The SOHC/4 World Tour is in under way.
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After working with the caliper as stated before, I continually squeezed the lever until the piston popped out , but it never let go and locked up my wheel, so I took it back off and used a C-clamp to push it back in. I must have messed up when I did that because now I cannot get it to budge what so ever.
Took it off and just squeezed the lever, and realized that there wasn't much fluid flying out. I could put my finger over and feel the air push out, but no real gush of fluid like I thoght would shoot out.. Is the line clogged? Also noticed the brake fluid was of a brown coloration.
As far as the bleeder valve I tried the six point socket method- nothing. I went as far as tighteng the bleeder in the vice, and it never broke free.. Concerning the penetrating oil; is there a brand name, specifics??
As far as the master cylinder, it did bubble up, and even shot out a time or two when I released the lever,
so I assumed everything was in order, but now I think there is a hefty amount of air in the line seeing as how I was pumping away at it and seeing no break fluid fly out of the brake line- that feeds into the caliper..
At the bottom of the master cylinder reservoir, there are two holes to feed fluid to the system and allow air to get out. The one closest to the brake hose has a very tiny hole at the bottom. If you slowly move the brake lever, bubbles should pop out those holes, provided there is still air in the lines/ system and you have given them time to rise to that high point. If that tiny hole is blocked, forget about getting the brakes to work right. That hole is quite tiny, something like .010 inch or so. Bigger is NOT better. So, don't just drill it out. Once you have the master working correctly and the system bled of air then simply keep adding fluid and pumping out the caliper piston until it pops free of the caliper body.
So, you are saying the ram cylinder and longer handle of the grease gun make more PSI than the Master on the bike?Any quantification of the pressure difference?Cheers,
Just want to throw my $.02 in on this one. I had read about the air compressor method of freeing a frozen piston. Figuring I needed a compressor around the shop, I went and bought one for $200.00. Got it home, hooked it up, got the caliper, put 2 & 2 together and got…NOTHING. It didn’t even budge. I worked on it for about an hour each of the next two days. I was bummed. So I jumped on here and found this thread. The next day I called a few local industrial bearing and supply houses to find a 10mm grease fitting and borrowed a grease gun from the maintenance shop at work. Took it home threaded it up, pumped it once, pumped it twice, DONE! Wow, that was easy. Moral of the story: air compressor ($200) + 2 hours = nothing; 10mm fitting ($.25) + 30 seconds = success.Yes, the fitting only cost 25 Cents. What a deal. But since then I’ve noticed most auto parts sell an assorted pack of metric grease fittings for a couple of bucks. I’d say it’s worth getting the right fitting.