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New Disc Brake, Bit Overkill?


PaRtZ

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Can anyone remember the proper maths behind hydraulics?

Surely if there's more pistons then the pressure applied to the lever is spread out amongst them meaning less pressure per pad?

More/larger pads equals more friction but less pressure as its more spread out so overall less force?

Or have i got the wrong end of the stick? :)

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Can anyone remember the proper maths behind hydraulics?

Surely if there's more pistons then the pressure applied to the lever is spread out amongst them meaning less pressure per pad?

More/larger pads equals more friction but less pressure as its more spread out so overall less force?

Or have i got the wrong end of the stick? :)

I am pretty sure your right :lol:

Always been an area of concern for me - questioned it many times!

Edited by philking
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Can anyone remember the proper maths behind hydraulics?

Surely if there's more pistons then the pressure applied to the lever is spread out amongst them meaning less pressure per pad?

More/larger pads equals more friction but less pressure as its more spread out so overall less force?

Or have i got the wrong end of the stick? :)

You are indeed holding the incorrect end of the stick. I can't remember how/can't be bothered to explain it properly but more pots should equal more power, and also more modulation as mentioned in the description thingy.

One thing that does worry me is there's no mention of weight.... I wouldn't mind a set to check out on my Coiler though hehe

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The advantages of more pistons are something along the lines of:

Slimmer (and therefore stiffer) caliper while still retaining the same overall slave piston area.

Lots of surface area to get rid of heat.

Can be used to give better modulation (different sized pistons to let the brakes feed in).

Probably more but I can't be bothered to think right now :P

But, they're heavy and expensive.

As for the pressure per pad thing - discs dont really rely on pressure. Two very flat surfaces will try and stick themselves together (Seisimir Effect? I can't remember exactly), so if you have two very large flat surfaces (big pad and large rotor contact), it'll work well. If you want more pressure too, you can just put bigger holes in the rotor.

The brake looks alright, would rather something less generic-looking on my bike though!

Adam (on Dave's PC cos mine is dead :()

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Nice piece of kit there, but i would say it more for the likes of downhill/freeride? There's jus too much more than needed there for it to suit trials, however the 4pot does look very tempting and at a pretty decent price too! Maybe ill get one :-

Rob

EDIT: My point exactly :P

Edited by Robwalker
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Can anyone remember the proper maths behind hydraulics?

Surely if there's more pistons then the pressure applied to the lever is spread out amongst them meaning less pressure per pad?

More/larger pads equals more friction but less pressure as its more spread out so overall less force?

Or have i got the wrong end of the stick? :)

wasnt that about the coust pads? or am i wrong? wasnt the 35mm and the 50mm, the same braking power? or am i getting uberly spun out?

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