Hi, I haven't had my mini long and when I bought it, I didn't notice it had a nail in the back right tire. It goes flat pretty quickly; If it's filled up the tire pressure light will come on about 3-4 days later. I have run flats but it's getting pretty bad, would this cause the car to thump rhythmically with the speed of the car? It just started today and it's worrying me. It's more noticeable at slow speeds and you can really feel it thump, it almost sounds like the wheel is loose and it might fall off...... If it is the flat tire, am I safe to drive on it until I fill it up? I bought the car in pretty good condition, low miles, always kept in a garage, it was basically a weekend car. I've had it for about 4-5 months and this is the first thing that has gone "wrong" so I don't think it's anything serious.
Thanks in advance!