Doc's Anything Goes
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Say no to scooter abuse
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Post by jct842 on Jun 23, 2012 10:52:45 GMT -6
2 weeks ago I bought a new front master cyl. when I put it on and bled it out I noticed the brake line was nicked and a crack was started. I got a new brake line, put it on last night and for the life of me I can not get it to pump up. It is like the piston cup has collapsed or just not sealing. It was slow bleeding when I first installed it but now it just will do nothing. It appears that I do have all the air out of the line and I do have fluid in the new line but just can not get pressure. A month ago I had the rear caliper off my majesty and after install I had it bled in 5 min, this one sucks. I am going to call parts for scooters monday am and get a new one coming. This is on the 50cc tank I just bought to give a friend. john
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Scooter Doc
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Post by sprocket on Jun 23, 2012 15:38:36 GMT -6
Could be bad O rings on the plunger...
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Doc's Anything Goes
Currently Offline
Say no to scooter abuse
Posts: 3,873
Likes: 156
Joined: Mar 31, 2010 19:07:16 GMT -6
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Post by jct842 on Jun 23, 2012 16:15:10 GMT -6
I have an idea that could be it. I really did not want to mess with the old one so I got this one/ Have to see what they say monday.
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Scooter Doc
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Post by rob63 on Jun 24, 2012 2:57:41 GMT -6
Sometimes it`s just a quirk of the sytem when you replace a pipe or cylinder. Try pumping the lever very slowly, it takes about 15 minutes to get some kind of pressure up but it should be noticeable. Or pull the lever in to the mid point of its travel and pop a cable tie around the lever and grip so it holds it in that position,. Leave it for an hour, when you come back it should`ve bled air back up through the master cylinder.
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