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Discussion Starter · #1 ·
new kid on block here !!!!!!! i gots me a lil problm. master cylinder on a 1990 300 fourtrax 4x4. front wheel cylinders not getting fluid. rebuilt master cyl. but cant getsystem to bleed out. what am i doing wrong ? any help will b rewarded !!!!!1
 

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new kid on block here !!!!!!! i gots me a lil problm. master cylinder on a 1990 300 fourtrax 4x4. front wheel cylinders not getting fluid. rebuilt master cyl. but cant getsystem to bleed out. what am i doing wrong ? any help will b rewarded !!!!!1
Have you tried gravity bleeding? Fill the reservoir with brake fluid. Then loosen both bleeder screws and let it drain while keeping the reservoir full at all times. Let it drain until you have a steady stream of brake fluid draining out each side. It may take a few minutes before fluid starts draing out the bleeding screws. Make sure you don't let the reservoir get even close to being low or it will get air back into it. When you get a steady stream, tighten the bleeder screws back up and see if you have a full pedal or lever. If not you may have to finish bleeding them by pumping the lever.

By the way, make sure you have the brake shoes adjusted up on both sides, first, or you will never be able to get a full pedal or lever.
 

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Oh, and welcome to the forums.
 

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Discussion Starter · #5 ·
i tried gravity . i tried pump and hold then release bleeder and nothing. lines are open when i replaced master. blew air through em.
 

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have bled brakes on lots o vehicles . but nvr a 4x4. figrd it b same as veh.
Pretty much the same as a vehicle, but usually a little harder to get all the air out. Are you saying that you tried gravity bleeding and no fluid would drain out? How long did you wait? It usually takes a while for the fluid to start coming through the bleeder screws. If you can blow air through them, there shouldn't be any reason why they won't gravity bleed. Anyway, you could try this method. It would have to work, I believe, because it would draw the fluid through the lines with the vacuum pump.

 

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I believe there's a junction block, up under the front fenders, where the metal brake line splits into two metal lines. If I remember right, there's a bleeder screw in this junction block. You might be able to bleed it there, first. That would get the fluid down that far and it might would gravity bleed the rest of the way down.

By the way, there's a round rubber seal type thing with a hole in it down in the bottom of the reservoir. Sometimes you can take your thumb and push on that rubber thing at the same time you're pumping the lever and it will push the fluid down into the lines quicker. Just push down on it with your thumb while pulling the lever. Then when you release the lever, lift your thumb up off the rubber thing, so that more fluid will go down into the hole. Just keep doing this at the same time you are pumping the lever.
 

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Welcome to the forums!!!!!!!!!!!!!!!!
 
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