cleaning front brake disc bobbins / rivets?

[stevierst]

Cleaning the bobbins should make a bit of difference, it has done on a couple of mine in the past when I had pulsing brakes. Cleaning the calipers is always recommended, but sticky pistons are not a cause of pulsing at low speed.

You can tell if they need it if the disk is solid and doesn't move at all, or if there is a grating noise with minimal lateral movement of the disk.

Nut and bolt through the bobbin with loads of brake cleaner when you start turning. Keep going until the bobbin is free, but don't be tempted to use a drill like I've seen in the past.

Patience and cleaner is the key!