Question about 2002 Yamaha YZ 426 F

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Bleading braks on gpz 400

I need to no how to blead the front brakes on my gpz 400 can you help.its a amercan inport

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To some this meight sound like a backyard plan but I promise you this works.
Get hold of a windscreen washer bottle from a car that the pump is still working,throw some brake fluid in the bottle,bleed some excess air out of the pipe,attach the pipe to the bleeding nipple on the brake calliper (this is a reverse bleeding method),the cap where you fill the brake fluid on the bike reservoir must be open,this method works best when you are two,switch on the little pump and then open the bleeding nipple on the calliper,observe the bubbles in your reservoir,as soon as the bubles stop,close the bleeding nipple first and then switch of the lectric pump,the brake fluid may spill out of the resoirvoir so take great care when performing this task.
If you can not find a windscreen washer bottle,you can also use one of those little mechanical oil cans.

Try this we even use this method when bleeding clutches on big trucks,and vehicle brake systems,it works 100%.

Posted on Jan 21, 2009

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Very simple. hold brake lever and crack open bleeder screw on caliper. when it goes down, tighten screw. do this multiple times. make sure to tighten bleeder before releasing brake lever.

Posted on Jan 19, 2009

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2 Answers

What is the proper way to bleed the brakes on this bike with ABS?


Hi,I had a yamaha fj1200 that had abs and when bleading the brakes I just blead the brakes in the normal way,I found that it makes it easyer to blead,open resouveor cap and top up and put a rag around the resouvor to protect any paintwork then get a bungie tie and slowly pump the brake lever slowly as not to creat lots of air bubbles in the system,then rap the bungie around the lever and handle bar to keep the lever pulled in,then go to the back caliper and put the tube in a glass and fill with brake fluid untill it covers the end of the tube,put the other end on the blead nipple a slowly open the nipple just so you can see the fluid coming out,when it stops flowing tighten the blead nipple and do this again untill all the air is out and you have clean fluid coming through,the do the same to the front,job done.
there is a self bleading tube with a valve on the end so that the air dose not go back in the system,there is also a brake bleading system on the market that is a self bleading system where you have tube that connects to the resouvor with its own lid, and a tube that runs from that to a bottle which you put the brake fluid in,and a tube runs from that to a connector like the one that is on a foot pump,that connects to a wheel wich supplies the presure to push the fluid through the system,so with this system all you have to do is open the blead nipple and lock it again when done.
I hope this was some help.
Ive explaned it becouse not every one knows how to do this,so sorry if im telling you how to suck eggs.

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I know there is ABS in that vehicle, you might still have air in the ABS unit, you will need to get a manual that shows you the correct procedure to bleed the brakes. Master installed u need to start the bleed on the bench, then move to the ABS unit then to the individual calipers and/or wheel cylinders if equipped. I think there is a certain way to do it to avoid incorrect bleeding.

But i have also seen bad master cylinders brand new in the box.

Good Luck.

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Not a good idea, if vehichle has abs then you can't blead it properly and even if it did'nt without bleading system, air in lines can cause brake failure.

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