I30n brakes

[kh217]

Hi all.

Just got my i30n performance 2019 in for a warrenty reason. Main dealer did a visual health check complimentary. They have stated that my front disks are below minimum thickness requirement (26.68mm) think minimum is 28mm.
What I don't understand is these disks were changed about 3 month's ago round 3k. Yet they are telling my I need new ones.

After visual inspection they don't even have a lip around the outer edge on them. Basically look brand new.

Are hyundai trying to mug me off. Do I need to be worried about less break performance or piston travel. ?

Only reason I ask is I have never owned a car where the minimum thickness is this high on a break disc. Never been highlighted from main dealers. I.e bmw.
Always had disks that are for example 70% worn but still deemed safe on other cars


Many thanks

 

[Jajodu]

If there's no wear lip I'd say they're trying to mug you.

 

[Nthusiast69]

I guess it never hurts to get a second opinion at another impartial garage if possible, or if someone on here who replaces their brakes themselves can chip in.

I find myself in a similar position coming up to my 5th service, ~46k miles (MY20 PFL) with original pads and discs (from new / buying the car). I'm very impressed they have lasted this long and I'm keen to replace again with OEM parts if I can figure out what they are, and, without paying the £620 I've been quoted from my local Hyundai garage. The front discs do have a distinct lip which I will measure how tall they are with a vernier caliper later today, as I want to make an informed decision going into the garage for my service in a month.

From what I have researched myself, it seems that new discs are 300mm in diameter, 30mm thick, and minimum thickness is 28mm. If I understand correctly, that means we have 2mm of use before needing to replace the discs. As for pads, it seems theres still a lot of life in the pads still, so I might be looking at just discs for now.

I thought I'd chime in, as 3 months of use on new discs before replacing again certainly doesnt sound quite right. How hard do you brake? Do you mainly do road driving or do you exclusively take it to the track? Are your discs OEM or some other aftermarket ones? If so, do you mind sharing what you have?

 

[Jajodu]

Disks for the performance model are 345mm diameter. I used blueprint disks and pads, go to bilstein partsfinder and get the part no's and then do a Google search. Pads about £70 and disks about £100. These are very good items and nearly all independent garages use blueprint parts. Pads part no ADG042189

 

[Nthusiast69]

Thats my mistake on the diameter size, it is the performance model, not the 250HP one; I was just going off of an online parts tool. Its a shame that Hyundai doesn't share the details in the owners manual for consumables except oil / filters, it would have been especially useful to know what the torque specs are if you were to replace yourself.

Thanks for those part numbers, I'll carry on with my research!

 

[Nthusiast69]

I wanted to report back on my half a day research in case it benefits anyone. I would agree with Jajodu, if the discs are worn there would be a physical lip on them which you can feel when you run your fingers over. If there is no lip, and given your discs are not warped, go to another garage for some peace of mind and then forget about it.

For some perspective, I managed to take some measurements of my front discs, at the edge where the lip is most pronounced from the rest of the disc rotor material, with wear across both in the range of about ~1.60 to 1.70mm after almost 5 years of use and 46k miles from new. In my non-expert opinion, I am due a change in the next couple of months and started looking for replacement parts, as the quoted £620 sounds like a right ripoff from the dealer I purchased the car.

From another dealer I managed to get a quote, and more importantly part numbers for the fronts, which I will happily share below should anyone wish to google them and get genuine replacement parts.

Part No's for MY2020 i30N Performance Prefacelift:
Front Brake Disc P/N: 51712S0100 (packed individually)
Front Pads P/N: 58101S0A10

Pricings online for the genuine Hyundai front pad kit is £230 and the discs are £88 each (incl VAT), so I can see how the garage ends up at such a high price when they add the labour and significant profit margin.

Instead, I might try the BluePrint discs (P/N: ADG043246) and pads (P/N: ADG042189), which are £101 and £31 respectively, as Jajodu recommended.