I remember that oven test! Man...I feel old. Jim in NH (the first Jim in NH) SOHC4 #28
At 08:53 PM 1/5/04 -0700, Lloyd Oliver wrote: >Hello Eric, >I have to say I disagree with your use of Sil-Glide (or is it >Sil-Glyde). I tried this stuff thinking it was silicone. I posted an >oven test of this stuff a few years back that I can't locate right now >(Maybe its in the archives). If I recall correctly it began to run or >weep around or below 200 degrees F. I came to the conclusion that it >was a petroleum based product with added silicone and did not meet the >claims listed on the packaging. I had put some around the caliper >piston on one of the rebuilds. Sure enough, after a couple of panic >stops, the caliper heated up and the grease began to flow onto the >friction disk and onto the rotor. The good news is that the rotor >didn't heat up much anymore. The bad news is that the stopping power >was destroyed! And, folklore claims that you can never get all the >contaminants out of the friction pad with solvent. The next time it >heats up, what remains flows back to the surface and once again effects >your stopping power. > >But, the Honda manual says to use silicone on the caliper cylinder and >piston area that is not awash with brake fluid. I finally found a >product from Dow Corning labeled High Vacuum Grease. This is a Silicone >lubricant and the spec sheet lists impressive properties. My oven test >only went to 500 degrees F, but the stuff didn't look or function any >different at that temperature as it did in any other temperature >including 0 degrees in my freezer. Anyway, I use it on all my caliper >rebuilds to keep water off the puck side of the caliper and piston. > Actually, on any brake part metal exposed to the atmosphere or where >water can get to where friction is not needed. Don't put it on the >friction parts! I haven't had to rebuild one of these calipers yet. > But, if you don't replace the dot 3 brake fluid once every couple of >years, it will sludge up on the inside and keep the caliper piston from >moving away from the rotor. But, it takes from 5-10 years to do it. > Anyway, I did ten panic stops from 60mph in a row with the Dow grease >and never saw a sign of melting, seepage, creepage, weepage, or drool. > I'm happy with it! > >Incidentally, I also use this grease on the brake bleeder to help keep >it from rusting and freezing into the caliper. Works so far. But, >then, I also keep the water out with a rubber cap over it like it came >from the factory. > >I remember the 5.3 oz tube I have wasn't exactly cheap. However, it is >a lifetime supply for me. And, it seems to be perfect for this application. > >Cheers, >Lloyd SOHC4 #11 >72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F, >78 750F > > > >Eric Thierbach wrote: > > > rebuilt my caliper a couple years ago and used something called sil-glide > >from > >NAPA auto parts, lightly coat the caliper bore. Have also seen auto zone > >sell > >single use packets of this stuff. > > > >Haven't had a problem since > > > >Ride on. > > > >eric t. in KY > >sohc4#568 > >'71 CB750 > >
