Posted 25 August 2011 - 12:03 PM
I can let you off the brake test switch and the choke because they are both old fashioned but the light switch? Come on, who is teaching people to drive these days? I know this makes me sound really old but recently there have been tons of questions that everyone with a driving licence should know the answer to. You are supposed to know that your car has sidelights (sometimes called parking lights), that come on at the first position of the light switch. You are to use them when your car is parked somewhere dangerous at night, or parked anywhere in fog, or parked anywhere outside a 30mph speed limit. Or if its not dark enough to use your headlamps without dazzling people but dingy enough that people might not see you like in heavy rain. Or myriad other things you have to use them for. Pretty much every car you might ever have found has them switched in the same way.
Brake test switch - as above if it comes on by itself it means the brake fluid is low (or one side of the circuit has failed, depending on the age of your Mini), this is likely to happen as you brake or with 'spirited driving' as the fluid slops around. It's a warning lamp really and all cars have them. The switch is only to test the bulb, a function most cars now provide by linking the handbrake warning to the same lamp. As before you are supposed to know what the basic warning lamps in your car do before you can pass a driving test, all cars have the same basic lamps. In this case though it is an unusual installation.
Choke - the choke function on the SU is two stage, operated by one pull cable. The first 1/4" or so of travel does nothing more than lift the idle speed. This can be used all the time in winter if needed, or if you are driving at altitude or if the car is just generally struggling to tick over. If you have to use it a lot the car needs attention. After this, when you start to feel more resistance in the cable, it's enriching the mixture. This setting is used for cold starting, the more you pull the richer it ges. It should only need to be used for about 3 minutes. Using it a lot when its not needed can damage the engine and will cost you more in fuel. You will have to close the choke manually. If the car can't start without choke, pull it right out and start up, then a few minutes later start reducing it slowly until its right off. If the car struggles to idle, pull it back out just enough to rasie the idle speed. So it's not much like a bike choke really.