help! front brake caliper mounting bolt threads stripped?

[peterdaniel]

Helicoil?
What Size?
These are the LARGE bolts ( 2 of them ) that hold the entire caliper to the hub

These are NOT The small guide pins.

What size kit and will it tell me what size drill bits to use to put the helicoil back in?

Do I need new sized bolts or will I use the old ones? Thanks!
Peter

 

[Mongler98]

Take the bolt to lowes. use the thread gauge to find what it is. or if someone has that knowledge here
order some helicoils in a kit. usually the amazon reviews will tell you if the drill is not the right size. For Steel... totally fine. aluminum is less forgiving.
timeserts are $$$ plan on $150 for TimeSert or $50 for helicoil Both do great and im a helicoil kind of guy and have had better results with them.
either kit will repair the thread back to the original threads it once had.
also HOW THE HECK did you strip that out?
if it was me, i would just replace the knuckle.

 

[Nuje]

The stock TDI front brake callipers are held to the steering knuckle by the sliding guide pins, and indeed, they have an odd-ball thread size (M9x1.25 - helicoil #5546-9) - part #5 in the diagram below.

The only way you'd have "big" bolts holding on the caliper (actually the carrier) is if you have a "big brake" upgrade (off a 1.8t or VR6) - which had a different brake arrangement on their steering knuckles (and you'd be looking for threads on part #10 below - I'm guessing them to be M10x1.5).

 

[Diesel Fumes]

Take the bolt to lowes. use the thread gauge to find what it is. or if someone has that knowledge here
order some helicoils in a kit. usually the amazon reviews will tell you if the drill is not the right size. For Steel... totally fine. aluminum is less forgiving.
timeserts are $$$ plan on $150 for TimeSert or $50 for helicoil Both do great and im a helicoil kind of guy and have had better results with them.
either kit will repair the thread back to the original threads it once had.
also HOW THE HECK did you strip that out?
if it was me, i would just replace the knuckle.

I had one strip before too. It's something you might not even know about until it's time to change your brakes. Bolt screwed in normally but never did tighten up. Just kept turning and turning. But didn't come out if you pulled on it

 

[turbocharged798]

Common problem, I keep a 9mm helicoil kit on hand for this exact thing.

 

[jmodge]

There is also a pin with oversized thread. Check Idparts website for it. Some local parts places may have them also

 

[mittzlepick]

Ecs tuning new spindle bearings, dust plate. Short money

 

[jmodge]

I ran into that while doing an emergency evening brake job so Donna could head to work in the morning. The pin was already oversized and rusted. Fortunately Advanced Auto had one in stock. 13894 is the pin. An insert is BGS 148-1, I don’t think you will find that particular insert though. If you do, post where you found it

 

[mittzlepick]

Helicoil never last just as temporary as one use pin fine print says not to reuse

 

[benshaw]

you could use half nuts with the same bolts but will need to file the hub surface down (your eye will tell you how much) and use a thin type wrench to hold to tighten up witha bit of threadlock.
(the shop monkey stripped mine cause he used a rattle on the soft cast iron. only found out some years later when i removed caliper).

 

[peterdaniel]

yah sorry should have made it clear.. these are 20AE big brakes.. ill just use of the extra GTi calipers have.. and they were from a junkyard so its possible that the prior owner of these brakes, overtightened them. Ill make sure to use a torque wrench and go to 92 ftlbs.. Thanks everyone