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Discussion Starter #1
Hi all,

Just replaced front + back pads & rotors and now they make a grinding noise. Tested it on jack stands without the wheels on and it sounds like 3 out of 4 wheels are rubbing. I found the new pads to be an extremely tight fit in the calipers.

Putting the car in drive while on jack stands I found that the wheels were spinning at a different rate (one didn't even turn immediately).

Is this normal?

Best,
VD-CH
 

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Touareg Brake Specialist
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No no no!! Nothing normal about this at all!! Please feel free to call me and we will discuss in detail. Too much stuff to write up here.

I’m available right now on Sunday by calling my main number. Please have your complete parts list of goods purchased? I’ll want to know exactly what you bought.

Regards,
 

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Discussion Starter #4
I appreciate the offer, @QPower1 , but I can't put in a call right now.

The parts are:

BREMBO P 85 065 (pads)
BREMBO P 85 070 (pads)
BOSCH 0 986 479 095 (x2 - rotors)
BOSCH 0 986 479 251 (x1 - rotors)
BOSCH 0 986 479 249 (x1 - rotors)

What do you think is the issue?
 

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Touareg Brake Specialist
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Could you have installed a pad backwards? the grinding you’re seeing is completely about something being where it doesn’t belong. Simple statement but take its countenance to heart. I’m unable to verify those pad numbers. Bosch rotors are most likely not high carbon iron, a fundamental part of the basic nature of this design. Grey iron rotors will provide inferior braking results... none of which explains your scene. You are welcome to call me via Skype... 1-508-283-1875
 

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Touareg Brake Specialist
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I’ve found an online Brembo catalog. They validate the pad choices as correct for the V10 model only. The pictures indicate the correct rotors size. Something isn’t seated properly, or detritus wasn’t cleaned away adequately, but the only way you get grooves or scrapping on the surface is when the brake pad plate effaces metal on metal. Friction material wouldn’t do this! You might Blue a rotor, but you’re scrapping that surfaces... now you’ll need to dismount the caliper to check for covalent damage on pads or caliper body. I think you put it together incorrectly, but you’ll need to be my eyes and ears. I think it’s possible the rotors are properly seated? Could you tighten down the rotor retention bolts fully?
 

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Discussion Starter #7
Thanks for checking up on that, @QPower1 !

How I installed them: after cleaning the hub I set the new rotors on and "torqued down the single Torx screw to 15nm (spec). To the best of my knowledge all four disk are installed properly. There doesn't seem to be any dirt between the rotors and the pads.

Getting the pads in the calipers was a very tight squeeze. Could it be that I just need to bed the brakes?
 

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Touareg Brake Specialist
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No!

Bedding brakes on a street vehicle is a rubric and doesn’t mean much. One should always drive a test run after installing parts, but no amount of “bedding” or otherwise accounts for scarifying the rotors like this!!

Something isn’t installed correctly and you’ll need to redo this job. Pay close attention to the parallelism of all parts... does anything appear out of position?
 

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Picture 6642 looks like there might be something on the brake pad, to me the other pictures just look like the brake pad is starting to wear the coating that is put on the rotor off like you would expect from using that type of coated rotor.
 

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Picture 6642 looks like there might be something on the brake pad, to me the other pictures just look like the brake pad is starting to wear the coating that is put on the rotor off like you would expect from using that type of coated rotor.
I agree with you about pic 6642. Pic 6643 seems to have one similar band as well. Seems like something might not be paralleled as previously mentioned. Either that or debris between the pads and rotors.
Kind of odd that the rears only look like they're contacting certain areas of the rotors.
 

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When you pulled the caliper off and removed the pads did you clean and re-grease the slide pins in the caliper ? Most people don’t do this and it means the floating side of the caliper doesn’t float and that both sides of the caliper may sit uneven or in your case could be rubbing against the new disk.
 

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Touareg Brake Specialist
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Ah... a novitiate!
These Brembo calipers aren’t a floating type. No sliding pins, per se. none of them are. All fixed designs. Only the pistons move inside their hydraulic bores. The hardware serves to locate and tension pads for use.

Brembo calipers don’t suffer the breakdown ratio of the floating/sliding caliper designs. Very efficient and enhanced wearout for the part.

🤷🏻‍♂️
 

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Ah... a novitiate!
These Brembo calipers aren’t a floating type. No sliding pins, per se. none of them are. All fixed designs. Only the pistons move inside their hydraulic bores. The hardware serves to locate and tension pads for use.

Brembo calipers don’t suffer the breakdown ratio of the floating/sliding caliper designs. Very efficient and enhanced wearout for the part.

🤷🏻‍♂️
Ah yeah my bad, still adjusting to quality gear and hadn't had my coffee yet to go read the workshop manual, have since had a read through as I've just had my brake wear light come on, time to replace some pads myself
 
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VD-CH
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