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northwoods1
11-09-2017, 04:35 AM
My brake pad service light came on and I contacted the dealer to schedule installation of new pads. They are telling me I need to replace the discs as well even thought they are not close to their minimum thickness. I have replaced pads alone on other cars without problems but they say replacing just the pads will result in excessive brake noise. My discs show no sign of irregular wear -there are no grooves or scoring. Is this BS? Is there something different about the RS5 brakes that I am missing? I would rather not spend $2K + when only the pads are worn.

ffearless
11-09-2017, 06:29 AM
Your BS sensor is working well.


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mcbuck
11-09-2017, 07:27 AM
Pick up a digital caliper at Lowe's ~$20 and check the rotor thickness yourself. I believe minimimum is 32.4mm.

northwoods1
11-10-2017, 10:14 AM
My fronts are measuring between 33.25 and 33.44. My rears are 21.88

mcbuck
11-10-2017, 10:57 AM
There you go! New pads and proper bed procedure, and you should be good to go. No secret sauce there, much better ways to spend $2k.
Remember they exist to make money, not because they love you. The majority of folks would just bend over and take it instead of questioning as you did.

[up][drive]

northwoods1
11-11-2017, 09:23 AM
when replacing pads only, discs must be resurfaced, correct?

ffearless
11-11-2017, 08:40 PM
No, not necessarily. Just install new pads and bed them in properly.


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mcbuck
11-12-2017, 07:15 AM
Generally only machine rotors for grooves or irregular wear (you stated there was none). Even if you wanted to, good luck finding someone to take on a drilled disc.


Buck
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northwoods1
12-10-2017, 09:43 AM
Dealer replaced pads only. work included all new hardware and wear sensors. They performed the bedding in process -they said this is included in the service. After a few hundred miles all is fine. Thanks all for your feedback.

krism
01-23-2018, 02:38 PM
I was curious about this as well. I just bough a used 2013 RS5 a few months ago and had it inspected at the Audi dealership before the purchase, they said front brakes had 60% life left. I just measured the front rotors and they are just around the 32mm mark. So obviously the previous owner just replaced the pads, which, as discussed, is pretty typical and what I've done with all previous cars I've owned. After being transferred to multiple people I finally was able to confirm the minimum front rotor thickness which is 32mm.

spa
01-24-2018, 06:25 AM
fwiw minimum rotor thickness is engraved right on the hat of the rotor.

krism
01-24-2018, 07:23 AM
fwiw minimum rotor thickness is engraved right on the hat of the rotor.

I had no idea! But that totally makes sense, thanks!

spa
01-24-2018, 07:32 AM
You are welcome fellow Cdn Misano RS5 owner[up]

krism
01-24-2018, 09:30 AM
Nice! Which part of the country are you in?

spa
01-24-2018, 09:55 AM
Almost opposite ends, I'm in at the GTA part of Ontario.

krism
01-24-2018, 09:59 AM
haha ya that's a bit of distance... but nice to meet a 'car twin'!

krism
01-30-2018, 02:56 PM
Update: I was replacing a bearing and looked at the rotor, it is in fact 32.4mm minimum

pocketmaster
01-30-2018, 05:17 PM
Typical upselling for stuff you don't need. Unless they are groved, warped or worn to below the threshold you should be fine with just pads.

jaypilot75
02-25-2018, 12:26 PM
If you have a micrometer...you can check the rotor at 4 or 5 different points (in the middle) to ensure. Even with no grooves, it is possible for a rotor to be perfectly smooth, but warped. You may not notice a slight warping ( especially on the rear) but can cause premature pad wear and abs issues.