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Post by kmcnab1s on Apr 22, 2013 21:24:25 GMT -5
I just purchased a Shanghai 150cc scooter, and had to replace the front brake line. After replacing the line, I have had trouble getting the brake bled. Starting with the brake line all connected, if I remove the banjo bolt at the caliper, I get very little fluid out of the hose at that point from pumping the brake with the reservoir topped off. If I undo the entire line, I can get fluid to come out of the brake pump opening, but it seems that I have to put my thumb over the opening and get suction built up before significant amounts of fluid come out. Getting fluid out of the brake bleeder screw flat out doesn't happen. I know how to bleed brakes, but have never started with zero fluid in the system, so I don't know whether this is a common issue or not. It is possible that something is wrong with the brake pump but I am not sure. Like I said, some fluid is moving but I cannot get the fluid from the reservoir to circulate throughout the entire system. My next course of action is to get a brake bleeder pump, but they are $40 and I've never had to do this before. Suggestions?
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Post by JR on Apr 22, 2013 21:48:23 GMT -5
If you are not getting anything out of the bleeder valve you need to figure out why, is it somehow plugged?
A technique I have used is opening the valve with a clear hose on it going into a glass jar then pumping the brake adding fluid into the master cylinder as needed.
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Post by skuttadawg on Apr 22, 2013 22:14:58 GMT -5
Normally bleeding the brake lines is a 2 man job , one pumps the lever or pedal in a car , the other mans the valve . I have seen those one man kits but never used one . I think Harbor Freight ( a store many of us love to buy tools and goodies from like me ) has one unsure of the price . Did you note on the top of the master cylinder which type of brake fluid your system uses ? Many use DOT 3 but my scooters use DOT 4 . The long hose from the valve back into the master cylinder is a great idea as long as it does not pop up and stays submerged in the fluid reservoir . When installing a master cylinder in a car you first bleed it by using return hoses then attach the lines and bleed the lines one at a time . On a car I was taught to go in this order , right rear , left rear , right front , and left front by my instructor .
I only use a 6 point wrench or a flare wrench on cars . 12 point wrenches and sockets seem to be more likely to slip than 6 point
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Post by kmcnab1s on Apr 23, 2013 9:55:20 GMT -5
I'm using DOT 3, which is what it calls for. It is not the bleeder valve which is in question, as the fluid barely if at all makes it that far. I'm thinking it could be a problem with the brake pump. It won't pump much out of the reservoir itself until some suction is built up. Let me know any suggestions. Thanks!
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