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@reeen
wd40 is first a resolvent secondary a very light teflon oil. not suitable for all rubber parts nor moving parts like chain and bearings as it is simply too light to hold a lubricating film while under pressure.
i'd also wouldn't use it on new brakes, as they are greased by assembly and wd40, you know, resolves the good lubrication on it.
it is very good for stuck parts, rusty stuff, bearings or chains that are rusted stiff, may be restorable with it, but have to be properly oiled/greased after derustification.
often peeps use gt85 on their bikes as it seems to contain less spirit. i prefer the teflon spray that comes in the muc off double or white lithium spray grease like sg85, if i feel the need to stop my saddle squeaking. all else is either chain oil or grease.