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+--- Thread: brake fluid bleeding problems (/showthread.php?tid=72462)

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brake fluid bleeding problems - rajoana - 09-05-15

Hi guys,
            recently attempted to bleed by rear brakes, had some problem.

            there were tiny bubbles coming out non stop. realized the bleeding screw has some free play. So i went to get both of them changed.


even after changing the bleeding screws the problem of tiny bubbles appearing does not go away. Because even after changing the bleeding screws there is free play.


So Seems like the thread on the caliper or worn out or something like that.


Instead of changing the whole caliper any economical way of solving thing?






Re: brake fluid bleeding problems - sinto607276 - 09-05-15

Is it possible that the threads are goosed?
Try araldite

http://www.amazon.co.uk/s/?ie=UTF8&keywords=rapid+araldite&tag=hydrukspg-21&index=aps&hvadid=25376465367&hvpos=1t1&hvexid=&hvnetw=g&hvrand=18059465401194045981&hvpone=&hvptwo=&hvqmt=b&hvdev=m&ref=pd_sl_i5p7ykhij_b

Re: brake fluid bleeding problems - crickleymal - 09-05-15

Try some PTFE tape on the threads.

Re: brake fluid bleeding problems - rajoana - 09-05-15

thanks for the reply guys. This forums seems really active.


well ones i have tighten the screw its fine. I guess so no sign of leakage or anything.


the problem is while bleeding. So i guess instead of these sealants or tapes need to do something about the thread.


or were u guys suggesting that these could help while the bleeding screw is slightly loosen for bleeding?

Re: brake fluid bleeding problems - riedrider - 09-05-15

Quote:Try some PTFE tape on the threads.
This would be also my first recommendation. Wrap it around the thread of the bleeder nipple.
Or apply some ATE brake grease (common in Germany) or red rubber grease around the thread.

Re: brake fluid bleeding problems - rajoana - 09-05-15

ok will give that a try. thanks again. will keep u guys posted if it works.

Re: brake fluid bleeding problems - maxzer1500 - 09-05-15

Only open bleed screw as far as it needs to be to pass fluid, it might only be half a turn and you might feel a lot of pressure at the pedal to achieve this. Even if it's a one way bleed tube i always nip up the screw ( just enough, not fully ) while the pedal is still moving.

Re: brake fluid bleeding problems - fazersharp - 09-05-15

(09-05-15, 09:32 AM)maxzer1500 link Wrote: Only open bleed screw as far as it needs to be to pass fluid, it might only be half a turn and you might feel a lot of pressure at the pedal to achieve this. Even if it's a one way bleed tube i always nip up the screw ( just enough, not fully ) while the pedal is still moving.
That sounds good advice
I had exactly the same issue when I did my front so I gave up in the end and tightened hopfully not too much ( was quite tight in the end ) and then it stopped

Re: brake fluid bleeding problems - Punkstig - 10-05-15

As with max- sounds like you're opening the bleed screw too much!

Re: brake fluid bleeding problems - Deefer666 - 10-05-15

take your bleed pipe and did the end that you put on the bleed nipple in grease.... No attempt it again if no bubbles then it was an air leak between the bleed nipple and the pipe.

Re: brake fluid bleeding problems - rajoana - 24-05-15

(09-05-15, 09:32 AM)maxzer1500 link Wrote: Only open bleed screw as far as it needs to be to pass fluid, it might only be half a turn and you might feel a lot of pressure at the pedal to achieve this. Even if it's a one way bleed tube i always nip up the screw ( just enough, not fully ) while the pedal is still moving.


ok i have just tried this. No tiny air bubbles spotted. however still have that spongy feeling and bitting is just not enough no matter how hard i step the brake pedal.


could be the pump?





Re: brake fluid bleeding problems - rajoana - 24-05-15

was read through some other posts here abt rear caliper seizure is a common prob.


If yar piston in the caliper has seized what wld be the symtoms?


no braking at all?


or not enough bitting power like what i m experiencing.

Re: brake fluid bleeding problems - sinto607276 - 24-05-15

I would take off the caliper, leaving the pads in place and try pressing the brakes, if your pistons are ok they will push together then insert a flat object between the pads and push them back to allow you get them back over the disc, you might have to do this a few times to get them to work loose, then if that's working ok you can eliminate the pistons etc but I'm thinking they will be stuck and will need an overhaul Sad

And if that is the case, you'll want to read this thread
http://foc-u.co.uk/index.php/topic,16810.0.html

Re: brake fluid bleeding problems - rajoana - 24-05-15

(24-05-15, 03:05 PM)sinto link Wrote:I would take off the caliper, leaving the pads in place and try pressing the brakes, if your pistons are ok they will push together then insert a flat object between the pads and push them back to allow you get them back over the disc, you might have to do this a few times to get them to work loose, then if that's working ok you can eliminate the pistons etc but I'm thinking they will be stuck and will need an overhaul Sad

And if that is the case, you'll want to read this thread
http://foc-u.co.uk/index.php/topic,16810.0.html
right thanks for sharing. will try what said as well.

Re: brake fluid bleeding problems - Jules-C - 25-05-15

If you have removed the brake caliper it's quite common to end up with a bubble where the brake pipe comes out the top on the master cylinder and depending on the size of the bubble it can be almost impossible to get rid of by normal bleeding since it keeps returning the this high point in the system.  Sometime slackening the banjo bolt on the top the the master cylinder can let the bubble out but you risk letting more air in. 

If you unbolt the caliper from the bracket and the brake pipe guide from the swinging arm and tie it so brake pipe runs uphill from the master cylinder to the caliper and then bleed it you should get rid of the bubble.

Re: brake fluid bleeding problems - rajoana - 25-05-15

(25-05-15, 09:23 AM)Jules-C link Wrote:If you have removed the brake caliper it's quite common to end up with a bubble where the brake pipe comes out the top on the master cylinder and depending on the size of the bubble it can be almost impossible to get rid of by normal bleeding since it keeps returning the this high point in the system.  Sometime slackening the banjo bolt on the top the the master cylinder can let the bubble out but you risk letting more air in. 

If you unbolt the caliper from the bracket and the brake pipe guide from the swinging arm and tie it so brake pipe runs uphill from the master cylinder to the caliper and then bleed it you should get rid of the bubble.

Was abt to try this. Seems like the nut at the master pump is locked after putting on much more force the whole bracket broke instead.

Re: brake fluid bleeding problems - Jules-C - 25-05-15

That doesn't help.  Second hand footrest brackets are usually easy to find on fleabay etc.  It must've been really tight unless bracket already starting to crack after bike been dropped at some time.

Re: brake fluid bleeding problems - rajoana - 25-05-15

(25-05-15, 10:51 AM)Jules-C link Wrote:That doesn't help.  Second hand footrest brackets are usually easy to find on fleabay etc.  It must've been really tight unless bracket already starting to crack after bike been dropped at some time.


nah its really tight i have used all my body weight to loosen it.


anyways got the new bracket already. more work to do. guess will try WD 40 n hope it opens up.


1 thing i learn. If it doesn't open with a desend amt of force dun push it further. :rollin

Re: brake fluid bleeding problems - sinto607276 - 25-05-15

(25-05-15, 11:31 PM)rajoana link Wrote:nah its really tight i have used all my body weight to loosen it.


anyways got the new bracket already. more work to do. guess will try WD 40 n hope it opens up.


1 thing i learn. If it doesn't open with a desend amt of force dun push it further. :rollin

Have you tried tightening it more? (Just a small amount though) then try turning it left to loosen it??

failing that, a bit of heat may help you.

Re: brake fluid bleeding problems - rajoana - 26-05-15

(25-05-15, 11:37 PM)sinto link Wrote:[quote author=rajoana link=topic=16893.msg197085#msg197085 date=1432593072]


nah its really tight i have used all my body weight to loosen it.


anyways got the new bracket already. more work to do. guess will try WD 40 n hope it opens up.


1 thing i learn. If it doesn't open with a desend amt of force dun push it further. :rollin

Have you tried tightening it more? (Just a small amount though) then try turning it left to loosen it??

failing that, a bit of heat may help you.
[/quote]

Tried both way. Didn't  moved at all. Mostly i tried anti clock wise