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04-03-15, 10:48 PM | #1 |
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brake pistons
why are brake pistons cupped?
why not have them solid with a thread tapped in the middle so you can pull them out with a bolt. |
04-03-15, 11:51 PM | #2 |
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Re: brake pistons
Weight I guess!.
A nut welded in the bottom could work. |
05-03-15, 07:26 AM | #3 |
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Re: brake pistons
I would say weight. Daft as it sounds that's a good idea
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05-03-15, 08:34 AM | #4 |
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Re: brake pistons
I'd also have said weight,
why not machine a thread on the inside of the cup or a bit you could thread a bolt into like Bib say to make extraction easier.
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05-03-15, 11:47 AM | #5 |
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Re: brake pistons
I'm going to go with weight and cost
A lump of steel that size would weigh a fair bit, cost a lot more and store heat from the braking action more readily. Jambo
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05-03-15, 11:59 AM | #6 |
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Re: brake pistons
Definitely weight, and I go with the heat issue too. But not cost. I'd cost the same to but a thread in as it would to bore it all out in the first place.
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05-03-15, 12:20 PM | #7 |
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Re: brake pistons
Aren't they cast? Therefore huge material savings.
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05-03-15, 12:26 PM | #8 |
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Re: brake pistons
To answer my own question, apparently not, according to youtube.
However there's so much machining going on that I don't think boring them out would add much to the cost. https://www.youtube.com/watch?v=jrazNLUIQIM
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05-03-15, 01:46 PM | #9 |
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Re: brake pistons
The pistons on a Kwak we bought years ago were hollow, as normal, but there was also some sort of insert in there.
I never got around to working on that one so never got to investigate, any Kwak owners know what I mean?
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05-03-15, 02:41 PM | #10 | |
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Re: brake pistons
Quote:
Looked a bit like this Jambo
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