Brake problem, lack of pressure

rhoads157 · 05-21-2007, 07:20 AM

Hello to all. New guy here, I have a 1998 YZ250 that I just recently picked up and I am doing some rebuilding to make it a trail bike so that I can ride with my 8 yr old son.
My problem is with the brakes. I have changed the fluid and bled the line several times but I can not get constant pressure out of the lever.
It is fine for 4 or 5 squeezes but then it totally looses pressure. Also, If I hold the lever all the way in for a few seconds the pressure will go away and of course, no front brakes.

Any ideas as to what I need to do? Can't be too complicated. Maybe replacing a part......but what?
Thanks a lot and hopefully I can give back to the forum in the future.

David

tigmaster · 05-21-2007, 08:42 AM

almost sounds like a leaky seal around the piston, but you would think u would see fluid. you are sure that you got all the air out. the process should be bleeding new fluid through the old, putting the bleeder cap back in and then while the reservoir cap is still off, pump the handle lots and lots of times until you dont see any air bubbles come up out of the line. then let it sit for a few minutes and come back and check it and if you see no more bubbles you're good to put it back together. also an old trick for better brakes is taking a zip-tye and pulling the brake lever back and strapping your breaks on the night before the ride. so if you holding down the handle causes them to lose pressure then something important is wrong. the reservoir had a rubber seal right? checked the line? noticed any kinks or weird bubbles in the line? if none of these are it we can always dig in a little deeper, just trying to knock out the basics

wr250f95 · 07-22-2007, 06:15 PM

^^^^^ correct! you hit it on the head! my ttr had this problem, this was what was wrong.

tigmaster · 07-22-2007, 07:16 PM

which of my suggestions was the prob.

wr250f95 · 07-22-2007, 07:47 PM

the 1st only one i read lol.

tigmaster · 07-23-2007, 07:09 AM

man, im just full of answers lol.

05-21-2007, 07:20 AM	#1 (permalink)
rhoads157 C Rider Join Date: May 2007 Location: Avon, Indiana Posts: 6 iTrader: (0)	Brake problem, lack of pressure Hello to all. New guy here, I have a 1998 YZ250 that I just recently picked up and I am doing some rebuilding to make it a trail bike so that I can ride with my 8 yr old son. My problem is with the brakes. I have changed the fluid and bled the line several times but I can not get constant pressure out of the lever. It is fine for 4 or 5 squeezes but then it totally looses pressure. Also, If I hold the lever all the way in for a few seconds the pressure will go away and of course, no front brakes. Any ideas as to what I need to do? Can't be too complicated. Maybe replacing a part......but what? Thanks a lot and hopefully I can give back to the forum in the future. David

05-21-2007, 08:42 AM	#2 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	almost sounds like a leaky seal around the piston, but you would think u would see fluid. you are sure that you got all the air out. the process should be bleeding new fluid through the old, putting the bleeder cap back in and then while the reservoir cap is still off, pump the handle lots and lots of times until you dont see any air bubbles come up out of the line. then let it sit for a few minutes and come back and check it and if you see no more bubbles you're good to put it back together. also an old trick for better brakes is taking a zip-tye and pulling the brake lever back and strapping your breaks on the night before the ride. so if you holding down the handle causes them to lose pressure then something important is wrong. the reservoir had a rubber seal right? checked the line? noticed any kinks or weird bubbles in the line? if none of these are it we can always dig in a little deeper, just trying to knock out the basics __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

07-22-2007, 06:15 PM	#3 (permalink)
wr250f95 Super Moderator Join Date: May 2007 Location: New Mexico Posts: 7,832 iTrader: (1)	^^^^^ correct! you hit it on the head! my ttr had this problem, this was what was wrong. __________________ "LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING'...HOLY S**T... WHAT A RIDE!" this, is why I ride.

07-22-2007, 07:16 PM	#4 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	which of my suggestions was the prob. __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

07-22-2007, 07:47 PM	#5 (permalink)
wr250f95 Super Moderator Join Date: May 2007 Location: New Mexico Posts: 7,832 iTrader: (1)	the 1st only one i read lol. __________________ "LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING'...HOLY S**T... WHAT A RIDE!" this, is why I ride.

07-23-2007, 07:09 AM	#6 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,526 iTrader: (1)	man, im just full of answers lol. __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

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