Strange EPB behaviour....

[Lee S]

Took the car for a service to Audi the other day and they said the brake fluid needed changing so I instructed them to carry on.

Got the car back and all was well, until I pulled up at some lights and engaged the parking brake. The motors whirred for what must have been 5 or 6 seconds before the light and brakes engaged. Tried it again a couple of times and same thing.

I took it back to Audi and the tech insisted that they had not touched the EPB system and it had nothing to do with them bleeding the brakes. He put it back up on the ramps and checked everything again and said there were no faults or warning lights and it was all OK. I told him that the time the motors were on when I manually released the EPB was a lot longer too and for some odd reason he just told me to not use the manual release and to use the gas pedal all the time.

We exercised the EPB about 20-30 times and it got a bit better, so now it only takes 1-2 seconds for it to engage, but I could have sworn it was virtually instant (0.5 -1 seconds) before they did the brake fluid change. Is there anything amiss here? What's the normal engagement time for the EPB with fairly healthy discs and pads? Any adjustment that can be done?