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  #1  
Old 08-16-2004, 09:53 PM
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Default Changed the fluid in rear brake now it sucks

     

I poured out the old brake fluid out of my yz125s rear brake fluid cup holder(lol idk what its called)..now my rear brake isnt working so good after I dumped the oild fluid and put brand new fluid in it..is there somthing I did wrong./...??
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Old 08-16-2004, 09:54 PM
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Default Re: Changed the fluid in rear brake now it sucks

let the air out?:


im a noob but i would assume you need to take the air in there out hehehe... read your manual
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Old 08-16-2004, 10:00 PM
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Default Re: Changed the fluid in rear brake now it sucks

let the air out..what are u talking about that has nuthing to do with what im talking about..I dont have a manual cuz I bought my bike used..I gotta get a service manual so I can stop asking so many questions lol
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Old 08-16-2004, 10:04 PM
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Default Re: Changed the fluid in rear brake now it sucks

let the air that might by in the resevoir because it has to much pressure? i think thats wat k kid was trying to say, and nig sig kk
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Old 08-16-2004, 10:04 PM
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Default Re: Changed the fluid in rear brake now it sucks

he is talking about bleeding it. Thats what you need to do.
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Old 08-16-2004, 10:09 PM
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Default Re: Changed the fluid in rear brake now it sucks

when you see "noob"you should be expecting something thats not right on target... lol... im still reading and absorbing as most info as i can on doing whips and doh i ment taking care of the bikes...whips... hehe cant wait to master those
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Old 08-16-2004, 10:11 PM
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Default Re: Changed the fluid in rear brake now it sucks

Yeah Im in the same position as u....I just got my 1st big bike 2 weeks ago so everything on this bike is new to me...but Iv learned alot so far..
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Old 08-16-2004, 10:14 PM
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Default Re: Changed the fluid in rear brake now it sucks

yeah, this is what i was talking about on your other thread about the oil and brakes. you bleed the brakes. if there's air in the line the brake will be pretty spongy feeling and will work marginally at best.

-Z
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Old 08-16-2004, 10:22 PM
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Default Re: Changed the fluid in rear brake now it sucks

hehe i new i heard of this somewhere else
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Old 08-16-2004, 10:23 PM
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Default Re: Changed the fluid in rear brake now it sucks

The little cup is called a resevoir and yes you need to bleed the brake pump the brake peddle lightly 3 times and hold ,Open
bleeder on the Caliper (the thing on the rear disc rotor)push down on brake peddle until it stops (CLOSE BLEEDER WHILE HOLDING PEDDLE DOWN)if you don't hold peddle down while closeing bleeder it will pull air into caliper !
Repeat these steps slowly until you have clean fluid and no air coming out caliper ( do not let resevoir run dry of fluid)
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Old 08-16-2004, 10:28 PM
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Default Re: Changed the fluid in rear brake now it sucks

So I disconect the line goint towards the disc brake and start pumping the brake?..or do I disconect the line coming from the resovour and pump it?
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Old 08-16-2004, 10:33 PM
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Default Re: Changed the fluid in rear brake now it sucks

if you look on the rear caliper you'll see a little black rubber cap that covers the bleeder. you open the bleeder by turning the nut that's around it (i think it's an 8mm). what you do is first be sure that the res is full of fluid, then pump the rear brake and hold it down. with it held down, open the bleeder slowly and fluid will come out. when the rear brake travel stops (when it goes all the way down) close the bleeder. repeat the process (pump, hold, open bleeder, close bleeder) until no more air comes out. depending on where the air is in the line, it may take a while for it to show up, but one thing you can count on is as long as the brake feels soft, there's air in there. NOTE: as you go through the bleeding process you'll want to be sure that the res never gets empty ... keep brake fluid in there. if it gets empty then you'll just be pumping more air back into it and going in circles. also be sure that you close the bleeder completely before you let up on the brake, otherwise you'll suck air back into the line through the caliper.

the bleeder is labeled with #7 in this diagram from a 2000 yz125:



i hope that helps.

-Z

Last edited by psyklone393; 08-16-2004 at 10:52 PM.
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Old 08-16-2004, 10:35 PM
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Default Re: Changed the fluid in rear brake now it sucks

Quote:
Originally posted by mxrider
So I disconect the line goint towards the disc brake and start pumping the brake?..or do I disconect the line coming from the resovour and pump it?
i forgot to mention this. you will not be disconnecting any line ... read my post above and ask more questions if you have any. asking questions and waiting for answers can take a little bit of time, but it almost always saves time and headache in the long run.

-Z
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Old 08-16-2004, 10:48 PM
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Default Re: Changed the fluid in rear brake now it sucks

pysklone is the man!
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Old 08-16-2004, 10:50 PM
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Default Re: Changed the fluid in rear brake now it sucks

thanks alot man....U were a GREAT help...I will bleed my brakes tomrow and tell u how it goes.....Cuz when I hit 70mph today it didnt fell that good slowing down....
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Old 08-16-2004, 10:55 PM
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Default Re: Changed the fluid in rear brake now it sucks

Quote:
Originally posted by mxrider
...Cuz when I hit 70mph today it didnt fell that good slowing down....
yeah ... that has a tendency to get your attention. that's why i said this in the other thread:

Quote:
Originally posted by psyklone
cool, glad you got it worked out.

before you go riding full-tilt, be sure that brake line is properly bled so you don't reach for the brake when you really need it and come up with a hand full of nothing.

-Z


good luck man,

-Z
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Old 08-17-2004, 04:12 AM
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Default Re: Changed the fluid in rear brake now it sucks

Nice post Psyk. We should move this one to the KB!
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Old 07-20-2007, 06:01 PM
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Default Re: Changed the fluid in rear brake now it sucks

what would be wrong if you draineed the rear brake system completely and filled the res up with brake fluid and started pressing on the brake pedal and nothing happened? the res just stays full and thats that?
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Old 07-20-2007, 07:14 PM
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Default Re: Changed the fluid in rear brake now it sucks

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Originally Posted by camestr View Post
what would be wrong if you draineed the rear brake system completely and filled the res up with brake fluid and started pressing on the brake pedal and nothing happened? the res just stays full and thats that?
Good grief. Did you bother to see that this thread is three years old?

Ever bleed brakes before?
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  #20  
Old 07-20-2007, 07:17 PM
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looky here Re: Changed the fluid in rear brake now it sucks

Quote:
Originally Posted by Baron Von B View Post
Good grief. Did you bother to see that this thread is three years old?

Ever bleed brakes before?
no and no but i figured it out
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