xbrito
2nd Class Ticket
Posts: 4 
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Post by xbrito on Apr 17, 2014 20:26:17 GMT
Having overhauled my PX200E over the winter as it was looking worse for ware, I got my newly powder coated brake calliper back from the paint shop, but they had removed the pistons prior to painting. I have purchased a new set of rubber seals, and from what i can see i need to fit the rubber seal inside the piston area first and the try to push the piston in. And that's where I remain. Is there a knack of getting the piston passed the rubber seal or is it just a matter of shear force?
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Post by rab on Apr 17, 2014 21:12:57 GMT
use washing up liquid to grease the dust seal so it slides in DONT use any type of oil it will contaminate your pads
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Post by sbwnik on Apr 17, 2014 21:59:37 GMT
^^that
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Post by kru251 on Apr 17, 2014 22:02:45 GMT
Use some clean brake fluid to lubricate the 'O' rings. Make sure the piston is entering the brake block squarely (not slightly c**ked)
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xbrito
2nd Class Ticket
Posts: 4
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Post by xbrito on Apr 20, 2014 13:28:49 GMT
Thanks People
The washing-up liquid did the trick. However, and there is always a however, now that I have rebuild and fitted the calliper, when I started to bleed the brake, I noticed that the bleed nipple is screwed all the way in and fluid is still coming out as if open. Investigation appears to indicate that there should be a ball bearing below the nipple, which must have become displaced when cleaning as part of the prep for powder coating.
What I need to know is, is there only a ball bearing, or could there be another part that may have been lost. As this calliper came with the scooter when new, its a standard calliper.
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Post by rab on Apr 20, 2014 14:23:48 GMT
it costs pennys to buy a new bleed nipple dont try fix it ( you cant ) just get another
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xbrito
2nd Class Ticket
Posts: 4
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Post by xbrito on Apr 20, 2014 18:24:36 GMT
there's nothing wrong with the bleed nipple, in fact I tried a second nipple which had the same effect. I think there is supposed to be a ball bearing which sits under the bleed nipple, but is not part of the bleed nipple. I just want to make sure its just a ball bearing or is there some other seating that may have come out.
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Post by sbwnik on Apr 20, 2014 18:37:16 GMT
Yes, there should be a ball bearing, it's what seals it shut. But they're a part of the nipple.
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Post by henri on Apr 21, 2014 9:59:11 GMT
yep,piaggio use's the same caliper on different models,so the union hole an bleed nipple hole are machined the same .the same caliper can then be used on another model upside down with bearing in union hole an banjo connected to bleed hole. the bearing is same size as the 1's in a cage at top of forks ,so if youve got a old bearing around pinch 1 of the balls .if it still weeps have a look in bore an make sure the seat at bottom is clean ,as a last check if it still weeps put bearing in hole an hit it once with a flat punch an hammer to "seat it".just a sharp tap should do it .its how you "seat" the pressure relief ball valves in old cars/bikes,but try a new ball/nipple first an probably ya caliper will be fine.
i wouldnt of used washing up liquid myself ,but lubricated bore/seal with clean brake fluid,an outer dust seal's with red rubber grease .washing up liquid has salt in it to soften the water an give ya bubbles,H
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