Lad1234

Can anyone help a man out I have recently noticed when I use my front windscreen washers on my Audi a4 the heater blower starts to blow fully and then it will gradually die back down to nothing and I have also noticed that I have to press my brake hard for the brake lights to work could it be a fault brake peddle switch all help appreciated Also I have fitted a dump valve and it has been working fine on my way to work half way there the dump valve no longer works anyone help me out

Hi new on here from Durham Audi a4 b6 tdi