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Old 3rd November 2013, 08:40 PM   #1 (permalink)
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Brake upgrade: R35 Brembo Calipers and Discs

Although there are some pictures of my recent R35 brake upgrade in the projects section, I thought I would do a detailed write up on what is involved in fitting this kit. One thing to bear in mind with this kit as the discs are 380mm front and rear at minimum you will need 18" wheels to clear the calipers more critical at the front. I am running 18x9.5 et30 Rota GTR wheels, but require a 5mm spacer to clear the wheel, with 10mm being ideal. better still if you have et 20 wheels in this range you should be.

Assuming you have bought a kit comprising of front and rear R35 calipers and discs, you will need the following items:

1. Front and rear caliper mounting brackets: You will need two for front and two for rear.



2. A steel ring to accommodate the smaller hand brake shoe diameter of 172mm. 190mm for the R35.

Pictures to follow later:

I went with a 14mm front bolt setup as I had previously drilled the hub carrier to fit R34 Brembo calipers.

To fit the front brackets and due to the sheer size of them approx 10.5" in length, you will need to trim this mount (which is used for the bracket that holds the hard pipe brake line) as well as the shield/backing plate.

See below: (Excuse the scrappy line)



Fully trimmed:



Test fit of bracket which fits nicely in place.



The caliper also fits well.



Before mounting the disc, make sure the hub surface and inside of the disc that mounts on to the hub is clean and flat with no grit or rust to ensure once fitted the disc rotates true with minimal run out as specified by manufacturer. I also had my discs skimmed, these are an interim solution and will later for for either Alcon or AP replacements.

With the disc fitted on:



And the rear view of the caliper. You will be able to use your existing hard pipe and braided brake line.



So that is all that needs to be done to fit the fronts which is pretty straight forward with minimal cutting/trimming involved.
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Old 3rd November 2013, 11:13 PM   #2 (permalink)
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Well done, great wrote up. Thank you. Have you tested with only the fronts installed, how do they stand up against the factory R34 brakes?

Waiting for you to install the rears so we have both write ups with photos.
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Old 3rd November 2013, 11:22 PM   #3 (permalink)
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Great post, hope you'll also bring some pics for the rear installation
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Old 4th November 2013, 07:07 AM   #4 (permalink)
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Well done chap good write up hopefully this will inspire more to take advantage of this setup!
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Old 4th November 2013, 11:57 AM   #5 (permalink)
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Quote:
Originally Posted by xxfr View Post
Well done, great wrote up. Thank you. Have you tested with only the fronts installed, how do they stand up against the factory R34 brakes?

Waiting for you to install the rears so we have both write ups with photos.
I posted my overall impression a few weeks ago, but cannot remember where now.

The difference is huge, initial bite was much more compared to my old R34 brembos but having also fitted a BM57 I am sure this helped a great deal. As for brake balance I carried out a fair bit of trail braking into corners, by doing so you can easily tell where the brake bias is, the car went in as it should right to the fictitious apex. Braking in a straight line you could feel the car pulling square on all for wheels. There are some pictures of the rear fitted on my projects thread: https://www.gtr.co.uk/forum/196881-be...ml#post2114066
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Old 4th November 2013, 12:11 PM   #6 (permalink)
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Don't know whether I'd be too happy cutting off part of the hub carrier? Other than that it looks great!
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Old 4th November 2013, 12:14 PM   #7 (permalink)
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it serves no purpose other than holding a small bracket for the hard brake line. You would need to make huge compromises on bracket design and strength if that was still in place, the brackets are huge to fully support fitment of the caliper which is also huge.
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Old 4th November 2013, 07:50 PM   #8 (permalink)
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Fitting the rear was more of less the same as the fronts, with the lip that folds over on the brake disc shield needs cutting off. I will at some point take it right off so only the hand brake backing plate will remain.

Bracket fitted:



Showing the lip trimmed off.




Disc and caliper fitted







I will post pictures of the steel ring for the correct functioning of the hand brake as soon as it is fitted.
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Old 4th November 2013, 07:50 PM   #9 (permalink)
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Quote:
Originally Posted by FRRACER View Post
it serves no purpose other than holding a small bracket for the hard brake line. You would need to make huge compromises on bracket design and strength if that was still in place, the brackets are huge to fully support fitment of the caliper which is also huge.
Totally agreed, the small bit serves no structural purpose.

I highly appreciate your write and the time you have taken to do it. I would to request if you could also do something similar for the rears as it is the one everyone is a little confused about. Thanks chap.
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Old 5th November 2013, 08:27 PM   #10 (permalink)
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See above
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Old 6th November 2013, 07:37 AM   #11 (permalink)
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What size diameter is the steel ring of the R35 rears? I know the R34 uses 172mm diameter.
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Old 6th November 2013, 10:17 AM   #12 (permalink)
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OD 190mm with ID of 172mm bolted in rather than welded. I believe AP and Alcon kits use the same proces of having an alloy bell with a steel ring for the hand brake.
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Old 6th November 2013, 10:40 AM   #13 (permalink)
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If the ID is 172mm for the R35 brakes why do you need to fit a steel ring for correct functioning, as you you stated below your last pic of the rear setup?

Sorry just need to make sure I understand what you are saying.
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Old 6th November 2013, 10:53 AM   #14 (permalink)
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Let me explain again, the R35 inner drum diameter is 190mm, the R34/33/32 is 172mm.

The steel ring needs to have an 18mm of thickness, so when you fit it inside a 190mm R35 drum, you will then get an internal diameter of 172 so the R34/33/32 brakes would be with in spec.
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Old 6th November 2013, 09:23 PM   #15 (permalink)
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190mm - 172mm = 18mm

18mm : 2 = 9mm

Ring with 190mm diameter and 9mm thickness
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Old 6th November 2013, 09:29 PM   #16 (permalink)
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Lol yes school boy error my bad

Quote:
Originally Posted by Fuzzy View Post
190mm - 172mm = 18mm

18mm : 2 = 9mm

Ring with 190mm diameter and 9mm thickness
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Old 9th November 2013, 06:33 AM   #17 (permalink)
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What did You do with the brake lines?
Used the original ones?
Use braided ones? If so, for which car (32 or 35)?

Cheers,
RoB
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Old 9th November 2013, 01:24 PM   #18 (permalink)
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Quote:
Originally Posted by dA_RoB View Post
What did You do with the brake lines?
Used the original ones?
Use braided ones? If so, for which car (32 or 35)?

Cheers,
RoB
As far as I know you can use the OEM lines, maybe someone can confirm.

If so I have an like new set of Nismo braided lines lying in my gargae if you like

You can give them a try, if it doesn't work out, then just return them to me

We can discuss end November when I'm back home

Cheers,

Leo
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Old 9th November 2013, 02:06 PM   #19 (permalink)
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Hi Leo,

You'll get a mail in few minutes!

I'm still interessted in FRRACERs solution

Greets!
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Old 9th November 2013, 10:09 PM   #20 (permalink)
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I am using the OE R32 hard pipe on the front along with std size R32 braided line and the rear is still the R32 std spec braided line. I was looking for a rear R35 braided line to make use of the R35 hard pipe but I am not fussed as the std braided line would fit just fine.
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