I have a set of Brembo discs that have quite a lot of movement on the bobbins and the discs are in good order regarding thickness, they have done some 20,000 miles. I would like to reverse their direction to stop anymore wear and get rid of the clonk I get when braking. They have no directional arrows so would it be a good idea to rotate them? I have no ABS to worry about and they are the same. What you think?
Are they perfectly symmetrical, if you took them off and randomly rotated them whilst blindfolded would you then be able to identify any distinguishing original features that might indicate a direction of rotation ?
I reckon will be ok, will be just like taking wheel off and inadvertantly swapping the sides they go on when putting back together again. When new ones come in a box, they go on any side right ? So, I agree, why not ??
As above, give them a good clean and remove any gum or residue that might be on the disc and then change them over. I guess you could even change the pads over so they will at least better match the disc if you have any grooves etc. From my point of view, I have never seen any information that states non-directional discs cannot be swapped over.
If the bobbins are excessively worn, rotating the disc in the other direction won't lose the clonk, if the clonk is the disc and not the forks. For what it''s worth, if it were my discs I'd change them. The bobbins are the only thing holding the rotor to the centre so failure would be catastrophic. Andy
On my Guzzi I've had 2 sets of discs from different manufacturers and both times they came marked as left and right side although for the life of me I could see no difference in the disc. I contacted one of the manufacturers to ask out of interest why and was told it was to do with the drilling pattern of the holes on the disc. I guess if they are fitted one way they shed water or perhaps heat better than the other, it's got to be marginal though. Personally I ran the first set, both ways and noticed no difference whatsoever, but I just road ride and don't do track days. Excessive wear in the bobbins though would be a concern to me and I'm in 100% agreement with @Android853sp, I'd renew them. I could just be being ultra cautious but for me front brakes are the number one item I wouldn't take any chances with
By all means reverse them if you choose. But why do you imagine that would (a) stop any more wear; or (b) get rid of the clonk? I cannot see why it would do either of those things.
My theory would be that the bobbins have ovalised the hole by just having force one way, and probably the reason why is that the bobbins are made of stainless steel and the carrier is alloy .I am disappointed by the fact they only have done minimal mileage compared to the original versions which were not expensive Brembo units that covered far more mileage .
Increasingly brake components, including discs, are consumable items with a trade off between performance and longevity. You pays yer money...
Since riding motorcycles with disc brakes, I cannot remember getting 20,000 miles out of a disc, ever. Recently changed the Multistrada at 15,000 because they were thin and warped and I considered myself lucky I got 15,000 ! Andy
Change the bobbins,that clunk is a gap,IE:wear/movement,if you continue to use them like that you may damage the carrier thus scrapping the disc,bobbins are cheap compared to new discs! Side play is ok but lateral movement is at least a mot failure if not a complete failure,
I thought that it was the alloy carrier that the bobbins wear, more than the disc. The discs may be ok but the carriers knackered..
That's strange,I fitted a fully floating bobbin set on my 851 from blackshadow about 2 mths ago,they fitted perfect,I had to add a extra shim which they supplied(I didn't use the spring washer) the discs feel and operate fine and have less play than my mates 900sl which has the factory f/floating discs!
