Front brake installation/bleeding problem - Wrist Twisters
 
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post #1 of 17 Old 06-13-2011, 01:52 PM Thread Starter
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Front brake installation/bleeding problem

I'm hoping some of you more experienced wrenchers can help me. I haven't ridden in 8 months because I foolheartedly decided to extensively upgrade my bike. I'm down to one last procedure and I can ride again, but my lack of experience with brakes is tripping me up.

I rebuilt my front master cylinder and both calipers. I also installed new galfer brake lines. The whole system was dry except for the brake fluid I used to assemble the M/C and calipers. I tried to fill/bleed the system yesterday and I am having trouble. I was able to get the fluid to flow from the bleed valves and get air out. I bled the calipers until no air came out but the lever still went all the way to the grip and it didn't push the caliper pistons. The lever felt kind of funny too. If i pulled the lever fast it came back with almost no resistance all the way but if i pulled it slowly, i gave a little feedback but it was kind of jerky and still came back all the way. I took it apart and inspected everything and it was all in spec. The piston cups are new and they look undamaged.

Any ideas what the issue could be? The caliper pistons might be pushed into the calipers all the way. Would this prevent them from being actuated by the lever? Should I use air to push them toward the rotors? Would it help to fill the calipers as much as possible before connecting the lines?

Any help would be much appreciated.

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post #2 of 17 Old 06-13-2011, 05:49 PM
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sounds like there is still air in the system. what i like to do is let the bike sit for a night with the handle bars turned full left so the master cylinder is at the highest spot.

then in the morning come out take off the resivore cap. and just giggle the break lever... dont push it in to far just giggle, i bet some air bubbles come out. Then blead the air out of the calipers as air has probably accumulated at the high point where the bleeder screws are.

Question are you using the standard, pull lever in untill resistance, open bleeder screw, close bleeder screw, let lever out method?

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post #3 of 17 Old 06-13-2011, 06:14 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
Question are you using the standard, pull lever in untill resistance, open bleeder screw, close bleeder screw, let lever out method?
Yep. That's what I was doing....for hours....

I might try the vacuum from the master cylinder method if i fail again tonight.

Thanks for the advice. I'll try it.

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post #4 of 17 Old 06-13-2011, 06:42 PM
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Quote:
Originally Posted by nd4spdbh View Post
Question are you using the standard, pull lever in untill resistance, open bleeder screw, close bleeder screw, let lever out method?
I usually use vacuum at the bleeder screw to get the lines full, then use the above to get a nice firm lever.

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post #5 of 17 Old 06-13-2011, 06:45 PM
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post #6 of 17 Old 06-13-2011, 07:28 PM
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if there is a harbor freight tools near you, you can get a nice pneumatic brake bleeder for $30, or a mitvac for $35

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post #7 of 17 Old 06-14-2011, 09:12 PM
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...keep at it, it takes a LONG time without a vac. And I used a full bottle of fluid (dumping into a jar, tubes down into fluid to see bubbles) before I got any progress.

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post #8 of 17 Old 06-14-2011, 09:59 PM
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get the right size clear piece of tube about 2 ft long n just use ur mouth to suck brake fluid out of the caliper... this is the method i used when i replaced my front lines on my 919, and thats after i completely blew out the entire system with compressed air, had a firm lever in less than 5 min.

then i let it sit over night to get the final bubbles out of both calipers and the MC.

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post #9 of 17 Old 06-15-2011, 05:43 AM
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Quote:
Originally Posted by nd4spdbh View Post
get the right size clear piece of tube about 2 ft long n just use ur mouth to suck brake fluid out of the caliper... this is the method i used when i replaced my front lines on my 919, and thats after i completely blew out the entire system with compressed air, had a firm lever in less than 5 min.

then i let it sit over night to get the final bubbles out of both calipers and the MC.
Just don't swallow it

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post #10 of 17 Old 06-15-2011, 10:17 AM
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Quote:
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Just don't swallow it
thats why you use a clear tube!

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post #11 of 17 Old 06-15-2011, 12:35 PM
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Quote:
Originally Posted by nd4spdbh View Post
get the right size clear piece of tube about 2 ft long n just use ur mouth to suck brake fluid out of the caliper... this is the method i used when i replaced my front lines on my 919, and thats after i completely blew out the entire system with compressed air, had a firm lever in less than 5 min.

then i let it sit over night to get the final bubbles out of both calipers and the MC.
How many inches of mercury can you suck?

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post #12 of 17 Old 06-15-2011, 01:12 PM
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i can suck a golf ball through a garden hose! hahahha

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post #13 of 17 Old 06-15-2011, 02:24 PM
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Quote:
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i can suck a golf ball through a garden hose! hahahha

...and it makes his lever firm

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post #14 of 17 Old 06-15-2011, 02:43 PM Thread Starter
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Quote:
Originally Posted by marylandmike View Post
Just don't swallow it
Do they make mint flavored brake fluid?

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post #15 of 17 Old 06-15-2011, 02:46 PM
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Quote:
Originally Posted by nd4spdbh View Post
i can suck a golf ball through a garden hose! hahahha
twss

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post #16 of 17 Old 06-15-2011, 03:09 PM
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Quote:
Originally Posted by marylandmike View Post
...and it makes his lever firm
Quote:
Originally Posted by ekovach View Post
Do they make mint flavored brake fluid?
Quote:
Originally Posted by g00gl3it View Post
twss
<3 wristtwisters community humor!

all joking asside, the clear tube really does work woulda taken me ages to manually pump the lever to push the fluid down to the calpier.

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post #17 of 17 Old 06-18-2011, 04:59 PM Thread Starter
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Problem solved! Thanks for all the advice.

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Quote:
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.
Pics of the upgrades?
https://www.wristtwisters.com/attachm...6&d=1308437249

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