2008 jetta rear brake job question

[raaizin]

I am doing a rear brake job on a 2008 jetta 2.5. This vehicle is set up with a rear brake bias which causes much brake dust on the rears. I plan to use akebono ceramics to combat this issue. Stock VW pads com with new caliper bolts but the akebono's dont appear to. Ordered but havent recieved them yet. Is there any reason why VW suppliues new bolts. Are they stretch bolts by chance. If they are why wouldnt aftermarket suppliers add them.
Where could I get these other than VW dealer.Not sure if they just sell the bolts..

 

[skyactiv]

Yes, they are stretch bolts your not supposed to reuse. VW/Audi's use stretch bolts in some areas like the suspension, too. Don't reuse the bolts. It's like reusing a crush gasket: It might work or it might not.

 

[raaizin]

You are talking about bolts with 13mm head Not the long bolts with the 14mm 12point or triplesquare as some call it correct?
Any idea where I could pick them up if aftermarket pads dont come with them

 

[The Critic]

I think the triple-square 14mm are the ones that are stretch bolts. I think they call for 66 ft-lbs + 90 deg.

The ones that hold the caliper to the bracket just have some form of thread locker on them.

http://www.myturbodiesel.com/wiki/rear-b...or-cup-edition/

 

[Vikas]

Is VW the only manufacturer using stretch bolts on the brake caliper? Even some of the high performance Brembos don't come with that design.

Why?

 

[Thermo1223]

It is mainly AFAIK for making sure they do not lossen from heat cycles & vibration. One could use threadlocker and achieve the same result but make it pain to remove the bolt in the future.

 

[Vikas]

Most of caliper bolts (on passenger cars) are specified at around 50 ft-lb of torque and very few manufacturer recommend thread locker on them.

 

[The Critic]

Originally Posted By: Vikas
Most of caliper bolts (on passenger cars) are specified at around 50 ft-lb of torque and very few manufacturer recommend thread locker on them.


It's probably not good to comment on this matter at all, since the recommended torque values can vary WIDELY.

 

[Vikas]

The point was at that range of the torque, they don't just back out on their own. Hence very few manufacturer specify lock washer or thread-locking on caliper bolt and even fewer use the stretch bolt for that application.

As an engineer, I am guessing that the WIDELY means anywhere in the 40-80 range. Are you saying some specs them to be at 15-20? I am willing to argue with you if you want to continue your point.

I will go even further. You won't kill yourself or destroy the car if you can distinguish between "spark plug tight", "caliper bolt tight" and "lug nut tight" range and use the appropriate grunt to tighten a fastener. The people like you who needs a Snap-On $1299 torque wrench (accept no substitute!) so he can torque a fastener to exact 48.23 ft-lb are exception rather than the rule

 

[Cujet]

Not once has there been a re-used bolt failure.

Use it again.