How do i change my brake light switch?

i have a K reg astra estate but cant quite get to the brake light switch.is there an easier way to fit it?How do i change my brake light switch?the switch will be on the Master cylinder if that is truly your problem you just have to locate it and remove anything that's in your way and replace itHow do i change my brake light switch?Are you 100% sure thats the problem? Thay usually dont fail. If it is the problem then you have to change it. I assume its behind the brake pedal.

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