Rear Brake Rotor

johnreeder

Friend of God
Joined
Dec 8, 2006
Messages
192
Location
Southern Illinois
Ride
R3T 2008
I installed different tires and wheels and when I torque everything down the rotor rubs against the caliper holder. The only thing I can think of that might be the problem is the rotor was installed wrong. Does anyone know if this is possible? Can the rear brake rotor be installed wrong?
 
In as much as the rotor (if you had it off) has no spacers between itself and the wheel spider, that would lead me to believe that you've forgotten the spacer that goes between the caliper bracket and the and the wheel. You have wheel, spacer, barcket and then swingarm.

If the rotor is rubbing the pads a bit, that's ok. The first application of the brakes will center the pads anyway. Pad to rotor clearance is a direct result of the puck seals resisting the outward movement of the pads.
 
R/Rotor

What I have is wheel, spacer, caliper bracket, and swing arm. When I tighten everything down the rotor rubs the caliper bracket. I'm wondering if the rotor is slightly bowed one way or the other. Meaning it has to be mounted one way only. Something is causing the rotor to be too close to the bracket. I've checked everything I can think of. I hate to remove the wheel again unless I have to.
 
I don't see that there would be a spacing issue with the rotor being mounted wrongly. Is there a sunny side and a darkside? Perhaps it is the wheel upon which it is attached. Measure both original and new wheels: From centerline of each to the rotor mounting surfaces. Are you sure you put a pad on each side of the rotor
 
If, you removed the rotor from the wheel and at any time you overheated the rotor, when you remove it, it will dish. That is a condition of the material itself and it's not correctable except with a new rotor. I had that happen on my sidecar outfit, I overheated the rotor and when I replaced the pads I took the rotor off to resurface it and had to get a new one. There is no way you can flatten the rotor once you remove it. Ther is a definite inside and outside to the rotor and the way it mounts and the rotos has to sit on the mounting boss evenly and with no dirt or aluminum oxide (white rust) on the bosses themselves.

Acceptable runout (the maximum indicator deviation in one complete 360 degree rotation of the wheel) with the indicator placed in the swept area of the disc is 0.15MM or 0.02".

That isn't much so it's imperative that the disc is properly seated on the mounting boss. The torque for the mounting bolts is 22Nm dry. They have to be torqued in an 'X' pattern progressively.
 
Rear Rotor

I appreciate everyone's response. I still haven't found the problem yet. The wheel I'm using is another R3 wheel only chromed. I'm not sure what year it's from but, I think they're all the same with the exception of the new Tourer. It's the caliper carrier that's rubbing. I've had it off several times now and can't find anything wrong with it. It's mounted on a slide. As the pads move the mount slides. The problem is the mount slides so much that it passes the pad and contacts the rotor in place of the pads. I'm thinking of installing the old tire and wheel to see if it still rubs. I'll call my Triumph store tomorrow to see if they can share some light on this very frustrating situation.

Thanks,
 
Rear Brake Rotor Rubbing

I'm sorry I haven't posted a photo. I think I've stood around scratching my head long enough. The problem is, I have too much space between the swing arm and caliper bracket. When I loosen the axle nut the rubbing stops because the caliper bracket moves away from the rotor. I'm going to try installing a washer to use as a spacer to take up the extra room. I'm almost certain that will fix it. The only problem is I can't figure out why I have to do this. I'll report back after I try my fix and let everyone know how it went.

JR
 
Do the new wheels have the correct bearings in them? I am assuming that they are exchange, even check to see if there are bearings at all in there. Sometimes the obvious eludes us, I know it kicks the **** out of me all the time.
 
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