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Definitely doable by the road side but easiest if the road is flat, it's a fair bit less delicate than bleeding bike brakes. I'd offer a hand but I'm rarely in the country these days.
Here's a good video.
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All 6N polos have drums on the rear (in the UK). They have self adjusting shoes and are notoriously shit.
When they stop self adjusting, the brake pedal gets longer in travel and it makes them feel rubbish. I’d be tempted to chuck a new set in and give all 4 brakes a bleed / a full fluid change if it’s not been done in the past 3 years
Are they discs all round or drums in the rear?
Changing disc pads is something you'd definitely be able to do, drums are a bit more involved but easy enough still. How's the pedal feel? Is it at all spongy as it may be time for a bleed or fluid change.
I get pretty paranoid about brakes these days because when I was in NZ I had a total brake failure and put my little 4x4 corolla through a fence and then ended up on a sandy beach!