Squeeling disc brakes.....
Discussion
Just carried out a brake service on my bike, it has a 4 year old Deore hydraulic system. The discs were fine, so I replaced all brake pads, and bled the front and rear brakes and put some brand new mineral oil in. I've got a really nice firm but progressive feel back in the levers, but they are squeeling, and I mean LOUDLY!!!!!
I don't think 'bedding in' with some hard stops will solve this. Any ideas? I'm tempted to just cover the whole set-up in WD40, then hope once the power is restored that the squeeling will go. Cheers for any advice guys....
I don't think 'bedding in' with some hard stops will solve this. Any ideas? I'm tempted to just cover the whole set-up in WD40, then hope once the power is restored that the squeeling will go. Cheers for any advice guys....
DON'T DO THAT!!!!
Yeah, on second thought NOT a good idea! I think that when I was bleeding the brakes some of the fluid must have gone onto the discs and pads, which may be causing or contributing to the squeeling. I'm tempted to just give it a good caning and see if it goes away, I'll have to find somewhere away from any residential area though, it's that bad!! I don't want to sand the pads, they are brand new after all.
Hollywood Wheels said:
Yeah, on second thought NOT a good idea! I think that when I was bleeding the brakes some of the fluid must have gone onto the discs and pads, which may be causing or contributing to the squeeling. I'm tempted to just give it a good caning and see if it goes away, I'll have to find somewhere away from any residential area though, it's that bad!! I don't want to sand the pads, they are brand new after all.
If you did get brake fluid on the rotors and pads then clean the rotors with alcohol and go buy some new pads, as your pads are ruined.
Yup - fluid on the pads.
Are your brake mounts properly faced?
As for the pads - not much you can do I'm afraid. It may go away in time, but probably not.
Never leave the pads in while your bleeding. You should have a little yellow plastic block that goes in the caliper that spaces the pistons out and negates the risk of contaminating the pads and disc.
Are your brake mounts properly faced?
As for the pads - not much you can do I'm afraid. It may go away in time, but probably not.
Never leave the pads in while your bleeding. You should have a little yellow plastic block that goes in the caliper that spaces the pistons out and negates the risk of contaminating the pads and disc.
Right.........my plan of action is..........
Gonna remove the pads and run them once over some abrasive paper, just to remove any surface contaminant. No way am I ditching a set of new pads! Then I'll clean the discs with some white spirit or similar. Will update with results (if any!) in a couple of days....
HW
Gonna remove the pads and run them once over some abrasive paper, just to remove any surface contaminant. No way am I ditching a set of new pads! Then I'll clean the discs with some white spirit or similar. Will update with results (if any!) in a couple of days....
HW
Maybe my memory is fading, but I'm sure the last set of pads I had were only a fiver or so? Annoying, but hardly a cause for suicide if you do have to bin them.
Also worth checking if you've put on a hard compound by mistake? I get this with the car. I put racing pads on prior to taking it on track at Brands, and haven't got round to swapping them back out yet, and the squeal like the proverbial stuck pig unless they're really up to temperature!
Also worth checking if you've put on a hard compound by mistake? I get this with the car. I put racing pads on prior to taking it on track at Brands, and haven't got round to swapping them back out yet, and the squeal like the proverbial stuck pig unless they're really up to temperature!
The problem with the pads is that they are sintered metal, allowing the brake fluid to seep into the pad. Consequently its more than just a little surface contamination.
Most solvents will still leave behind a thin residue film that may be just as bad for the disks as the original contamination.
I would use nothing other than proper brake cleaner spray on my disks and buy new pads. Its not the cheapest way but you will thank yourself later when its all working like it should
Most solvents will still leave behind a thin residue film that may be just as bad for the disks as the original contamination.
I would use nothing other than proper brake cleaner spray on my disks and buy new pads. Its not the cheapest way but you will thank yourself later when its all working like it should
Sqealing is normally caused by something vibrating, so check the security of all parts. A slight toe in of the pads can reduce squeal.
I personally do not mind my brakes squealing.
Contaminated pads...........
They will never give the performance of uncontaminated pads what ever you do to them. In my mind its not worth the risk to use sub standard parts. However I tend to ride on the limit and need absolute trust in my bike. If you potter around and do not use the full capacity of your brakes then they will be fine.
I personally do not mind my brakes squealing.
Contaminated pads...........
They will never give the performance of uncontaminated pads what ever you do to them. In my mind its not worth the risk to use sub standard parts. However I tend to ride on the limit and need absolute trust in my bike. If you potter around and do not use the full capacity of your brakes then they will be fine.
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