Its not a stock bolt as its a big brake conversion, thats the point. The stock bolts are 10.9 IIRC. Its a precaution so that they dont fail when your doing high speed braking.
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Tom C - www.rcmr.co.uk
Audi UR Quattro
Audi 100 C3 2.0 5 cyl 115ps
Audi S2 - 07k engine project aiming for 800ps
Audi B5 RS4 645ps 911nm -
The load on these bolts is shear while you are braking. The max force is as the wheel locks up. Doesent matter what size brakes you have, lock up and tyre friction is the limmit. Stock bolts torqued right will be 100%. Going to "stronger" bolts can bring other problems.... Thread lock in new stock bolts if your worried.Comment
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you have missed the point here a bit. The thread was started as the person has low tensile bolts 8.8 fitted when AP brake setup was fitted, the stock bolts from audi (and they no longer fit with the brake upgrade) would have been 10.9.
SO, the point here is that hes not upgrading his bolts, but making them same strength as original or stronger. NOT weaker.sigpic
Tom C - www.rcmr.co.uk
Audi UR Quattro
Audi 100 C3 2.0 5 cyl 115ps
Audi S2 - 07k engine project aiming for 800ps
Audi B5 RS4 645ps 911nmComment
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the shear forces dont even get a look in - the clamping force means that the friction between caliper lug and bracket holds the whole lot together. The bolts' shearing properties would only come into play if the bolts were loose.....
The higher the tensility of the bolts - the more clamping force and therefore higher frictional levels are obtained.
I've rebuilt many a zetec - the cam pulleys do not have key ways, they rely purely on clamping pressure - never had a problem.....sigpicComment
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Is it advisable to use titanium bolts? They'll be lighter but I am not sure about strength and they resist corrosion.Comment
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