Zero front Brake Pressure

How much fluid did you use trying the reverse bleed?
 
The fact that you haven't seen any improvement leads me to think something is wrong. First thought goes to the master, but why would it fail at exactly this time?

Sorry to ask this question: You didn't swap the calipers, did you? I.e. the bleed nipples would be at the bottom instead of the top. Not sure if this is even physically possible in this application, but it would make bleeding difficult
 
TwistedKestrel said:
The fact that you haven't seen any improvement leads me to think something is wrong. First thought goes to the master, but why would it fail at exactly this time?

Sorry to ask this question: You didn't swap the calipers, did you? I.e. the bleed nipples would be at the bottom instead of the top. Not sure if this is even physically possible in this application, but it would make bleeding difficult
Click to expand...
I am inclined to also agree. It seems to be the same result everytime even when I did the complete rebleeds. Theres the tiniest but of pressure compared to well, air, but nothing of value at all. And that nothing has changed anything is scaring me.

I didnt change the calipers but i changed the pistons (cleaned them), and replaced the dust seals all of them. Just new lines were added
 
Sorry again - by swap I mean accidentally switching the left and right calipers. Are the bleeders on the top side, or the bottom side?
 
Wyled said:
I am inclined to also agree. It seems to be the same result everytime even when I did the complete rebleeds. Theres the tiniest but of pressure compared to well, air, but nothing of value at all. And that nothing has changed anything is scaring me.

I didnt change the calipers but i changed the pistons (cleaned them), and replaced the dust seals all of them. Just new lines were added
Click to expand...
i'm wondering if you didn't rip the seal "O-RINGS" when you pushed the pistons back in the calipers. If it was me now riding is done i would pull the caliper back off and take it apart and double check the work
 
I've had a braided stainless line that had your symptoms. It turned out to have a hole in the liner but you couldn't see it. Swapping it for a crappy rubber line confirmed the issue was in the "better" part.
 
Sorry again - by swap I mean accidentally switching the left and right calipers. Are the bleeders on the top side, or the bottom side?
topside
 
ToSlow said:
i'm wondering if you didn't rip the seal "O-RINGS" when you pushed the pistons back in the calipers. If it was me now riding is done i would pull the caliper back off and take it apart and double check the work
Click to expand...
might as well, although there havent been any leaks from the pistons
 
GreyGhost said:
I've had a braided stainless line that had your symptoms. It turned out to have a hole in the liner but you couldn't see it. Swapping it for a crappy rubber line confirmed the issue was in the "better" part.
Click to expand...
really hope not but. did it leak brake fluid?
 
Wyled said:
really hope not but. did it leak brake fluid?
Click to expand...
Not obviously. I think it may have been wicking through the braid. In that case it was a hydraulic clutch but fundamentally similar. Days of head scratching and trying various options and finally resorted to part swapping to find the issue. Luckily the first part swapped was the winner.
 
HMMmmmmmmmmmmmmm
Two weeks and you guys still haven't figured it out. I don't think I would hire any of you to fix my brakes.
Hydraulic disc brakes is a pretty simple circuit, nothing complicated about it.

NO I AM NOT OFFERING ANY SUGGESTIONS
If you don't understand this simple circuit you have NO BUSINESS screwing around with it.
OP: Take the bike, or just the brakes, to someone that knows what they're doing. If you remove the setup and bring it to me, I'll bleed it for you.
 
bitzz said:
HMMmmmmmmmmmmmmm
Two weeks and you guys still haven't figured it out. I don't think I would hire any of you to fix my brakes.
Hydraulic disc brakes is a pretty simple circuit, nothing complicated about it.

NO I AM NOT OFFERING ANY SUGGESTIONS
If you don't understand this simple circuit you have NO BUSINESS screwing around with it.
OP: Take the bike, or just the brakes, to someone that knows what they're doing. If you remove the setup and bring it to me, I'll bleed it for you
Click to expand...

hard to see what's going on over the internet, can only work with what you got.
 
but it is pretty awesome if you can actually help some biker fix their ride from miles away.

Brakes are Easy to fix if they don't work, replace parts.
Hydraulics are as easy to fix as plumbing, replace parts.
Job done, bleed and test ride ?️
 
bitzz said:
HMMmmmmmmmmmmmmm
Two weeks and you guys still haven't figured it out. I don't think I would hire any of you to fix my brakes.
Hydraulic disc brakes is a pretty simple circuit, nothing complicated about it.

NO I AM NOT OFFERING ANY SUGGESTIONS
If you don't understand this simple circuit you have NO BUSINESS screwing around with it.
OP: Take the bike, or just the brakes, to someone that knows what they're doing. If you remove the setup and bring it to me, I'll bleed it for you.
Click to expand...
you couldn't afford me, so no worries
 
GreyGhost said:
Not obviously. I think it may have been wicking through the braid. In that case it was a hydraulic clutch but fundamentally similar. Days of head scratching and trying various options and finally resorted to part swapping to find the issue. Luckily the first part swapped was the winner.
Click to expand...
It could also be a herniated line. Rare, but that’s likely what you had. A tear in the pressure layer puts the lining pop thru and expand like a balloon, no leaks but also no pressure. Very hard to see if there is an external braid.

Try returning the old lines to the bike. If they bleed ok, then you have eliminated calipers and master. Swap the braids one at a time bleeding in between to prove the braided lines.
 
Can you put your finger between the plates and even feel movement?
even just using a syringe and plastic tube just pushed onto the bleed screw? .... careful that can get messy.
 
You must log in or register to reply here.

Back
Top Bottom