Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: philward on January 18, 2015, 08:37:09 PM
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Trying to get some pressure at the lever for the last few weeks. Had pressure but back to the lever - essentially don't brake the bike!
Tried all tips - tapping lever/caliper, bleeding at every junction, lifting the caliper to highest point, etc, Tried back filling with a sringe but will not force fluid up line (with lever held in) - sringe solid. Same when I try to push the piston back.
I now can't any pressure!
This has made me doubt my master cylinder rebuild!
I've stripped the master cylinder now. The cylinder has 2 holes in the bottom of the reservoir but 1 is blind while the other goes through to the cylinder. (When I shine a torch down the cylinder, I can see the 1 hole).
Question is - should both hole go through to the cylinder. I'm asking in case one's blocked (as I say, when I look down the cylinder, there doesn't seem to be a hole that side).
I'm grasping at straws I know but getting desperate.
Phil
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Yes. It's blocked. 1 hole in the MC is tiny. It needs poked with a strand of wire brush or something that fits the hole.
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if you back bleed,don't hold the lever in,
fill the caliper(s) and connect the pipes ,then press the piston in and force the fluid up to the MS,
normally works 99%
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Thanks - tiny hole was blocked and just cleared it with 1mm drill. Hopefully will be able to get pressure! Will try tomorrow night as been on it for 3 hours today
Thanks guys
Phil
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It is better to blow them out with a airline ;)
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With that little hole unblocked, brakes bleed with great lever pressure within 5 mins! Another lesson learned
Phil