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There’s probably a dust shield on the inner side of the disc which might make access a little tricky.
Yeah there is on this car. Hopefully I'll be able to see/ hear where the rubbing is and go from there.
Sometimes rust builds up on the edge of the disc
Yes, on a 5 year old car where the discs have worn a bit. But not a one year old car with low mileage.
I’m only ignoring comments like “just drive it”. I am driving it but want to make the rubbing stop and was worried about the rust. There’s been a lot of good advice from most people which I’m using.
You're following the advice that reinforces what you're already thinking.
You can knock it off with a hammer or similar
What Could Possibly Go Wrong.
If it's com in Ng back when you corner I'd be more concerned abot wheel bearings than rusty disks
I’m only ignoring comments like “just drive it”. I am driving it but want to make the rubbing stop and was worried about the rust. There’s been a lot of good advice from most people which I’m using.
Ok, I'll turn my advice level up a notch.
Stop fannying about......and just drive it.
On my way home this evening I found an empty dead end road and did a few reverse to 20mph and brake hard. It definitely got the rear brakes working more tjan going forwards as I could hear a rougher sound from the rusty surface and the rear discs had a few new faint rings in them.
Got home and checked the rear brakes. Both rub and passenger side makes a louder rubbing noise. There's a little more rust on this one. Took the wheel off and gave it a good brush with a new wire brush. The rust is pretty solid on there with only a few bits wearing down a bit but managed to make it slightly smoother.
Also checked for any movement of the wheel bearing but they seemed fine.
Totally agree with cougar and RNP. Drive it. Drive it fast. You could probably trigger the EBD to trail a rear calliper a bit by braking at high speed on a bend, but really? No. It’s rust, it’s less hard than the pad material and will go away. Brakes on the Giulia and the Van rust up in about ten minutes after a wash. Quick scoot ‘round the block with some and the “graunch-graunch-graunch” goes away.
Also it’s a Citroen: high likelihood that the handbrake acts on the front discs, possibly through a line lock (though those TRW combined calipers with servo motor handbrake are everywhere as they’re cheap-cheap).
Honestly fella, what you are experiencing is mechanically a non issue. It won't impair braking performance now or in future, it won't damage the pads and the noise will sort itself out over time.
But if you really want to make it an issue and clear the discs, fill your boots. Crack on with the wire brush, make sure you do both sides of the discs and have a good look at the edges. Due to the lack of use you won't have a lip on the edges that has corroded more, so probably best stay away from the hammer.
Personally I would just drive it.
You might now have some debris between the pad and disc. Try flushing it with a pressure washer/hose.
If you're in doubt an MOT test station can check the performance of the rear brakes.