Switching types of brake fluid (5.1 to 4)
Hi - noob here!
Just bought an 09 R6 to replace my old and tired 636. Love it so far.
Quick question though:
The guy I bought it from had put DOT 5.1 fluid in the brakes. The brakes are spongy and I'd like to bleed them. I've always used DOT 4 in my bikes. My understanding is that you are not supposed to mix 5.1 and 4.
Can I just run a bunch of DOT 4 through in order to replace all of the 5.1 that's in the system? I think I read something about using DOT 4 after 5.1 having an effect on the seals (around the brake pistons)?