front discs moving around

Hi Guys after coming home last night I've discovered that if I use My hand and put some pressure on My front discs, outside part is moving is this normal or I need to spend some cash on new ones

Absolutely fine mate. If you look there are discs or collets (round things)that hold the brake part to the wheel anchor. These should be clean and have a small amount of play to allow for expansion when the discs get hot and expand. As long as there is no oodles of play your fine.

Thanx mate I was worried something is wrong , discs on My friend bike don't move at all, on My RSV just a little. You learning something new every day .

The Ape has floating disc's, that is they are connected to the carrier by bobbins (looks like a very large rivet with a hole in the middle) to allow them to move , it is worth checking and freeing up the bobbins every now and again as they can and do get clogged up with muck.

Bobbins, fook i couldnt remember that. Round things lol, getting my coat!

When you get new floating discs there is no play, if you have a small amount of movement that's still ok but if every time you brake they clunk or it feels like your head race bearings are going then they are fooked it always amazes me how some people ride around with their discs literally falling off the carriers cos there that worn out :roll

Interesting point nik, have you ever changed any and is it a f*cker to do?

RSV 69 said:

Interesting point nik, have you ever changed any and is it a f*cker to do?

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Changed what, discs? yeah it's easy just unbolt the old ones & fit new. Or do you mean repair worn discs IMHO I would not repair discs because if there slapping about the carriers are worn because they are softer than the discs & by that time the discs are usually on the limit anyway so bin the lot. I have heard of people who get new discs & fit them to old worn carriers with the circlip type bobbins. The front brakes are something you don't bodge if you want to stay alive there are plenty of good quality after market discs available if you can't afford new Brembo

You answered my question which was has anyone tried to replace bobbins if the disc was still ok but obviously they wont be if bobbins are worn.

Do not confuse Floating discs with Full floating discs. See linky https://www.youtube.com/watch?v=jJPCy2AsULo RSVLUCAS may well have full floating discs fitted and may not know, what is the bikes history etc. My full floaters on my RSVR rattle and stop like hell. Hope the video explains, just my two bobs worth

I know what your saying, all I mean is that if your floating discs look like those full floaters then they are knackered.

Agreed

hello

I hope you won't mind if I borrow this thread...
I am wondering about from disks from mille 98-00 and falco (black ones). Are those all not ok? Because I've heard a lot, that brakes are "shaking" under braking and only solution is replacement for golden ones from 01 on.
What do you say, are black ones really crappy?

butchersdog said:

Do not confuse Floating discs with Full floating discs. See linky https://www.youtube.com/watch?v=jJPCy2AsULo .......

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I appreciate you posting that video butchersdog. However, now I'm wondering about the mechanical difference between the two types of "floating" brakes. What is it that allows the "full-floaters" to move so much without coming apart? :dunno What is structurally different about them when compared to the "floating" discs (or semi-floating in my mind)?

Six5 They don't come apart because the bobbins holding the disc do not allow (well very minimal) rotation around the carrier they provide a lateral movement sideways to the carrier. The bobbins are secured on in a very similar way to fixed discs they just allow the disc to fully centralise on the brake pads under heavy braking and extreme heat conditions.

Motorcycle Brake Systems ¦ Fixed and Floating Brake Discs ¦ BTR Tech Station

To add this is taken from the internet

What is Full-Floating?Full floating rotors, such as were originally conceived, were designed to reduce the tendency towards thermal stress induced distortion due to uneven thermal expansion under load. Prior to the introduction (by Brembo) of this design, brake rotors in the motorcycle industry were simply round discs bolted solidly to the wheel. You may remember if you've been around long enough, the rotors on the early CB750 and Z-1's were nearly 7mm thick and weighed accordingly. This was in effort to keep them from warping. Now days, the only road bikes coming through with solid mount (front) brakes are the Cruisers and budget bikes.

Today's Sportbikes abound with trick features and hardware in every nook and cranny. Brakes too. The brake rotors on them work remarkably well considering their mass-produced (read: stamped) manufacturing process. These are technically semi-floaters as the outer SS blade is nearly bolted solid to the carrier via the stamped stainless steel rivets.

True full-floaters move on the carriers, this allows them to self-center in the caliper for reduced brake drag and "float" unimpeded for unrestricted expansion and contraction during repeated thermal cycling. The only serious down side is a bit of rattle that reminds you these are indeed full-floaters.

Does all this guarantee they won't distort under severe duty conditions? No, unfortunately, there's precious few guarantee's these days. But they do perform as advertised in improving overall braking performance while significantly reducing that distortion tendency.

BTW: All Superbikes, GP machines and the like unanimously have full-floating brake rotors

butchersdog said:

Six5 They don't come apart because the bobbins holding the disc do not allow (well very minimal) rotation around the carrier they provide a lateral movement sideways to the carrier. The bobbins are secured on in a very similar way to fixed discs they just allow the disc to fully centralise on the brake pads under heavy braking and extreme heat conditions.

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Thanks Butchersdog. Good info. I understand the concept, but I would like to see how the lateral movement is controlled. Time to search the web.....

Lateral movement is controlled by the sunken ridge in the bobbins which slots between the disc and carrier or spider as I think you call it in the USA, I'll get a pic up later of a bobbin I have laying around and a disc

As promised pic of the construction of the full floating bobbin arrangement, I hope this will explain it pictorial terms. The washer goes on the bobbin then the circlip in the grove on bobbin. All holds together once the carrier in situ.