Bleeding new brakes

[quads14589]

i just rebuilt my rear master cylinder and i need to bleed my breaks after im done puttin in some dot4 so how would i be able to bleed out my brakes without letting any air into the lines without a brakebleeder?

thanks

[Chin_Chilla]

This should help you.

Bleeding Your Brake (http://www.exriders.com/vbb/showthread.php?s=&threadid=263177)

[quads14589]

i did that and the fluid was just dripping outta it.

[blasterandy]

Get rubber peice of tubing.(note:You have to fluid in the resivoir to begin with) And put it on the metal nipple. Have someone pump the break pedal/lever. Then loosen the nipple (this will force the liquid out and any air bubles with it.)make sure it is pumping out into some break fluid pour about a little bit into a cup and the opposit end of the tube needs to be submerged in the fluid.Once this is done tighten the nipple back before you have the person let go of the lever/pedal. Just repeat this until you need to for each nipple. Go through one... one and a half resivoir full of fluid and that should be enough. Make sure you don't run out of fluid in the resivoir or else it will taken air thus making your work pointless. Hope this helped.:D

[Kaleigh]

just make sure there is always fluid in the reservoir.. at first you will only get a little of fluid to spit out.. just do it til you get a nice stream coming out with no bubbles..

are you closing the valve before you let go of the lever.. if not then you are sucking in air from the valve..

1 press lever/pedal and hold down..
2 open valve and let the pressure out..
3 close valve
3 release the lever/pedal
4 add more fluid

repeat until you get a steady stream with no bubble at all..

[quads14589]

i used the hose becuase my dad was reading in his old macanic book and it talked about the hose method and we used it and it worked good. now the brakes lock up good. ill just have to keep on pumping them while i am riding out in the woods.

[Kaleigh]

Originally posted by quads14589
i used the hose becuase my dad was reading in his old macanic book and it talked about the hose method and we used it and it worked good. now the brakes lock up good. ill just have to keep on pumping them while i am riding out in the woods.

why would you have to pumping your brakes in the woods??

[quads14589]

to build up pressure in my master cylinder

This is how i did it.

I opend the caliper thing up. Pushed the pedal down to push the air out then b4 i let the pedal back up i hold my thumb on the hole and let the pedal up. Then keep redoing that till its steady. I had to fill the rezivor a couple times to get it dune.

[Scro]

The single best investment in my opinion for bleeding brakes is a vacuum pump. It makes bleeding them a breeze.

Check out item number 270060536240 on ebay. There are several companies that make them though.

[blasterandy]

That works fine. But a vac. pump is a very good investment it takes doing one in 15min to all three in 15min or less

[Kaleigh]

honestly.. those tools are not needed.. the quad is small enough that one person should be able to it by themselves..

I did my rear brakes by myself in less then 5 mins..

[quads14589]

yah bleeded my brakes and all and there still isnt any pressure so there must be something wrong wit my caliper

[Kaleigh]

im just making sure.. but are you doing the right steps.. are you gettin a steady stream of fluid comin out the hole.. also you have to keep fluid in the res as your are working on it..

[quads14589]

yeah you are only susposed to crack the nipple open for only a few seconds and the close iy.

[Kaleigh]

ok cool. i was just checkin.. could be the system.. but still dont understand why you would have to pump the brake to get pressure.. i know you have to pump it after you put new pads on.. hmmm :confused:

how much fluid do you have in the res.. i topped mine right off so it overflowed when i put the cap on the res.. do you have the rubber piece that goes in the res..

[quads14589]

yes

[Kaleigh]

there could still be a little still left in the line.. other then that.. im just not sure.. i just keep scratching my head.. i wish i was there to help you..

[quads14589]

yah when we put new brake pads in the caliper we saw that the pistion was a little worn out so we are suspecting that might be a prob.

[blasterandy]

Try going through more fluid i think that the best way to ensure you get all the bubbles, out you need to watch the stream and you will feel the lever getting much tighter.

[quads14589]

we used a peice of pipe and it had no bubbles on it. i could press the brake lever down and try to push the quad and it wont move. then when i had it running and going up the driveway it didnt even wanna stop.

[Kaleigh]

when you had a steady stream started come out.. did you do it a couple more time to make sure??

[quads14589]

yeah ill bleed them again when i get home from school but u are only susposed to keep the nipple open for like 1 sec.

[blown331]

not sure if this was mentioned... but generally you want to start bleeding the brake farthest from the master cylinder first...

[exrider008]

all i do to blead my brakes is fill the resivor and then open the valve. just let them blead themselves and kepp the fluid full. then after you think all the air is out close the vavle.


u do have prake pads on right?

[JOEX]

Originally posted by quads14589
yeah ill bleed them again when i get home from school but u are only susposed to keep the nipple open for like 1 sec.
I don't think the amount of time is important. What is important though is do not release the pedal or lever until the valve is closed.

There could be an air bubble trapped somewhere in the line.

[blasterandy]

try like i said and some in the bottom of a bottle and then run one end of the hose into the fluid so it is submerged and then you can hold the nipple open for as long as you want and not worry about getting air back in the line some where i read that 2 resivoirs full plus some change is how much the line plus the ressie holds go through at least that much. And no you should hold the nipple open for about 4-6sec or until the stream starts to go thin.