Bolt torque question for front/rear calipers

[eightamrock]

Hey Y'all.

Just ordered up some front and rear rotors/pads for my wife's 2015 Q7. The dealer wanted 1800 for a brake job, and I felt that I could do this myself after watching the videos and reading up on it. $500 worth of parts from ECS and some elbow grease can save that money and put a new set of PSS10s on my S4 :p

I have a few questions though.

What is the actual torque for the carriage bolts that hold the front caliper on? I've read 200ft/lbs, 200nm (148 ft/lbs), and watched one video where the guy torques it 120ft/lbs. Those are all wildly different. Same question for those rear M16 triple square bolts that hold the rear calipers on.

I've poked around a lot and found some diy, people quoting service manuals, etc, are all different too.

I'm thinking 200nm is right. That's 148ft/lbs, and seems plenty tight enough to me. It also doesn't seem like any of the other bolts really have specific torques. Most look hand tight. My main concern is if any of these are stretch bolts that need to be tossed and replaced rather than reused.

Any help is appreciated.




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[87supraman]

This is from my Bentley manual for the 07-09 Q7. Assuming your 2015 is still a 4L chassis it is probably the same.

Front
Rear shows 180Nm.

[eightamrock]

This is from my Bentley manual for the 07-09 Q7. Assuming your 2015 is still a 4L chassis it is probably the same.

Front
Rear shows 180Nm.

Thanks for this!

I can't believe it really is 200ft/lbs. Its no wonder they want you replace those hex bolts, those things are probably seriously stretched.

I wonder how many people actually do this. 3 YouTube videos make no mention of replacing them, and they tighten at lower torques. I bet no one who diy's replaces them and probably almost no Indy shops either.

Looks like I'll be hunting for a 200ftlb torque wrench. Does it mention the spec of those bolts? I'll order some new ones.




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[RAudi Driver]

I do my brakes all the time. Never tighten to 200 ftlbs. I'd say about 150ft lbs is what I go to and they've been fine for the last 10 years.

[eightamrock]

I do my brakes all the time. Never tighten to 200 ftlbs. I'd say about 150ft lbs is what I go to and they've been fine for the last 10 years.

Do you ever replace the bolts?


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