I have a vw polo and everytime i slow down to brake my car cuts out completely and the red battery light comes on, i wanted to know what it could be thats making this happen?

A car I had did this (not a VW though). It turned out to be a dirty throttle position or body slider (or somesuch name). Once cleaned the problem was resolved. No idea where yours is located, but mine was near the air filter.

Fault codes would help, but based on the fault description You probably need your throttle body cleaned and basic setting carried out on throttle.

try cleaning your battery terminals and tightening them. if that doesnt solve the problem your battery or alternator may be dying, some auto parts stores will do a charging system check for free that will tell you if one or the other is bad.

Sounds like you may have a bad alternator.

i had same prob. Sorry but im a noob when it comes to car stuff. I think its called the airflow, it just needs cleaning cost me £25 for him to clean it, piece of ****. Hope this helps.

could be wiring that shifts loose. is it only under hard cornering? i had a problem with a vw that made a buzzing sound everytime i cornered hard. it turned out that my oil pump wasnt picking up enough oil under cornering becuase a piece of plastic int he sump was missing.

Try starting the car and while the car is running disconnect the posative ( red ) cable. If the car stops then you need to replace the alternator. This will cause the battery light to come on. If the car still runs then take the car to advaced auto or some car parts store of that sort and they will check your battery ang charging system for free and tell you what parts you exactly need. I hope this helps. Don't forget to rate my answer, thanks.

turn ignition from off to red light on 3 times whilst continuosly pressing trip clock down until A line of dashes appears in trip clock reading

change the brake sensors on the front pads i had the same problem

not being smart but you are being fed porkies.. it sounds like you are drawing air somewhere or you have throttle body problems. you will need to get it on to a diagnostic computer to tell.