Brake bleed isn’t working

Related:
Question
Hydraulic Disc Brakes
finlayy
Profile picture for user finlayy
Posts
10
Joined
4/20/2020
Location
GB
finlayy
Edited Date/Time 4/24/2020 8:35pm

|
bermslapper69 4/20/2020 7:57am
4/20/2020 7:57am
finlayy wrote:
[img]https://p.vitalmtb.com/photos/forums/2020/04/20/9466/s1200_454C3FDB_0995_4565_9BF6_F3471643993E.jpg[/img]

have you tried bleeding your brakes instead of your breaks?
1
Scrub
Profile picture for user Scrub
Posts
231
Joined
9/3/2009
Location
Elk Grove/Truckee, CA US
Fantasy
38th
Scrub 4/20/2020 8:45am
4/20/2020 8:45am
Did you take the cable out before putting the fluid in there?
finlayy
Profile picture for user finlayy
Posts
10
Joined
4/20/2020
Location
GB
finlayy 4/20/2020 8:57am
4/20/2020 8:57am
Scrub wrote:
Did you take the cable out before putting the fluid in there?
They originally had fluid in them then I changed the cable over and most the fluid came out.
Nic Cotton 4/20/2020 9:50am
4/20/2020 9:50am
Did you replace the olive and barb for the new hose before reattaching to the lever? (see photo)




If you did replace both olive and barb then can you describe exactly where the leak is coming from? Photos would help, as would more info on the type of brake and maybe some info on how you bled the system. Is the leak between the lever body and hose interface? Is it at the bleed port on the lever? Does the lever have a cap with a seal around it (like hope does)?
finlayy
Profile picture for user finlayy
Posts
10
Joined
4/20/2020
Location
GB
finlayy 4/20/2020 10:47am
4/20/2020 10:47am
Nic Cotton wrote:
Did you replace the olive and barb for the new hose before reattaching to the lever? (see photo) [img]https://p.vitalmtb.com/photos/forums/2020/04/20/9472/s1200_barb.jpg[/img] If you did replace both olive and...
Did you replace the olive and barb for the new hose before reattaching to the lever? (see photo)




If you did replace both olive and barb then can you describe exactly where the leak is coming from? Photos would help, as would more info on the type of brake and maybe some info on how you bled the system. Is the leak between the lever body and hose interface? Is it at the bleed port on the lever? Does the lever have a cap with a seal around it (like hope does)?
I have put a new olive and barb in but the leak is coming from the Seal circles in the picture

I do a standard bleed by pushing new fluid in from the Caliper and the old fluid will come out of the bleed port on the lever into a syringe.
finlayy
Profile picture for user finlayy
Posts
10
Joined
4/20/2020
Location
GB
finlayy 4/20/2020 10:48am
4/20/2020 10:48am
Nic Cotton wrote:
Did you replace the olive and barb for the new hose before reattaching to the lever? (see photo) [img]https://p.vitalmtb.com/photos/forums/2020/04/20/9472/s1200_barb.jpg[/img] If you did replace both olive and...
Did you replace the olive and barb for the new hose before reattaching to the lever? (see photo)




If you did replace both olive and barb then can you describe exactly where the leak is coming from? Photos would help, as would more info on the type of brake and maybe some info on how you bled the system. Is the leak between the lever body and hose interface? Is it at the bleed port on the lever? Does the lever have a cap with a seal around it (like hope does)?
finlayy wrote:
I have put a new olive and barb in but the leak is coming from the Seal circles in the picture [img]https://p.vitalmtb.com/photos/forums/2020/04/20/9473/s1200_CAEC9704_0F85_4160_A3C2_4D73CE2E785D.jpg[/img] I do a standard...
I have put a new olive and barb in but the leak is coming from the Seal circles in the picture

I do a standard bleed by pushing new fluid in from the Caliper and the old fluid will come out of the bleed port on the lever into a syringe.
Also my my breaks are Shimano BR-M615
luisgutrod 4/20/2020 10:58am
4/20/2020 10:58am
finlayy wrote:
I have put a new olive and barb in but the leak is coming from the Seal circles in the picture [img]https://p.vitalmtb.com/photos/forums/2020/04/20/9473/s1200_CAEC9704_0F85_4160_A3C2_4D73CE2E785D.jpg[/img] I do a standard...
I have put a new olive and barb in but the leak is coming from the Seal circles in the picture

I do a standard bleed by pushing new fluid in from the Caliper and the old fluid will come out of the bleed port on the lever into a syringe.
if you push fluid towards the lever (from the caliper) and the system is full and "closed" (as in no syringe in the lever, or you are pushing the syringe) you will blow those seals/gaskets..open that up and check everything is in place and not broken.. and re-bleed..cheers..
TEAMROBOT
Profile picture for user TEAMROBOT
Posts
1422
Joined
9/2/2009
Location
Los Angeles, CA US
Fantasy
645th
TEAMROBOT 4/20/2020 12:43pm
4/20/2020 12:43pm Edited Date/Time 4/20/2020 12:45pm
Eye think ewe mite have problems with the weigh yore bleating yore breaks it's better two bleat fromme the lever down to the CalPERS
2
finlayy
Profile picture for user finlayy
Posts
10
Joined
4/20/2020
Location
GB
finlayy 4/21/2020 5:12pm
4/21/2020 5:12pm
finlayy wrote:
I have put a new olive and barb in but the leak is coming from the Seal circles in the picture [img]https://p.vitalmtb.com/photos/forums/2020/04/20/9473/s1200_CAEC9704_0F85_4160_A3C2_4D73CE2E785D.jpg[/img] I do a standard...
I have put a new olive and barb in but the leak is coming from the Seal circles in the picture

I do a standard bleed by pushing new fluid in from the Caliper and the old fluid will come out of the bleed port on the lever into a syringe.
luisgutrod wrote:
if you push fluid towards the lever (from the caliper) and the system is full and "closed" (as in no syringe in the lever, or you...
if you push fluid towards the lever (from the caliper) and the system is full and "closed" (as in no syringe in the lever, or you are pushing the syringe) you will blow those seals/gaskets..open that up and check everything is in place and not broken.. and re-bleed..cheers..
What happens if I’ve blow the seals as even if I bleed it from the lever to the calliper it still leaks from the Seals on the lever?
P_BATEMAN
Profile picture for user P_BATEMAN
Posts
7
Joined
4/19/2020
Location
NYC, NY US
P_BATEMAN 4/22/2020 8:55am
4/22/2020 8:55am
You used DOT fluid didn't you. Take that cover off and inspect the seal.
2
Big Bird
Profile picture for user Big Bird
Posts
2307
Joined
2/1/2011
Location
Oceano, CA US
Big Bird 4/22/2020 6:00pm
4/22/2020 6:00pm
P_BATEMAN wrote:
You used DOT fluid didn't you. Take that cover off and inspect the seal.
You and your first things first mentality. Logic strikes again.
Big Bird
Profile picture for user Big Bird
Posts
2307
Joined
2/1/2011
Location
Oceano, CA US
Big Bird 4/22/2020 6:11pm
4/22/2020 6:11pm
P_BATEMAN wrote:
You used DOT fluid didn't you. Take that cover off and inspect the seal.
Ali Clarkson has experimented quite successfully with using Shimano Saint levers matched up to Magura callipers using standard mineral oil.

But If so, total and thorough reflush, Mineral Oil Only!
P_BATEMAN
Profile picture for user P_BATEMAN
Posts
7
Joined
4/19/2020
Location
NYC, NY US
P_BATEMAN 4/22/2020 7:04pm
4/22/2020 7:04pm
P_BATEMAN wrote:
You used DOT fluid didn't you. Take that cover off and inspect the seal.
Big Bird wrote:
Ali Clarkson has experimented quite successfully with using Shimano Saint levers matched up to Magura callipers using standard mineral oil. But If so, total and thorough...
Ali Clarkson has experimented quite successfully with using Shimano Saint levers matched up to Magura callipers using standard mineral oil.

But If so, total and thorough reflush, Mineral Oil Only!
I loved her first album though I find country to be a bit reductionist. Phil Collins is more my taste.

You can run mineral oil against DOT seals but not the other way around.

I've never tried human blood to replace magura blood as I think it would boil too low, the smell would be heavenly though.
4
1
Big Bird
Profile picture for user Big Bird
Posts
2307
Joined
2/1/2011
Location
Oceano, CA US
Big Bird 4/22/2020 8:14pm
4/22/2020 8:14pm
Mixn' is bad. M'cay.
1
TEAMROBOT
Profile picture for user TEAMROBOT
Posts
1422
Joined
9/2/2009
Location
Los Angeles, CA US
Fantasy
645th
TEAMROBOT 4/22/2020 9:44pm
4/22/2020 9:44pm
So pumped that Patrick joined our conversation. I'd love to see his business card.
1
Eoin
Profile picture for user Eoin
Posts
375
Joined
3/6/2015
Location
FR
Fantasy
53rd
Eoin 4/23/2020 12:09am
4/23/2020 12:09am
Nice to see I'm not the only one losing my mind during the lockdown
2
finlayy
Profile picture for user finlayy
Posts
10
Joined
4/20/2020
Location
GB
finlayy 4/24/2020 5:27am
4/24/2020 5:27am
P_BATEMAN wrote:
You used DOT fluid didn't you. Take that cover off and inspect the seal.
Big Bird wrote:
Ali Clarkson has experimented quite successfully with using Shimano Saint levers matched up to Magura callipers using standard mineral oil. But If so, total and thorough...
Ali Clarkson has experimented quite successfully with using Shimano Saint levers matched up to Magura callipers using standard mineral oil.

But If so, total and thorough reflush, Mineral Oil Only!
If I replace the lever as the seals are gone could I use a different lever with the same calliper that’s on my bike?
skypig
Profile picture for user skypig
Posts
58
Joined
1/17/2019
Location
AU
skypig 4/24/2020 5:34pm
4/24/2020 5:34pm
finlayy wrote:
If I replace the lever as the seals are gone could I use a different lever with the same calliper that’s on my bike?
It should work no problems.
If you did use DOT fluid, which damaged the seals in the lever (Master Cylinder), then the seals in the calliper might be affected.
I have more experience with motorcycles. The size of the piston affects the “feel”.
If the lever is designed for a 2 piston calliper, it might have a lot of lever movement with a 4 piston calliper - for EG.

If it was me, I’d consider shopping around for a complete XT 2 piston set up.
I’ve spent hours and hours trying to get brakes working to my satisfaction - then found a pre bled complete set up very reasonably priced on the net - bolt it on - perfect (Sometimes, you have to shorten the line - look for instructions online)
1
luisgutrod 4/24/2020 8:35pm
4/24/2020 8:35pm
P_BATEMAN wrote:
You used DOT fluid didn't you. Take that cover off and inspect the seal.
Big Bird wrote:
Ali Clarkson has experimented quite successfully with using Shimano Saint levers matched up to Magura callipers using standard mineral oil. But If so, total and thorough...
Ali Clarkson has experimented quite successfully with using Shimano Saint levers matched up to Magura callipers using standard mineral oil.

But If so, total and thorough reflush, Mineral Oil Only!
finlayy wrote:
If I replace the lever as the seals are gone could I use a different lever with the same calliper that’s on my bike?
Yes but seals are available parts usually
2

Post a reply to: Brake bleed isn’t working