The puck and the caliper piston are two different components in the caliper assembly. Replacement pucks are routinely filed/shaped to fit smoothly into the caliper bore. The piston is what contacts the seal and divides the hydraulic chamber from the atmosphere. But, these pit routinely. The stock pistons are hard chromed steel, I believe. It has always surprised me how badly pitted they can become and still function well and without leakage. Perhaps it is because the pits are in the hydraulic fluid and not actually riding on the seal?
Cheers, Lloyd SOHC4 #11 72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F, 78 750F James Spillane wrote: >Unless you have a micro-lathe you should never "file" the puck at all, you >can't keep it perfectly round and it will leak from the smallest score. > >Jim in NH >SOHC4 #28 > >At 05:05 PM 1/6/04 -0700, Eric Thierbach wrote: > > > >>Hey all, >> >>I remember I had to file away some of the puck material before it would fit >>into the bore of the caliper, perhaps i made it fit loosely and the use of >>sil-slide made no difference in my case? >> >> >>Ride On >> >>eric t. in KY >>sohc4#568 >>'71 CB750 >> >> >> >> > > > >
