"Fast Bikes", May 1, 2013


Don’t spray WD-40 on your discs. What, you have? Oops...

We all know that spraying WD-40 near your bike’s discs is a bad idea, but what is it in brake cleaner that make it OK to squirt all over your calipers? Lubricants such as WD-40 contain low viscosity oil and when sprayed on a surface they coat it in a thin film of this oil to help prevent rusting and disperse water. Obviously this isn’t ideal when brakes are concerned. Brake cleaner, on the other hand, is packed full of quite unpleasant solvents rather than oil. As well as butane there is isopropanol alcohol and methanol as well as some other nasty solvents that all help to shift the grease and grime from your calipers in the same way that paint thinners cleans paint from your fingers. Just like thinners, a low evaporation temperature means they disappear and leave a dry and clean surface with no residue – making them ideal for cleaning brakes; and starting fires!