veganbikes

If you need to ever clean a brake use isopropyl alcohol beyond that don't use sprays on a bike nothing should ever need to be sprayed on a bike if you need to use a spray use it on a rag and then use the rag on the bike. However with brakes use clean stuff don't use rags especially ones cleaned in diesel or anything like that. I would just use a clean paper towel and isopropyl alcohol. Brakes do not need to be lubricated with anything and if they do it is specific stuff and would never be done with pads or rotor installed and you don't want any sort of lubrication or oil anywhere near the braking surfaces so those would get cleaned with isopropyl alcohol and a clean paper towel.

If you have metal pads and rotors and a fire resistant surface and understand fire and burning things you can clean pads and rotors by soaking them with isopropyl and setting them on fire. This is quite dangerous and one must be careful when doing it. It may not work in every situation and you may still need to replace stuff.

WD-40 for those who still aren't aware is a water displacer and not really useful for many things on bikes aside from maybe helping after you have cleaned your chain. You will still need to properly lubricate it with a proper bike lube which the WD-40 Company does make under their Bike products line but that is separate from WD-40 the product.