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Hello Rob, Not sure if this may help, but I would first check the connections on the top of the brake master cylinder. These may have been disturbed/strained when the mechanic most likely would have taken the top off during the brake pad renewal. Kind regards, Gareth.

I am aware it may not be listed ,but the Audi quattro of the group B era, that started off the big list of superb well built supercar eaters! Oh go on the RS6 Avant...

Just to clarify, you are technically breaking the law by removing your DPF. I mentioned previously (see above) about a friend of mine looking to remove his DPF. The garage suggested he may want to look at finding someone to do the removal for him as they were not willing to carry out the work as they would be heavily fined if the authorities tracked any DPF removal back to them. The car owner would be fined as well. There is an argument that most modern cars can still meet current emissions regulations without the DPF so therefore pass the MoT, but if you've removed the DPF and it does fail you're looking at the cost of refitting and the purchase of a new DPF unit assuming you haven't kept hold of it. And remember if you've removed the DPF and the car is still in warranty period, Audi will more than likely argue that you've invalidated the warranty on anything to do with the engine, possibly even more. It looks like I have the same model as you Wesley, and would suggest if its bothering you to put it into manual as soon as you get to m'way speed and knock down a couple of gears to get the revs over 3000rpm. I do occasionally get home after a 14-mile (mostly at 70mph) drive from work to have the fan running for 10/15 minutes once I've switched the ignition off, and believe this is to help dissipate the heat created by the DPF regen.