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Hmm, been following this thread with interest, in a previous life I was a naval engineer, so I’m very aware of just how corrosive salt water can be, even over a short time and of course vented discs have an ‘inside’ that you can’t see, that’s corroding away merrily that close to the sea. ceramic discs will stop it all. Coated discs, as Charles said, if it’s just a surface treatment, it clearly won’t survive as a surface very long and will then allow the swept surface of the disc to corrode, but, as it’s the swept area, there’ll still be the nasty grinding noises when you 1st use the brakes. the coating, assuming it covers 100% of the entire disc (inside & out), would still stop those areas corroding but at a much lower cost. depends how much the grinding gets on your nerves. be interesting to see how you get on if you go for the coated discs, I’m fairly close to the coast (7 miles) but it’s not too bad here for salt spray etc, we get some, but only in high winds & storms.

Welcome Isaac, and thanks for joining. Are the working and non working front and rear brakes diagonally opposite? If so, could be associated with ABS-? ‘…help a brother out….’ Masonic? Kind regards, Gareth.

Thanks yes, saw that thread. It seems a common issue with the C7, they like to let water in as much as possible. Further investigation this evening and I narrowed down the leak. See the picture attached, but the leak is coming through a seam in the side wall. Circled the area in red. I have sealed this area with Gorilla waterproof patch & seal tape. I removed the Voltage stabiliser unit to dry it out, and also moved the wiring loom for the Voltage Stabiliser unit up and back out of the spare wheel well up into the area where the main fuse board unit is. I hope that these two actions will cure the problem.