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April 28th, 2007, 08:17 PM   #1
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Brake Caliper Problem...Help Needed.

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Firstly I have not been riding with my foot on the brake.
I replaced pads in rear calliper 3 rides ago and noticed I couldn’t get the old ones out unless I cracked the bleeder and pushed on the pads. It was very hard to push it all the way back to normal position which was needed so i could insert the new pads. It seems to me as though it just wants to keep pushing the pads in and wearing them. The last 2 rides have been muddy. However i still have to crack bleeder to get the pads to move in so i can put new ones in again. I have never had the pads wear this quickly before ever on this bike or my old berg 400 and when changing pads on berg 400 I didn’t need to crack bleeder or apply super human strength to push them in. Some help to fix my break problems would be greatly appreciated.
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April 28th, 2007, 09:44 PM   #2
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RE: Brake Caliper Problem...Help Needed.

Anyone?
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April 28th, 2007, 09:53 PM   #3
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facktor,

Maybe there is a bit of grit jamming the seal slightly and not allowing the piston to fully retract. The angle and flex of the seal is what retracts the piston and if something is inhibiting that then that may be it. Only way to tell and then only maybe, is to dismantle the caliper and have a good look at the seal. Maybe have a new one on stanby anyway and just replace it. Other possibility is free play at the pedal, is pressure coming off? Is return spring fully returning the pedal?

Hope this helps
Steve
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April 28th, 2007, 09:54 PM   #4
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Yes the pedal is returning back to its neutral position...

So I would have to remove the caliber etc and dismantle it?
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April 28th, 2007, 09:56 PM   #5
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Any ideas on what the seals are worth, and are they easy to install anyone fixed these before?
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April 28th, 2007, 10:11 PM   #6
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They're probably not hard to pull apart. I haven't done the brembos on the Berg yet, but I imagine that they are simple enough. just remove the disc and pump the pedal and the piston should pop. If you run low on fluid, top it up, or just pull the piston. There'll be a seal or two in there. Be careful, and be clean and lube with brake fluid when reassembling. You can get special assembly lubes for brakes too but not really necessary in my limited experience with rebuilding brakes.

Good luck
Steve
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April 28th, 2007, 11:04 PM   #7
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so u just pump the break until the piston comes out and them look at those seals behind the piston.
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April 29th, 2007, 12:55 AM   #8
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Its how I've done it on other disc brake systems.
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April 29th, 2007, 01:56 AM   #9
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faktor ...

get a rear caliper kit to suit , fresh brake fluid , a clean area to work in .

take note of whats in the caliper kit , and remove the same parts in the caliper .

i think you have become a victim of dirt , crap , and moisture , inside the brake system .

beware of trapped air when you attempt to bleed the system back to life !!!
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April 29th, 2007, 03:53 AM   #10
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faktor,
You should not have to crack the bleeder to displace fluid when you push the caliper piston back in.

This should automatically push back into the master cylinder reservoir when the caliper piston is depressed.Unless the m/cyl is too full and wont allow it

Not sure about the Brembo rears, but I have seen an adjustable lever fitted to a front brake once that was adjusted too much, allowing the m/cyl piston to go past a port in the m/cyl, effectively blocking the return of fluid..

This meant that all fluid was trapped between the m/cyl piston and caliper piston, and when the fluid heated up it had no room to expand other than push the caliper piston out and make the brakes drag, instead of returning back into the m/cyl when the lever was released...............

Also make sure you grease the 2 sliding pins under the dust covers when you have the caliper apart- have seen these seize up/get sticky due to corrosion too.

Just something else to keep in mind if the other fixes above dont get you out of trouble..
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