Hello All,
It's been at least three years since the brake fluid was changed in my 150 and I've never done it myself, so I was unpleasantly surprised when a seemingly simple task took a turn for the worse.
I sucked out the old fluid from the reservoir and put in the new, and had my one way valve tube stuck on the brake valve thingy (I suck with mechanic terminology) with the 10mm wrench ready to turn the valve and start the bleeding process. I thought I made the quarter turn ok to open it up, but I didn't see any fluid going into the tube when I started applying pressure to the brake lever. Turns out it didn't open at all. With just one turn attempt the nut on the valve was basically just deteriorating under the pressure of the wrench. I don't know if the previous mechanic wrenched it down ungodly tight, if the thing is just corroded beyond help, or a combination of both.
Really hard to get pics since I don't have any fancy macro-capable cameras but here's a couple with as little blur as I could manage:
With one turn attempt the wrench just bit into the threading and started wearing off the nut corners like it was nothing. I didn't take it from a bad angle or with excessive pressure. It just kind of gave way with the one turn attempt. The nut is such now that the wrench doesn't feel snug enough to turn without just wearing it away even more. Is the part still usable? Should I get some lockable pliers and just force that thing open? Should I try WD-40 or some other solvent first to help get it open or could that do bad things to the brake components?
Thanks so much in advance