BCgeorgia

Hey all,
New 991.2 gt3 owner here.

I’m planning to do some brake work and want to do the caliper stud replacement as so many folks recommend. As far as I can tell, tarett engineering ($125/axle) and girodisc ($150/axle) make the stud kits.

Are either of these kits the preferred one?

https://tarett.com/products/brake-caliper-stud-kit

https://hinzmotorsport.com/products/girodisc-caliper-stud-kit-986-996-987-997-981-991-992

Tia!

vantage

I have a slight preference for the Girodisc kit. Both front and rear are stainless. The end of the studs have a hex nut integrated so it’s easier to install or remove. Also, it comes with a thread cleaner, which you absolutely need to use to install these properly.

talk to @Hinz Motorsport Rick will take care of you.

tarret kit is fine. Uses PMNA studs for front. But you have to clean off the red loctite that comes preloaded onto the PMNA stud otherwise it will be a pain to remove later.

Hinz Motorsport

I like the Girodisc studs a little better as they are more application specific in terms of how they are machined. That said the Tarett studs are great too. I have both options in stock. For the 991 GT3 you need BCS-02 for the front and BCS-08 for the rear. Let me know if you have any more questions on go fast bits for your car.

mipcar

If you install the studs, you should consider doing the lines as well if not done already as there is not enough length to the oem lines to install/remove over the studs. This was at least true for the .1. You should confirm.

https://www.essexparts.com/spiegler-...ear-6-line-kit

Hinz Motorsport

Yes I should have mentioned that also. The spiegler lines are recommended when converting to studs. I have the Spiegler lines in stock as well.

lisocayman

In the .2 there isn’t a need to change the lines just for the studs. Plenty of room with stock lines. I’ve done multiple pads and rotors with no issues. Unsure about the .1 length.

BCgeorgia

This is great to know. I was debating whether it was necessary or not.

BCgeorgia

@vantage @Hinz Motorsport thanks for the replies, fellas. Placing an order shortly.

jhott66

This past weekend I installed the Tarrett studs and Spiegler stainless lines. I recommend both. The stainless lines are great, very high quality.
Follow the caliper stud installation instructions exactly. Specifically with respect to install torque of the stud into the caliper and the retaining bolt to the stud.
And, yes, if you install the studs you need to install the SS lines otherwise removing/installing the calipers is more difficult that it should be.
If you have never installed brake lines before make sure you use a "flare nut wrench" for the nuts on the brake line fitting. You will need a 9mm, 11mm and I think a 10mm.
Brake line fitting nuts are pretty easy to round off and the flare nut wrench helps to prevent rounding the nut.

vantage

you may not need new lines but you’ll need to unbolt the line bracket. Getting the bracket back on without brake line bracket studs is painful. Get the tarret line stud kit.

jhott66

This is true. You certainly don't need the SS lines. The Tarrett stud kit is very useful if not installing new lines.

mthomas

An oddity I just observed on my 2018 991.2 GT3 in preparation for this job....

The front OEM caliper bolts are M10 hex and the rear OEM caliper bolts are Torx T55.

Why does Porsche do seemingly random scheisse like this?

BCgeorgia

@jhott66 @vantage thanks for the tip. I’m not finding much info on how to install the line stud kit. is this really straightforward? any tips or potentially a good “how to” link or vid besides the paragraph and pic from the website?

https://tarett.com/products/brake-bracket-stud-kit-bbsk

Hinz Motorsport

The brake line stud kit simply replaces the 10mm bolt/s with a stud and nut. The 10mm bolt is used to fasten the brake line bracket to the upright/wheelcarrier. It's the same principle used when converting to caliper studs from caliper bolts. There is 1 or 2 studs per corner on the front. If I recall, the rear does not require a stud in most applications as the hardline is attached to the caliper, not the upright. The kit comes with 8 studs and nuts to accommodate all applications. I have a few of these kits left in stock as well. A picture of their function is shown here.

vantage

If you can install the caliper studs you will have no issue with the brake line bracket studs. The only issue is that if you use a thread chaser to clean the entire depth of threads, the stud will screw in further than you need, meaning there will not be enough exposed stud to accept the bracket and nut. Therefore you need to just account for how much stud you need exposed when installing the stud…I.e. don’t screw it in all the way. Apply loctite to the part of the thread going into the upright and let it dry before securing the bracket.