Triumphrat

minesweeper · 03-05-2010, 01:24 PM

I have a 2002 centennial 955i and was hoping to replace the rear brake system (apart from the brake itself)
What are the options available? any direct bolt replacements?
thanks for any help.
matthew

DEcosse · 03-05-2010, 02:10 PM

Kawasaki ZX7 91-96 is direct bolt-on replacement but 1/2" vs 14mm Triumph.
Gives better braking force at the caliper - very noticeable improvement

Or you can install complete Sprint ST Rotor/Caliper/Hanger combo which will give the advantage of the bigger rotor size.

Wally · 03-06-2010, 10:59 AM

DE, that one confuses me. I've been considering the same upgrade, but a smaller piston physically cannot exert more force for a given pressure. The exact opposite is true.

Perhaps the OEM is 1/2" (12.7mm) and the Kawasaki is 14mm?

DEcosse · 03-06-2010, 02:03 PM

Quote:

Originally Posted by Wally

.. but a smaller piston physically cannot exert more force for a given pressure. The exact opposite is true....

No - I have it correct.
This is the master - The master has applied force & a resultant pressure, not applied pressure & a resultant force (which is what the caliper does)
We're talking about increasing pressure from the master for same applied force from your foot.
That increased pressure translates to greater force at the caliper end (the caliper's piston area being unchanged)

For master:
Pressure is Force per Unit Area.
P = F/A - if A is smaller, P is higher.
For same applied force, smaller piston means greater pressure.

For Caliper:
Force = P*A
If P is now made higher (because of the smaller master piston) F is higher.

Think of the Stiletto heel analogy - woman in spike heels will leave impressions on a lino floor, vs guy twice her weight with flat 3" x 3" heels
The woman is a 'master' not a slave (or caliper)

Wally · 03-06-2010, 09:08 PM

I stand corrected...I was considering it from a hydraulics perspective where P is the constant and A is increased to yield a higher F (as in your "caliper" example).

Ironcobra · 03-26-2010, 11:47 AM

does this apply to an 04?

DEcosse · 03-26-2010, 12:42 PM

Yes, master is same.

Linz · 03-26-2010, 11:11 PM

I have to split my front calipers as I'm sure I have pistons which need a look at. Does anyone know the following:

What torque figures are to be used when rejoining the halves?
What brand of brakes are on an '06 Daytona? Tokico, Nissin, Brembo?

I believe Triumph don't want anyone fiddling with the brakes but I've serviced brakes all my riding career. Is there a problem with splitting, servicing and refitting of which I'm unaware?

DEcosse or BradTX especially, have you ever split Brembo Golds and serviced? Torque figures for rejoining the halves. I can't find it anywhere.

Any help appreciated.

Linz

bradtx · 03-27-2010, 12:15 AM

Linz, I double checked at BikeBandit and the '06's front calipers are the same Nissins as on all of the D955is.

We split the calipers on the '02 quite awhile ago, but never found a torque value for reassembly so IIRC we tightened to 25-30 Nm and so far, so good. They're very straight forward to work on and there is a seal kit for the pistons, and we went to an auto parts store for the caliper halves' seals (O rings). I've never worked on Brembos, sorry there.

Brad

Linz · 03-28-2010, 09:06 AM

Thanks for that Brad. Massive help.

Cheers mate.

Linz