Brake discs for 370 mm “sub 8 package” on a Leon Cupra R 2018.

[TheSwede]

Hi all.

I experience pulsating during braking that increases with the temperature of the brakes. The pulsation has become worse since my last track day the other week.

I have the oem SHW 370 mm discs Item no 8J0615301K. They are rather expensive so I considered buying Zimmermann Item no 100.3367.70 instead since they are cheaper. Looks similar. I will order them from Germany, far better prices there compared to Sweden where I live!

Pads. Last time i bought Ferodo FDS1334 pads. They suit me well because I use the car mostly on ordinary roads but sometimes on track days.

My question - Are the Zimmerman discs a good alternative?

Btw, my SHW discs are since the car was new.

/Peter

A pic from a wheel rotation back to front today

 

[SuperV8]

Do you have a better/closer photo of each disc?
If you have a brake pulsation following a track day (high brake temps) I would suggest you have uneven friction material transfer.
When the pad friction is above it's 'happy' working temperture it can start to unevenly transfer onto the disc (causing a thick area) - especially if parked with brake on without any cooling laps?

Before spending money, I would try re-bedding in your brakes, 10 repeat snubs from about 60mph to 20mph (do not come to a stop whilst doing this) and fairly firm braking, around 50% of an ABS level stop. After you have done 10, drive normally to allow your brakes to cool, this can sometimes help remove thick uneven material transfered spots.

If you have a 25-50 micrometer (0.001mm) you can measure your disc thickness variation (DTV). Measure around the circumference of your discs, if you have one 'think' and/or one 'thin' spot it could be just DTV from normal use (more likley to happen from lots of motorway use), if you have more/random 'thick' spots you probabbly have uneven friction material transfer.

 

[TheSwede]

@SuperV8

Thanks for the answer.

I am familiar with “material transfer” during track use. Had it first on this car with the oem Pagid pads, then I changed to Brembo “vanilla” version same problem with material transfer. I have by hand (no machine) sanded the right disc with 240 grit after I detected blackish pads material. (Right - sitting in the car). Since the discs are identical R/L the right one seems to be hottest. The last 2 years I have used the Street/Track pads Ferodo 1334, much better. I haven’t detected any material from them on the discs, therefore I don’t think I have this problem for the moment.

I suspect if I had a Micrometer and measured the disc there would be differences in thickness as you describe. Perhaps the disc is floating uneven on the “pins” when it warms up?

I will use the car some time, without doing anything, and see if adjusts itself, wishful thinking ! If not better, perhaps the Zimmermann could be an alternative...if they are good enough.

PS I also use the RS3 Brake cooling ducts.

Se attached pics from today without flash and with flash .

 

[TheSwede]

I will also practise the 10 brake snubs as you recommend. I have done some heavy braking from fast to slow to see I it adjusts the problem, but not so many.

/Peter

 

[tracktoy]

Have you checked wheel barings

 

[TheSwede]

It was in for the yearly Swedish MOT some weeks ago. Everything was ok then but I will check if there are any space/play.

EDIT Checked the wheel bearings, ok.

Did also the 10 cycle braking, perhaps better, got rid of old tire debris from the track also .

 

[TheSwede]

I had forgotten about this old tread below, much “talk” about SHW discs vs Zimmermann discs.

Brake pads options for 370mm Brembo 4 pots

Hi all, Im having a nightmare trying to find the specific part numbers for replacement pads on my R ST that comes with the 370mm disc and Brembo 4pot calipers. Ideally I’d like Ferrodo DS Performance or DS2500 but I don’t know which ones to get ? Eg the specific part number Alternatively...

www.seatcupra.net

 

[TheSwede]

Following up the subject 370 mm discs.

Last week I ordered new discs, Zimmermann 100.3367.70 and pads Ferodo FCP1334H (DS2500). I have put them on today, works great so far!
The car have been resting in a garage since middle of November so not much have happened with it until today when I activated the registration/ insurance.
The hubs were very fresh, just used a small steel brush to clean them. 36000 km on the odo now, no winter use .

 

[SuperV8]

Wow - hub/knuckle looks very clean - like new!

 

[TheSwede]

Yes ! The car is stored in a garage 98% of the time. It is not exposed to water except for car washes . Only drove one winter season when it was new in 2018/19.

 

[nd-photo.nl]

Looking very good

 

[Pricey_Jnr]

I have recently put the zimmermanns on the front and rears of my Leon Cupra R ST myself after brake judder from the rears (my own fault for not letting them cool enough before using the handbrake) I went with the Pagid Street+ pads.

I thought I was being clever and also ordered from Germany, but got stung by customs to the UK
I'm still in the 'plenty of light braking' phase after the initial bedding in 180 miles so far, so I'm eager to see how well they pair up.

How many miles have you done on the zimmermanns? And how to you rate the pairing with Ferodo pads so far?





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[TheSwede]

I have only used the car for 2 days last week with the new front brakes. I am now on ski holiday.
The paring Zimmermann discs and Ferodo FCP1334H pads feels great so far.
BTW i ordered my set + other parts from Estonia, Aeromotors in Tallin. Swedish vat no Customs fees (within EU). Great delivery time, less than a week.