ST4S : radial brakes

[kope999R]

I did my fist 200 mile stint on the ST4s ABS i got last week.

coming from a kitted 999R i had to adjust but love the bike.

the only thing leaving me wanting is the brakes. being used to some upgrade Brembo Perfomance calipers and master cylinder, the standard brakes a a bit of a let down...

can anyone give me the size of the showa forks that fit the yokes?
has anyone any experience with upgradeing the brakes?

tx

Koen

[moto]

can anyone give me the size of the showa forks that fit the yokes?
has anyone any experience with upgradeing the brakes?

The BREMBO 7850 Series "4 Pad" Cast Caliper: 65mm Axial are a direct bolt on to the forks. You may need a side mount brake line.

The ST4S uses 50mm forks with a 65mm mount.

I'm adding the BREMBO "RCS" Forged Radial Brake Master Cylinder as well as the calipers this winter to my ST4S.

I upgraded the rotor with CORSE DYNAMICS Full Floating Rotor Button Kit: 20 and cleaned them thorughly with a Rotor Hone Tool to remove any old brake pad material.

-M

[Gearbox]

"The BREMBO 7850 Series "4 Pad" Cast Caliper: 65mm Axial are a direct bolt on to the forks. You may need a side mount brake line."

These look the same as the standard (Teflon coated 4 pot pistons) fitment so what is the difference/improvement ?
(Just asking)

[Puffin64]

Originally Posted by kope999R

can anyone give me the size of the showa forks that fit the yokes?
has anyone any experience with upgradeing the brakes?

I have a set off 916/996 showa forks Ti coated to fit on my ST2, but found they are a different size, so I have purchased the bottom yoke off the 916/996 and plan to use the top yoke off the ST2. It had to be bored out as the tops of the 916/996 forks are 53mm, but it can handle 1.5mm off each side as the others are 51mm.
Mine are supposed to have Ohlin internals according to the guy off ebay I got them from, I will found out when I get the fork seals changed if he's been telling porkies or not.
I've also converted mine to the P4 calipers found on the 999, and find the braking great when I use them; but with a V twin that isn't very often with all that engine braking.
I'm also using the 916/996 master cylinders in place of the coffin style ones I had before.

[guido]

Hello, Gearbox

The four seperate small pads allow for better pad contact than two large pads.
Almost always, when you pull your pads after mega miles, you see where the leading or trailing edge (usually leading) is worn substantially more than the remainder of the pad.
Using more and smaller pads helps to eliminate that and promote even pad load distribution.
Or that's what little I know about it anyway....

[guido]

Hello

I have a stock braking system on my '03 sT4S except for **9 radial masters, aftermarket hoses from master to ABS unit, and TPO floating buttons in the rotors. It stops pretty adequately, two-fingered stoppies all day long (don't let anybody tell you ABS defeats stoppies)
My '02 St4S (non-ABS) has 1098 radial masters, dual hoses to four-pad **9 calipers w/HH pads, and BrakeTech Axis iron rotors.
Those friggen' brakes scare me.
I can't tell you how many times I've inadvertantly "chirped" the front tire (Michelin Pilot Pure's) with one finger on the lever.
I can't imagine why anybody on God's green earth would need or want more powerful brakes than those.
I'm scouting for some pads compatible with the iron rotors that maybe provide a bit less initial bite than the EBC's I currently have, but other than that, if you're looking for brakes for your ST4S, this setup will do the trick.
Not really ABS compatible, though. I'd go with radial master (1*98) and four pad calipers shouldn't mess up the ABS stuff. You may need new lines from the masters to the calipers, though. Different angles on the banjos.

JMHO....

[moto]

Originally Posted by guido

two-My '02 St4S (non-ABS) has 1098 radial masters, dual hoses to four-pad **9 calipers w/HH pads, and BrakeTech Axis iron rotors.
Those friggen' brakes scare me.
I can't tell you how many times I've inadvertantly "chirped" the front tire (Michelin Pilot Pure's) with one finger on the lever.
I can't imagine why anybody on God's green earth would need or want more powerful brakes than those.
I'm scouting for some pads compatible with the iron rotors that maybe provide a bit less initial bite than the EBC's I currently have, but other than that, if you're looking for brakes for your ST4S, this setup will do the trick.

....

Try the
FERODO 'ST' Sintered Brake Pads:4 pad

These were designed to be used with ductile iron rotors such as the and have less initial bite than the EBC HH.
I 've used these pads on several bikes that have the Brembo 4 pad calipers. They are much less abrupt and have better control than the EBC.

-M

[kope999R]

wonter is approaching fast and it ill be interesting to ponder all the options.

ain't it fun!

regards

Koen

[MarkST]

Originally Posted by kope999R

wonter is approaching fast

I hate wonter, it is very tedious.
The wonters over here in the UK are horribly gray and seem to last forever.

[SS904]

Depends on what you feel needs improvement. I can't compare braking power to your 999, but here's the progression of upgrades I've done. They have mostly been to counter the brake judder that appears to be inherent with the OEM pads and Brembo "snowflakes" that come on the S models (often misdiagnosed as a warped rotor).

Full floating rotor buttons with OEM pads and OEM rotors. Judder completely gone, very low to none at all brake drag. Had that set up for a long while. Worked well for me, but eventually became tired of the sloppiness and rattle.

Most recent change was to Ferodo Platinum pads and a set of significantly lighter OEM rotors off a base 998. Perfect so far. No judder at all. Minimal brake drag, as the organic Ferodos have a fairly low initial bite. Improved feel with more (progressive) power than the OEM set up. I have also tried EBC HH sintered pads with the OEM rotors. Just too much initial bite for me. If you’re looking for outright stopping power, I’d say give those a try.

Never really felt the OEM set up lacking in power, but I only ride on the street and I'm one who uses 4 fingers to stop when I need to stop, two to control speed, and stoppies scare the sh*t out of me, so I don’t even try...