Don't Ashima already do a twin piston with a 14mm inner and 22 mm outer piston
Brakeforce One bestest ever brakes - geekery
That's twin piston at the caliper though
The first is called the APV, and it uses a concentric twin-piston design for two-stage braking. When the lever is activated the inner, 14mm piston contacts the rotor first, and as more pressure is applied the outer, 22mm piston ring kicks in.
I thought that ABS was standard on bikes from Halfords or is that they set their brakes up not to stop you.
Telescopic pistion is prob the best way to describe the brake. Hope it works out for him and don't get shafted by the big players.
"DrP - Member
THe first post is my thoughts - a 'telescopic' piston.
First piston provides the majority of movement to get the pad to the disc, second piston provides the force.
In reality, it would be the smaller of the pistons that would push the pad out quickest (i.e. i expect the inner piston moves first), then the larger piston would come into play (larger piston surface area would provide less movement, but more force)
ARACER "Interesting, but it's not encouraging that he's got it backwards - a small piston moves fast, a big piston exerts lots of pressure"
Clubber "OK, to clear up. A large piston at the lever will move the pads quicker than a small one but with less power. So the system uses the large piston first then transfers to the smaller one."
sorry to say but your are all wrong! Clubber is the most right as I belive that how the brake is desgined,
But you/I can't be 100% with out knowing the size of the caliper piston(s) to size of the master ones,size of cambers,hose etc.
You can have a big piston 30mm dia but if the one on the other end is bigger at 60mm it not going to move it as far as a smaller 15mm piston.
Clubber "So it looks like the large outer bit moves first and then the much smaller inner piston moves once the pad contacts the rotor though I'm not sure how the system transfers from one piston to the other as left free, the small piston would move first (less resistance)"
If i remember rightly it to do with pistion "contact face" area and camber volume.
Looking at the pic of cross section that Clubber posted,I would say that the "bigger pistion" has a slightly biger area than the small one with the small pistion in it's own little chamber. the fluid/pressure as to travel down the resticted hole (less fluid/more press) into a bigger chamber (more fluid/less press)so should not move ahead of the bigger piston but with it till the big piston hits it stops/travel limit and at that point all fluid/pressure is on the small piston for that to keep moving.
It's all in the Maths!
377 euro an end
I have just bought myself a set of Brake Force One brakes and after the first rides I have to say I'm really impressed. I got mine from this shop: http://www.starbike.com/p/Brake-Force-One-disc-brake-4727-en
Until now I had Hope 4-piston brakes on my Santa Cruz (which are anything but weak) but the Brake Force One beat them hands down. I was able to brake smoothly with one finger even in steep downhill sections. The only bad aspect is probably their price tag - 390 € per front or rear brake - but my Hope brakes weren't exactly cheap either...
u registered just to spam this?
£330 odd per end. No chance. at all. ever.
Trailgeek - pics and maybe something to show you're not just spamming...
Guess not.. More astroturfing I reckonPosted 2 years ago #
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