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Jul 28th, 2012, 9:43 am
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#21 (permalink)
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Life is too short to worry !
Join Date: Oct 2006
Location: Peterhead, Aberdeenshire, Scotland
Posts: 2,274
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"So, do I go with the Chinese discs or try and track down a good second hand pair? I dont see why I should pay a vast premium for Brembo discs when they seem to warp so readily on this bike!"
Quality may be suspect on the Chinese but seriously , I doubt your discs are warped , try as Mark suggests , cleaning the bobbins. I put a long bolt through each one and secured with a nut then attached a cordless drill and sprayed with brake cleaner whilst spinning an the muck that came out was amazing...
If you look for SH discs in spec , what guarantee will you have that you dont just inherit the same problem ?
If you decide to replace any way try Galfer they are a bit cheaper once you include the pads (often sold as a discounted package). I have them and although I dont particularly like the 'feel/action' of the pads the disc quality is good.
__________________
"The Grey Assassin" - 2005 ST4s
Goldvalves , Re-sprung rear Ohlins , Tapered headrace bearings , Galfer Front Discs , Open airbox with K&N filter , Iridium NGK's with Magnecor Leads , 15/42T Cogs , Helibars with Oxford heated grips , HID Lights , CRG 'Stubby' Levers , Zero Gravity DB Dark Screen , Twin-Tone Fiamm Horns plus a bunch of 'detailing' modifications.
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Jul 28th, 2012, 9:56 am
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#22 (permalink)
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Senior Member
Join Date: May 2007
Location: Sleepy Leafy South Birmingham, , England
Posts: 2,447
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Quote:
Originally Posted by Gearbox
I put a long bolt through each one and secured with a nut then attached a cordless drill and sprayed with brake cleaner whilst spinning
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Yes that's a better option.
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Jul 28th, 2012, 10:12 am
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#23 (permalink)
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Senior Member
Join Date: Jun 2012
Location: Newcastle, None, Uk
Posts: 413
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EBC are good. You can get them as fully or semi floating. Always buy new pads when you buy new discs.
Sent from my iPad using MO Free
__________________
Ducati ST4s and Monster 1100s
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Jul 28th, 2012, 2:30 pm
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#24 (permalink)
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Junior Member
Join Date: May 2012
Location: Nottingham, Notts, UK
Posts: 29
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Oh, I'm pretty certain its the discs. As said above, I have 'spun' the bobbins to free them off which made no difference. I then cut out the star washers to convert the discs to full floating which made no difference. I then sanded the discs and removed all paint off the hub flanges which made no difference. Well, actually thats not true, the 'pulsing' through the lever at low speeds is now much more obvious. Pistons all clean and free and wheel bearings and headstock bearings are fine. If there is anything else to check then please let me know as I've reached the end of my list 
Keith
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Jul 30th, 2012, 12:11 pm
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#25 (permalink)
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Life is too short to worry !
Join Date: Oct 2006
Location: Peterhead, Aberdeenshire, Scotland
Posts: 2,274
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Keith , seems you have checked all the normal likely culprits , and as Sherlock says "Once you have exluded every alternative possibility , what is left must be the answer"
So warped discs it is then
__________________
"The Grey Assassin" - 2005 ST4s
Goldvalves , Re-sprung rear Ohlins , Tapered headrace bearings , Galfer Front Discs , Open airbox with K&N filter , Iridium NGK's with Magnecor Leads , 15/42T Cogs , Helibars with Oxford heated grips , HID Lights , CRG 'Stubby' Levers , Zero Gravity DB Dark Screen , Twin-Tone Fiamm Horns plus a bunch of 'detailing' modifications.
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Sep 5th, 2012, 9:02 am
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#26 (permalink)
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Junior Member
Join Date: Jul 2010
Location: Limassol, , Cyprus
Posts: 14
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Quote:
Originally Posted by Keith888
Oh, I'm pretty certain its the discs. As said above, I have 'spun' the bobbins to free them off which made no difference. I then cut out the star washers to convert the discs to full floating which made no difference. I then sanded the discs and removed all paint off the hub flanges which made no difference. Well, actually thats not true, the 'pulsing' through the lever at low speeds is now much more obvious. Pistons all clean and free and wheel bearings and headstock bearings are fine. If there is anything else to check then please let me know as I've reached the end of my list
Keith |
Hi Keith,
I've been trying to sort out this problem for the last 2 months and i have done everything you mention above and the only thing left was the rotors.
Didn't wanted to believe it since it is a very expensive part but it needed to be done after all. (Mine weren't brembo)
After i have replaced rotors any vibrate/pulsing disappeared immediately.
Also i thing there there is no way to check discs if warped by spinning the wheel and using your eyes.
__________________
George
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monster 620
ST4s 04 (married)
999S 06 (gone)
monster 620 (gone)
Last edited by ducapista; Sep 5th, 2012 at 9:07 am.
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Sep 5th, 2012, 3:50 pm
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#27 (permalink)
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Member
Join Date: Apr 2008
Location: stirling, stirling, scotland
Posts: 68
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Keith, on the front end vibrations, i'd say recheck the steering head bearings when the bike has been running and the frame is hot !, ride along the road then wedge a finger from your left hand between the top yoke and the frame, then pull the front brake and see if you can feel any vibration/movement.
I found the normal static way to test the head bearings didn't show any play, but riding the bike and doing the above did, it's worth a try.
__________________
ST4s, works completed from 307miles to 25k miles, replaced crank main bearings, replaced big end shells, changed fork seals and bushes, fuel filters, oil filters, swing arm bushes, fan bypass, desmotimes super cooling fan, drilled clutch casing,headlight off switch with LED reminder, lapped the valves, replaced the valve seals, block greased all electrical connections,canbus 8 led side lights, replaced secondary gear bearings, crankshaft oil seal, lightweight clutch hub, new fuel pipes, re-shimmed valves, wavy rear disc, desmotimes engine sprocket casing protector, new wheels bearings at tyre changes, steering head bearings, cut air box, new clutch plates, new battery, pipes, 3 engine sensors, set of coils, 3 sets of front discs, balanced throttle bodies, side stand bolt, samco hoses, replaced all rear suspension stuff,diablo corsa tyres, 40 tooth rear sprocket, 999 4 pad caliper, re-shimmed gear selector drum and a whole load of other stuff. very old bathroom scales Wet F=122.5KG R=111.0KG Total=233.5KG, headlight relay.
ST4S the greatest multirole road bike ever.
RD250LC - YPVS 350 engine @ 380
VFR750 FV
CBR954RR3
ST4s - MY04 Facelift - Canbus
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Sep 5th, 2012, 4:12 pm
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#28 (permalink)
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Mr Leakered
Join Date: Jul 2008
Location: Lynnwood, WA, USA
Posts: 6,049
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Hey,
That's a new tip in the never-ending pulse/shudder saga. Nice one.
Have a good one.
__________________
tony b
2001 ST4 (Huile and Vinegar)
2013 Ural GearUp (Taildragger)
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Sep 5th, 2012, 5:05 pm
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#29 (permalink)
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Senior Member
Join Date: Jun 2012
Location: Newcastle, None, Uk
Posts: 413
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LOL it sounds more like one of those old fashioned motorcycle tips featuring tights, a detergent bottle and a boot lace. My tip for the STs carbide lamp is to use one of the wife's hair pins and some snuff.
Sent from my iPad using MO Free
__________________
Ducati ST4s and Monster 1100s
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Sep 5th, 2012, 5:27 pm
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#30 (permalink)
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Mr Leakered
Join Date: Jul 2008
Location: Lynnwood, WA, USA
Posts: 6,049
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Hey, hey, HEY! =P
That light, I mean candle, has gotten me through 4yrs of rainy commutes and short northern latitude days in the winter. It isn't great and I'm biding my time for an upgrade, but. . . 
Have a good one.
__________________
tony b
2001 ST4 (Huile and Vinegar)
2013 Ural GearUp (Taildragger)
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