Issue with rear hydraulic brake.
Posted: 10 Sep 2019, 7:54pm
Hello all,
My uncle advised me to come ask this here.
Bought a mountain bike the other day, not got a lot of experience but have been tinkering.
My main issue is the back brake.
It's a Shimano deore br-m595 https://i.imgur.com/ssHMepY.png
From what iv read it's a great brake. There was no resistance to the brake lever. I checked the pads and they seemed fine.
So I bought a kit, topped up the oil and bled my brakes. It wasnt straight forward and the one video I could find of this brake system getting done, that way did not work.
I have the little funnel that screws in. But that does not fit. It's a reservoir (see pic - https://i.imgur.com/YHfrMRI.png)
It was entirely dry. So I topped it up with liquid. And then went about bleeding. So I attached a tube to the bleed nipple and just into a bag to contain the liquid.
I pumped the brake 3 times. Held it on. And then quickly opened and closed the bleed valve. This got most of the old fluid out. But the reservoir was not going down like the guy in the video said it should. It just remained full until I could get no more old mineral oil out the system.
So. I problem solved. I attached a syringe to the bleed nipple ensuring no air was in the tube or the syringe. I also made sure the reservoir was open, but full. I then opened the bleed valve and pushed oil up through the system until the reservoir overflowed a little bit. I did this a few times until no bubbles came out.
I sealed the system and the brake was firm. Not as firm as I would like. But 1000% better than it had been.
However the back brake is still not great. It slows you down. But it just does not have the bite of my front brake.
It also sings. Makes that horrible squealing noise.
So I took the wheel off and cleaned the disk, both sides with isopropyl alcohol and ensured it was nice, shiny, clean and bone dry.
The issue still persists.
So I took the brake pads out and took them to the sander and just roughed them up a little bit.
Still the issue persists.
I have ordered new pads which will arrive in a couple days.
But does anyone else have any experience or expertise they could shine on this.
I'm completely out of ideas and any help would be greatly appreciated.
Thanks in advance.
My uncle advised me to come ask this here.
Bought a mountain bike the other day, not got a lot of experience but have been tinkering.
My main issue is the back brake.
It's a Shimano deore br-m595 https://i.imgur.com/ssHMepY.png
From what iv read it's a great brake. There was no resistance to the brake lever. I checked the pads and they seemed fine.
So I bought a kit, topped up the oil and bled my brakes. It wasnt straight forward and the one video I could find of this brake system getting done, that way did not work.
I have the little funnel that screws in. But that does not fit. It's a reservoir (see pic - https://i.imgur.com/YHfrMRI.png)
It was entirely dry. So I topped it up with liquid. And then went about bleeding. So I attached a tube to the bleed nipple and just into a bag to contain the liquid.
I pumped the brake 3 times. Held it on. And then quickly opened and closed the bleed valve. This got most of the old fluid out. But the reservoir was not going down like the guy in the video said it should. It just remained full until I could get no more old mineral oil out the system.
So. I problem solved. I attached a syringe to the bleed nipple ensuring no air was in the tube or the syringe. I also made sure the reservoir was open, but full. I then opened the bleed valve and pushed oil up through the system until the reservoir overflowed a little bit. I did this a few times until no bubbles came out.
I sealed the system and the brake was firm. Not as firm as I would like. But 1000% better than it had been.
However the back brake is still not great. It slows you down. But it just does not have the bite of my front brake.
It also sings. Makes that horrible squealing noise.
So I took the wheel off and cleaned the disk, both sides with isopropyl alcohol and ensured it was nice, shiny, clean and bone dry.
The issue still persists.
So I took the brake pads out and took them to the sander and just roughed them up a little bit.
Still the issue persists.
I have ordered new pads which will arrive in a couple days.
But does anyone else have any experience or expertise they could shine on this.
I'm completely out of ideas and any help would be greatly appreciated.
Thanks in advance.