The New 2006 Linked Brakes

[Warchild]

I haven't seen this close-up of the new Nissin Linked Brake caliper before now:

But the LBS description off the Yamaha site confuses me a little:

Standard equipment Unified Braking System w/ABS: The front brake lever activates six of the eight front braking pistons and two rear pistons; the rear brake pedal activates two rear pistons and the other two front pistons—for balanced anti-lock braking in all conditions.

In this above image only see four pistons per front caliper... I'm guessing that means that one full pair of opposing pistons (the lower set in the above image), and just the outside half of the remaining opposing pistons (per front caliper) activate...?

Hmmmmmmm...... <_<

 

[SkooterG]

Hmmmmmmmm......

That does seem odd.

Well, I guess we are all going to have a lot to talk about for a while......

 

[Randy]

From the Yamaha Canada site

All new unified braking system with computer controlled ABS. When the front brake is applied, all 4 - LHS front caliper pistons are activated, while only the "upper" two pistons on the RHS front caliper are activated. When applying the rear brake, both rear caliper pistons are activated plus the two lower pistons on the front RHS caliper are activated. Brake feeling is the same as previous versions.

 

[radman]

Thats what I thought I had read-they only use the RH on pedal application. Speigler lines for this thing should come to about $11,000.

 

[Ignacio]

Did you see the FJR Comparison PowerPoint?

Mid caliper is a line that's identified as coming "from the metering valve". Can it be that the upper hose reaches 2 of the 4 pistons on the right side and all 4 on on the left?

And since there are two calipers diagramed and only one has the hose (the right one)--we can get that 2 or 8 piston squeeze scenario if:

Applying the rear brake means the mid line is pressurized and the right rotor is squeezed by 2 opposing lower pistons.

Applying the front brakes means both lines are pressurized presumably equally on both calipers by all 8 pistons (but on two different circuits).

Or maybe fairies have stopped FJRs all this time?

 

[jestal]

del

 

[Constant Mesh]

For the caliper image shown in Warchild's message you can see two brake hoses. The top hose (nearest the fork) is actuated by the hand brake. This hose pressurizes the two upper pistons (nearest the fork) on opposite sides of the disc. You can see a bleed screw for this two piston system.

The lower hose is fed from the rear brake system. When the pedal is pressed this hose pressurizes the lower two pistons on opposite sides of the disc. You can see another bleed screw for this two piston system. A remote flow-control metering valve controls/attenuates the pressure applied to the lower pistons.

The four pistons of the front left caliper are totally controlled by the hand brake.

It would appear the rear brake caliper has been changed. The rear caliper now in use would appear to have only one piston. Yet, the '06 info states that the rear caliper is now a two piston unit -- opposing pistons on opposite sides of the disc.

 

[moby one]

All of that fancy stuff and they still opt for the gay ass schwinn fork reflector.