Want to check seeing as I'm new to the forum and don't know the ropes here yet - there isn't a thread for stupid questions that don't really deserve their own posts. Is it cool if I ask that stuff in here?
Example - my new master cylinder and stainless brake lines came in, I assumed it would all come with crush washers (don't know why I thought that, but oh well), but only the m/c did. I don't have a way to measure accurately and am not seeing the specs - is it 10mm washers I need for the brake lines? I saw somebody claiming that it's dangerous to use aluminum crush washers but don't understand why that would be... is that true and I need copper or does it not matter? Going to be calling around to see what I can find in town.
Hi fixthe,
there are no stupid questions, although there may be sarcastic replies.
Crush washers are hollow, are of circular cross-section when new and squash flat when they are used,
Your oil drain plug washers are like that.
The brake line washers ain't crush washers. They are plain washers made out of copper and yes, they have a 10mm bore.
Most likely the 10mm bore copper automotive washers you'll find in town will be thinner and have a larger outside diameter.
But they'll still work OK if your local bike store don't stock the correct ones.
And yes, I dunno why aluminum washers would be dangerous either.