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[trevorch]

Hi All, been off the site for a couple months taking flying lessons. Last August I had the front disc replaced under warranty, due to excess runout. Done about 600km since then and recently noticed under medium braking, I get a slight judder, not audible, but you can see the front pulsing. even with the old disc I was not aware of this. Had new pads fitted of course with the new disc. So, is this common on a front disc brake? What cures my be suggested?

Best regards TrevorCH

[grunda 12]

hi trevorch ,sounds like your disc is warped !!get another on warranty atb paul.

[Stringers Best Mate]

Trev, I'd bet on it being your disc but it shouldn't warp in that short space of time unless you brake like a MotoGP rider and even then only when you sit with the front brake held afterwards. Is it fixed correctly? Are the fixings loose? Worth a check over with a spanner before landing back at the dealers perhaps.

[Norm]

Trevor Indian version of ABS

[Alan R]

Hello there TREVORCH----- welcome back to earth with a bump ! (ie Enfield ownership )--- Are you getting any "pumping" sensations at the brake lever at all ?? If the disc is running at a slight angle it acts as like a Swashplate pump in effect..... Take a look at this }----- http://en.wikipedia.org/wiki/Swashplate ------ Yes, I agree with STRINGER, check the fitments initially... I have a disc conversion on my current 2005 Classic 500 (and I actually fitted one on a previous Bullet 65)---neither of these have given any trouble at all---despite the 65's baptism of fire being to hold the bike steady as I free-wheeled down the Great Orme Headland a few years ago}---- http://en.wikipedia.org/wiki/Great_Orme ------ When you say "you can see the front pulsing-----" what exactly are you looking at ?? Are the fork sliders/bushes worn ?? Headstock bearings adjusted properly ?? These discs are of the "non-floating" type so NOTHING should be loose as far as the disc is concerned....The calliper is a "twin-piston" type with an opposing reaction arm (or plate).... It is ESSENTIAL that the pistons are free to move in their respective housings, and that the reaction plate is also free to move on the two pins carrying it....If this situation is NOT met then an out-of-balance force will exist across the disc forcing it to the one side or the other...... A regular check on the wear pattern will give you early warning of anything untoward. Unfortunately I think my mate Paul "Have rockers--will sell" Grunda could also be right ( Hi matey !!). If this is still a Warranty issue then thats' GOT to be your first port of call---- if only due to a diminishing time factor.

[Alan R]

--------On the left of this page, have a look at our hosts "Parts Book Online"---- 500cc Indian Bullets -----2005 Electra X -----diagramme No. 30 ---- This gives a good schematic of the set-up.

[grunda 12]

hi alan !!don,t tell everyone about the rockers don,t want to rock the boat !!!atb paul.

[trevorch]

High All again,

I do not brake hard enough or long enough to overheat the disc, so I set to one side another warped disc. All the mountings of the disc and the calliper are correct. I watched the dealer carefully torquing everything up. The sensation I feel is that the braking force changes as the disc rotates, so it is trying to push the forks back with a variable force. This is no sign on the disc itself of any uneven ear on either side. When I lift the wheel and turn it by hand, I can feel some drag, but then after the brake handle has been released there is nothing that would cause the pistons to retract, so the pads remain in very light contact with the disc. Compared to my new Piaggio, this has no variation in braking force either on the left or right front disc. The Piaggio X10 has a floating discs whereas the EFI is solidly mounted on the hub. I think I will remove the calliper, check the pads and spray the whole thing with brake cleaner, as a first step. Worn fork or head races, do not think so after only 6,000km.

Thanks for your tips and I will remeasure the runout shortly to see if there is any swash plate effect as Alan R mentioned.

Flying lessons continue.

Cheers TrevorCH

[grunda 12]

hi trevorch ,the disc doesn,t need to have got warm to be warped it may have been manufactured like that,only a suggestion atb paul.

[Norm]

Trevor, I fitted a disc recently to Bullet and I found under braking the head of the studs holding the disc on would rub on the caliper as it rotated, giving a lurching feeling