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Discussion Starter #1
On 1.9 JDTm, does anyone know if the two large bolts that secure the calliper carrier (bracket) are single use items?

I haven't yet found any mention of them needing to be replaced, but on my previous cars it was always advised as they were TTY (stretch) bolts which, once torqued up over 200Nm, should never be re-used. Wondered if anyone knows for sure?
 

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My 1.9 had new pads on the rear last week and the specialist I used didn't use the new bolts, I'm pretty sure of that.
Took out the old and refitted them.
Will just pop out and check to make sure I/m not going totally mad.......

As I thought, the bolts are the original. They are a good outfit, so I assume they know their stuff!!
 

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Discussion Starter #3
Thanks for checking but if it was only pads you had replaced, it is unlikely that they removed the caliper bracket. Pads can usually be extracted easily by removing just the caliper itself, however when removing the disc, the bracket (to which the caliper fixes) must also be removed as it "hugs" the edge of the disc, preventing its removal.
 

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Ahh.... sorry, misread and totally misunderstood the question!
 

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Discussion Starter #6
They can be used again. Never heard of them being replaced at all :confused:
Okay thanks :thumbs: Probably just being paranoid but I like to be sure I'm doing things right, especially with brakes!

It's quite common on German cars, as the torque spec's are e.g. 190Nm + 1/2 turn, where that last 1/2 turn actually stretches/deforms the bolt into the thread. Hence, "always replace" in the workshop manuals. Common on cylinder head bolts as well.
 
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I am no expert obviously, but I have done my fair share of rebuilds, refurbs and DIY. I changed the brake rotors on the GTR once before I found out I had to be rid of it, and I did change the bolts if only due to the fact that I did have intentions of doing track days and thought it prudent. But for DDriving, I think using them twice is fine from what I have learnt and been told but I would not do it for the third time...bolts are a cheap item and much better to err on the side of caution.
 

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I've never replaced caliper bolts before. Head bolts sometimes depending on the type.

Am i right in thinking that stretch bolts contain a area of reduced cross section?
 

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Not saying the German cars mentioned above is wrong....but in my 15 or so years twirling spanners i never came across a car that needed caliper bracket bolts due them being TTY bolts (aka stretch bolts). The only ones I replaced were corroded or had chewed socket heads.

...and yes TTY bolts usually have a wasted, thinner section (with no threads) which is the "stretchy" part.
 

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Same here I have never known they to be TTY in calipers, I only change head bolts and some other bolts ( bmw prop and driveshaft bolts) as they are clearly specified single use.
Never changed caliper carrier bolts but equally I don’t go looking for torque info either so they could well be specified single use.
 
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