Classic Audi Classifieds section Parts Wanted » Urs4/urs6 hp2 front struts and calipers????????

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Old 06-04-21, 03:15 PM   #1
audi100s4
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Default Urs4/urs6 hp2 front struts and calipers????????

My s4 has been sitting for over 5 years and im finally doing bits have managed to run her up and other than a few teething problems its nearly there I'm looking to replace my ufo brakes on my urs4 though as they have officially seen better days am looking to upgrade and am looking for struts and hubs with calipers complete ideally or any other info of upgrading these please

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Old 15-04-21, 10:02 AM   #2
audicoupeparts
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Ive a pair of HP2 calipers and carriers. will need a refurb though
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Old 16-04-21, 12:14 PM   #3
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Good stuff buddy I don't mind doing a refurb to them i would propboly regardless to be fair as doing the whole car bit by bit! Where about are you!?!? And what kinda money you looking for and have you any pics!.!?!?!

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Old 17-04-21, 04:26 AM   #4
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it's about now that I start kicking myself for not finishing my brake projects, among so many things that have slipped in the last 4 years.

HP2 setup.
The big issue is obtaining the struts. The UF struts use 3 12mm bolts to attach that huge single point inside out calliper. HP2 use 14mm. I stated looking at a conversion that was easy to do having 2 cars with UFO brakes at the time. Converting the existing strut is either easy, or a bit complex, dependent on whether you want to cowboy it, or do it with a little finesse.

UFO
The hub face on UFO disk setups is a larger diameter, and a different height (offset from the strut face). Standard disks from an HP2 won't work. The larger diameter of the hub won't fit inside the hat of the disk, and the various disk options have differing hat heights that conveniently won't centre in the calliper, or come into direct contact with the hub.
Yes, there are videos of people converting their car with a large angle grinder, and the engine running, etc. I'll not comment further, right now. Save to say that HP2 callipers aren't a straight swap. You need the whole strut from 100/A6 (C4 based) cars, which I have on two of my cars. I like HP2, but it is a heavy setup, as well.

I've read about, but not in sufficient detail to know what they did, calliper conversions using Brembo callipers. This is the project that i was embarking on when life took several unexpected detours.
In the garage, I have several callipers from the behemoth Audi/VW Q-Touareg and a couple of others. I was looking at a Mercedes disk using Brembo callipers, and a custom mount that would use the 3 point mounting of the UFO strut, and require only minimal machining.
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Old 17-04-21, 04:56 AM   #5
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Quote:
Originally Posted by Hanuman View Post
it's about now that I start kicking myself for not finishing my brake projects, among so many things that have slipped in the last 4 years.



HP2 setup.

The big issue is obtaining the struts. The UF struts use 3 12mm bolts to attach that huge single point inside out calliper. HP2 use 14mm. I stated looking at a conversion that was easy to do having 2 cars with UFO brakes at the time. Converting the existing strut is either easy, or a bit complex, dependent on whether you want to cowboy it, or do it with a little finesse.



UFO

The hub face on UFO disk setups is a larger diameter, and a different height (offset from the strut face). Standard disks from an HP2 won't work. The larger diameter of the hub won't fit inside the hat of the disk, and the various disk options have differing hat heights that conveniently won't centre in the calliper, or come into direct contact with the hub.

Yes, there are videos of people converting their car with a large angle grinder, and the engine running, etc. I'll not comment further, right now. Save to say that HP2 callipers aren't a straight swap. You need the whole strut from 100/A6 (C4 based) cars, which I have on two of my cars. I like HP2, but it is a heavy setup, as well.



I've read about, but not in sufficient detail to know what they did, calliper conversions using Brembo callipers. This is the project that i was embarking on when life took several unexpected detours.

In the garage, I have several callipers from the behemoth Audi/VW Q-Touareg and a couple of others. I was looking at a Mercedes disk using Brembo callipers, and a custom mount that would use the 3 point mounting of the UFO strut, and require only minimal machining.
I've had the same issue many a time have I been able to get hold of this brake setup and life has got in the way and now life is kind of being alright again now I can't get hold of anything that I need my project has been sat sooooo long it took a while to even get the enthusiasm to get started again on it to be fair theres a few different versions of putting brackets and calipers and disks on to ufo but I don't like the idea of having BMW this or merc that on my motor as everything else is original hence why I'm looking at trying to get hp2 complete struts /calipers so I can just do a big swap out :/

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Old 17-04-21, 11:38 AM   #6
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HP2 Callipers are fairly straight forward, although it does appear that there may be two slightly different versions, for different disc sizes. It's the struts that are the big issue. Eastern Europe/baltic states are where I've seen these most often.
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Old 17-04-21, 01:40 PM   #7
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https://www.s2forum.com/forum/techni...ton-ufo-to-hp2
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Old 17-04-21, 09:13 PM   #8
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Very good info cheers bud but want to bin the ufo off completely i think

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Old 17-04-21, 09:15 PM   #9
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HP2 Callipers are fairly straight forward, although it does appear that there may be two slightly different versions, for different disc sizes. It's the struts that are the big issue. Eastern Europe/baltic states are where I've seen these most often.
Yeh I've found this aswell i also found a few sets on german ebay a while back but shipping killed it made a front set of hp2 calipers and struts well over a grand once shipping was put on top and I didn't particularly want to spend a grand on standard brakes lol


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