Hydraulic Brakes ~ Are any new systems NOT 2 piston type?

Hydraulic Brakes, are any NEW systems (2011) NOT 2 Hydraulic pistons, per EACH caliper?

Or are they all? That is do all the hydraulic brakes have at least 2 Hydraulic pistons per EACH caliper? From as many manufacturers as you can think, such as: Hope, Avid, Tektro, Clarke, Shimano, Magura, etc

Also have you seen the MBUK hydraulic brake test at Fibrax? A MTB rolling road, DRY & WET!
http://www.bikeradar.com/gear/article/h ... kes-24345/

Also they made a Video clip of a rolling road hydraulic disc brake test, see below:
WMV VID 20 mb's

Also of interest an article on the Caliper standard mounts (IS and Post Mount):
http://en.wikipedia.org/wiki/Bicycle_br ... _standards

So back to my question again, when I press the brake lever of hydraulic disc brakes, do both brake pads push inwards to contact the brake disc/rotor?
IE. When I look down did both pads go intogether?


Because on cable pull mechanical disc brakes ONLY ONE pad is pushed forward by the caliper (That pad pushes against the disc, then the disc is pushed ever so slightly to fixed but adjustable pad).


See the analogies being made here? If NOT, as TANK said in the film The Matrix (Yes, that old chestnut), or words to such effect, then you're a pile of worthless rubbish!

Yes, modern calipers have 2 pistons, 1 each side that push each pad towards the rotor.

hayes sole have a fixed pad

Many have 4 or some had 6.

Never has the phrase 'of interest' been so misused, there really couldn't be a more boring wiki page. On second thoughts there is one that is far worse:
http://en.wikipedia.org/wiki/The_Matrix

Shimano XT used to have 4 pistons.

hope did/do them in 4 and 6 piston varieties.

as an aside, Hope now sell ventilated disc rotor.

BTW what is with the pointless non bike related pctures in your posts?

The Photos? Just amusing similarities, analogies & double entendres.

Ashima make a pistonless brake ....

http://www.bikeradar.com/news/article/f ... rake-24704

I imagine some disk brakes may be a little awkward to BLEED.

Also I guess some HOSES are hard to cut, and if you buy any BRAIDED HOSES, they better be the right length, don't think you could cut those to size EASILY!


Also I guess some of the HOSES UNION (OLIVES), may be useless, whereas others will be easy to fit and perform trouble free.


But I guess with the following tools, for the CALIPER and the BRAKE LEVER RESERVIOR, it should be initially straight forward to get started!:

Such as: BLEED VALVE SPANNER, PIPE for CALIPER BLEED VALVE, JAR to collect old BRAKE FLUID, SPANNERS (8MM, 10MM, etc), WIRE/PLIER/HOSE CUTTERS, NEW BRAKE FLUID, ALLEN KEYS, SCREW DRIVERS, KITCHEN PAPER/CLOTH (To prevent spillage over disk/pads/rim/bars/stem/floor, etc).

Still guess putting the BRAKE LEVER RESERVIOR housing cover back on, and pulling the brake lever, pressing master cylinder within, it would be immediately obviously if there was any AIR (Spongy feeling) in the system, or if you had adequately tightened the bleed valve bolt! (If not tight, there would be a leak!)