Got a 54 reg Audi A4 Cab 1.8T petrol.

Having some problems. Basically the car losses power, still keeps going but at 20mph max.

Then the ABS light kicks in and the car starts emergency braking.

If I tap the brake pedal, the abs problem stops, but then comes back again.

Been in twice at an Audi specilist but still not able to sort the problem.

Anyone else had this?