Braking Problem In The Wet

[bn8959]

“To stop the feeling of having a long pedal when you are really working the brakes we fitted a booster which brings the pedal back up when it’s getting long – sometimes it can come back right to the top of the pedal travel.”

but that's not true - this happened to me on a normal slow commute in - I gently touched the brakes and full on braking came on for a second. Was not honing or driving fast in anyway whatsoever on the whole journey. There was no long pedal/fade or anything it was emergency braking from a light touch. Had only happened a few times but it did happen. I don't accept Reil explanation as its not what happened to me or what it sounds like to others here.

standard brakes. with regards to ceramics - I don't belive they can pick up so much water steel or cermics that you get that emergency brake - never had it on any other car either with ceramics or steels - DB9 M5 E63 AMG, 911tt's just the RS6

This is exactly what Ive experienced too.
Other similar discussions/symptoms here:
viewtopic.php?f=76&t=127418&p=874285#p874285

[r45hRS6]

That certainly doesn't sound right!

I have the opposite problem when running in the wet - the wipe function doesn't really dry the brakes so when braking after a prolonged run in the wet they are initially (1-2 secs) not very effective at all - the result, much like you, is that you brake harder and then they suddenly catch much harder than you want. I have ceramics BTW and am told that the frequency etc of the wipe is different but in all other respects the system is the same.

My solution so far has simply been to ensure I brake early and fairly frequently to avoid the problem. I may also have to train myself to go back to cadence braking like in the old days.

Can the brake functioning (and wiping) be monitored in real time with VCDS?

Hi Guys,

After 5 months of ownership and much spirited driving i must say I've never had any issues with the braking until this weekend whilst on a 400 mile round trip up north from London in the loving arms of storm diedre. It was only pouring rain but the braking system in my opinion was a little slow to react compared to previous reaction times. Obviously the copious amounts of water i expected was the cause.. car remained planted through water and did not aquaplane BUT on one occasion i tapped the brake gently to shed a little speed and the damn thing nearly did an emergency stop... A complete WTF happened moment for me. Its happened only once but scared the living daylights out of the family.

BTW: i don't have ceramics and i suspect i have experienced what Chris has mentioned above. I'll definitely be more aware of this function/issue with the braking system. Which is it?

[Sedge5]

That certainly doesn't sound right!

I have the opposite problem when running in the wet - the wipe function doesn't really dry the brakes so when braking after a prolonged run in the wet they are initially (1-2 secs) not very effective at all - the result, much like you, is that you brake harder and then they suddenly catch much harder than you want. I have ceramics BTW and am told that the frequency etc of the wipe is different but in all other respects the system is the same.

My solution so far has simply been to ensure I brake early and fairly frequently to avoid the problem. I may also have to train myself to go back to cadence braking like in the old days.

Can the brake functioning (and wiping) be monitored in real time with VCDS?

I was in really heavy rain at high speeds....hit the pedal and for a few secs(or so it seemed) absolutely <beep> all!!

I <beep> me self then they bit!!

I have ceramics also

Do you also get these annoying 'screams' from the ceramics, especially when wet?..... l always look around to see if anyone has heard me, but then, of course, l have even woken up the neighbour's obese dog....!

[Daveperc]

Do you also get these annoying 'screams' from the ceramics, especially when wet?

They were very noisy when they were new, but seem to have bedded down now. Don't think they are any noisier when wet, though they are a bit noisy when they have been put away wewt, and then restarted the next day.

[Mr Footlong]

Weird, I did the best part of 7 hours driving in Monsoon weather most of the time last weekend and can't recall any problems with my steel brakes. Will keep an eye out but it was at least 3 hours each way in that weather.

[Paulm]

I had this on my 2015 RS6 twice in 6k miles when it was new and so far once on the RS7. For me it happens with breaking from speed going downhill. Never happened in the S7. weird and scary the first time it happened. Cant remember if it was wet or not.

[Scotty C]

Brake servo testing tool arrives at dealers on Monday, having waited two weeks for it, so maybe that will highlight something, although I doubt it will. For now I'm raking up some heavy mileage in a Q7 S Line they've given me - it's obviously no comparison but at least the brakes work as they should,

[Covkiller]

If the Audi servo test doesn't find anything I would first fit braided hoses and if this doesn't work I'd also fit front Ferodo DS2500 pads

[MikeFish]

If the Audi servo test doesn't find anything I would first fit braided hoses and if this doesn't work I'd also fit front Ferodo DS2500 pads

I have this combo and don't have the problem. Can't say I had it before this combo though.

[superlightr]

it felt like a software issue to me - the computer was applying full braking for a split second rather than a physical defect.

[Tadass910]

Guys I think you all a little paranoid, just drive and enjoy your cars)

[Paulm]

Guys I think you all a little paranoid, just drive and enjoy your cars)

obviously never happed to you then. Trust me its not nice when it does.

[Scotty C]

Guys I think you all a little paranoid, just drive and enjoy your cars)

obviously never happed to you then. Trust me its not nice when it does.

And certainly not nice, or paranoia related, when it is continuous for two days solid...
Brake Servo Tool has arrived and the car is being looked at today so will update as soon as I hear anything...

[Scotty C]

Well surprisingly the brake servo test has revealed nothing other than it is working perfectly normal. Audi technical have no other suggestions as to what it may be other than to keep road testing the car. Without wishing for bad weather, I have suggested a 30 minute at motorway speed road test with wipers on may trick the car in to believing it is raining and give them the answers they are unable to find just by looking on a computer...

[Paulm]

Well surprisingly the brake servo test has revealed nothing other than it is working perfectly normal. Audi technical have no other suggestions as to what it may be other than to keep road testing the car. Without wishing for bad weather, I have suggested a 30 minute at motorway speed road test with wipers on may trick the car in to believing it is raining and give them the answers they are unable to find just by looking on a computer...

keep us posted would be good to find the cause