Stripped the front brakes on my 2007 Fabia VRS TDI and the M12 bolts that hold the brake carrier stripped the threads out when removing the bolts! Repaired using ‘V-Coil’ (heli-coil type) kit. Posting this as no one else seems to include parts/sizes etc.

It's an easy job with the right parts and tools:

 

Parts:

2x M12 x 1.5 x 35mm Bolts - these bolt the carrier to the stub axle. (Both these part numbers are genuine VAG: CFB606B-2 or N90708504) – Around £7 for two bolts!

V-Coil 4022 12mm x 1.5 Metric Fine Thread Repair kit - £35  https://www.amazon.co.uk/gp/product/B00EO4MPC4/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

This kit includes; 12.4mm drill, 12mm tap, 10x thread inserts (around 15mm deep), insert tool & tab removal punch.

Thread lock Red - e.g. Loctite 2700

WD-40 Specialist Cutting Oil - £6

 

Tools:

Drill with 13mm chuck (engineering drill with keyed chuck if possible)

Tap wrench (large enough for ¾” square tap or make one up with ½” T bar, sockets & 10mm straight Hex)

18mm socket (for carrier bolts & wheel nuts)

12mm or 13mm socket (for carrier slider bolts)

PZ3 screwdriver (for brake disc screw removal)

 

The main issue is drilling out the 2x holes with the 12.4mm drill bit, you need a drill with a large 13mm chuck and strong enough to stop the drill bit slipping!) I used a heavy duty SDS Plus drill with an additional attachable chuck (key type) so I could fit the normal 12.4mm drill bit, I initially tried drilling very slowly but the bit grabbed straight away slipping the clutch on the drill. In the end I had to start at full speed then try to slowly move the drill through the hole, this worked but pulled the drill through the hole very quickly (very difficult to keep perfectly straight!). My top hole ended up on a very slight angle. I was going to use the cutting oil for drilling but didn’t get chance to use in the end. Just try and make sure you drill through straight as the carrier bolt holes don’t allow for much error. Ideally it needs an old slow speed engineering drill with 13mm key chuck and no clutch.

I didn't have a tap wrench but discovered the end of the M12 tap fit into a 3/4" square socket, so I used a 10mm socket on the tap (wrong way round) and used a 10mm hex bit to go into another 10mm 1/2" socket and then onto a 1/2" 'T' bar. It was slightly loose but worked fine; just hold it straight when cutting the threads, use the WD-40 cutting oil and backed in/out when cutting the threads.

I didn't have any brake cleaner so used normal WD-40 to clean out the cut threads, then washed out with white spirits. Once the threads are free from oil screw in the V-coil inserts, put Red thread lock on so they lock in. I screwed them from inside the wheel arch until the inner face was flat, so the extra insert threads could be seen sticking out (about 5mm) when looking at the axle, then break off the insert tabs, I didn't bother removing the extra screw threads as they only stick out as much as the original bolts. You could cut/grind them off if needed but not a lot of point.

Re-fitted the carrier and M12 bolts are now nice and tight.

Good luck.

Superb pictorial! Had to do this exact same job earlier this year. Stripped my threads due to stupidly getting mixed up with 'lefty-loosey & righty-tighty' from behind.

Sure your post will help others, oh! and welcome to Briskoda.

I havn't stripped any of the threads yet but I did buy a Ford, VAG & Vauxhall repair kit very cheap on Ebay which was recommended on this forum, it comes with drilling jigs set to the hole centres of the various manufacturers which will prevent or mitigate against misalignment from the drill bit snatching.

 

The inserts are a splined Top Hat type so are pulled into place against their shoulder by the caliper bolts & will pull up square against a small misalignment, a lot easier to use than Helicoils as well and no risk of them unwinding.

JR- my local machine shop tells me that VAG carriers are his best quick money job. But I've vnoticed that on 05 models the allen bolt has been replaced with a standard nut. Mine had a "35 point check, and I suspect pad change" at a well known place prior to sale. 75k miles later and no problems .