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That means it was just dirty contacts, WD 40 washes some of that off but it leaves a sticky residue that will collect & hold dust & dirt over time. Weeks, maybe months. So it’s best to get some contact cleaning fluid (any electrical or car parts supplier should carry it) to wash off the wd40. (Think of wd40 as a sticking plaster).

Hello Ciaran, Disc wrapping can be an often-referred -to myth. Brake judder can result from a variety of causes, including mating surfaces of hub to disc not adequately cleaned of rust - if cleaned at all, sticking caliper pins etc. If you believe the judder is being caused by the solid discs not being able to dissipate the heat build up during braking, and vented discs would eliminate that, then you are braking too violently and too late. Regards, Gareth.