - Left 104441660, Right 104441670.


Posted By: Majorn
Date Posted: 20-Jun-2012 at 16:37
Bought these from Ebay: http://www.ebay.com/itm/370582665993?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 for $125/£80 and had them machined and fitted by a friend for a couple of bucks, beats the retail price in Sweden, $1080/£685. Hub hole from 67-68mm, wheel bolt holes from ~12mm to 14,3, Troublefree fitting.

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Objects in mirror will disappear faster then you expect.


Posted By: eddycooper
Date Posted: 08-Aug-2017 at 19:42
Looks like 3B7615302B rotors are on sale from VW right now. Check with your dealer. For example, currently $65 each at ECS.


Posted By: JayTheSnork
Date Posted: 09-Aug-2017 at 03:41
what do you have to do to fit those rotors? are new carriers required?



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