1:I've always kept my old brake fluid as it's a great paint stripper for old small bits.
2:I've also used it for,"Liquid De-cokes".Just add about and egg-cup full to a cylinder,spin the engine on the Kill switch a couple of times and leave overnight.It will break down the carbon in the tops of the cylinders.The amount used is so small as it's won't contaminate the engine oil but If you are concerned about any brake fluid going into the oil just do an oil and filter change.I've never yet had a problem with this method.
3:Drop any rusted parts nuts and bolts into a jar of old brake fluid and leave.Then when you wire brush them the rust will fall away easy.
4:Old brake fluid can also help to un-seize rusted nuts and bolts.


