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Hi all. I recently bought a B8 RS4 as a daily, it’s a 2015 15 with all the right extras apart from a pano roof. I’ve come out of a new M4 Comp as I recently bought a Cayman GT4.
Already had a few issues and I’ve not had a single day without some kind of warning light! Suspension fault which ended up having new sensors, a control module then a rear damper. Then an Oil cooler change as was using oil! Now the windscreen bottle is leaking and I’m getting a check coolant level even tho I’ve topped it up! Fortunately the garage I bought it from out a 6 month warranty on it and have been brilliant with the issues.

A couple of queries, the brakes feel a bit spongy, it’s had a brake fluid change and there’s plenty of life in the discs and pads. Have I been spoilt having Porsche’s and just come out a brand new M4 Competition or is this an issue?
Also, it seems to engine brake very heavily when you let off the throttle especially in S mode or manual mode. Is this normal too or an issue?

I’m hoping I’ve not bought one of those cars, it’s done 48k miles but they were all motorway miles. I don’t do hardly any so I won’t be putting massive miles on it.

Any advice greatly appreciated!

Thanks
Graham

Brakes not totally inspiring. Not sure I’d call it spongy but needs a good shove

Certainly no coast function but I wouldn’t say over braked through engin breaking. Can you measure? Say 70 to 50 in fourth?

I do note I can drive in traffic without using brakes when many are on and off theirs but put that down to a lack of awareness in others regardless of type of car

Thanks Grittle, maybe it's just me then getting used to the car! Spoke to my mate who's just got an RS5 and he says it does the same with engine braking. It's probably just a trait of the big V8 to be fair.
I see you've got a toy and a daily too, good choices!

I too have found that the RS4 appears to engine brake a lot, like it has a lot of rolling resistance over other cars I’ve owned... I think this is just a trait of the V8 and Torsen system. I’ve just changed the discs and pads and it has changed the feel of the breaking, it felt spongy before however now much more positive, neither the removed pads or discs were near their wear limits but definitely feels more positive.