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Brake rotor configuration puzzle Mon May 24, 2021 7:20 am
tinyspuds
![tinyspuds](https://2img.net/u/4211/29/48/93/avatars/5765-46.jpg)
Life time member
![Life time member Life time member](https://i.servimg.com/u/f80/11/71/56/74/bmw-5s10.gif)
The pads are now binding against the rotor. On inspection I saw that the pads are resting against the outer of the two concentric rings on the rotor.
![Brake rotor configuration puzzle 72d2a910](https://i.servimg.com/u/f43/20/02/79/70/72d2a910.jpg)
The ring outside the ones that house the rivets.
The bottom edge of the pads are just caught by the ring, creating a shallow crescent of contact.
![Brake rotor configuration puzzle 0479d910](https://i.servimg.com/u/f43/20/02/79/70/0479d910.jpg)
This outer ring is c. 10mm wide where it is proud of the rotor. My old rotors show a trace of this ring and the outer circumference is burnished and worn down so that only about 5mm width remains proud.
The contact area of the rotor is just a touch under 5mm thick. This is obviously only a slightly used pair of rotors (possibly even from the K1100 - which I understand is thicker). All the rotor measurements seem otherwise the same as the ones I swapped out (Outer diameter, circumference to rain slot start, rain slot bottom to centre.
Is this ring that is making contact with the pads normal for a newish rotor and expected to just wear in during use.
Haven’t tested yet as still flushing the brake lines.
Last edited by tinyspuds on Mon May 24, 2021 7:23 am; edited 1 time in total (Reason for editing : clarity.)
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1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106.
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
2000 Hayabusa with Charnwood chair, Wasp forks and EZS wheels.