Unless there is oil, silicone, or some other contaminant on the pads or disk, my vote would be for deteriorated hydraulic lines that are swelling with pressure. I've replaced the hoses on several of my bikes and it made quite a difference on front brake effectiveness. I replaced them with stainless steel braided lines I had made at a local shop here in town. I will eventually put them on all the bikes I am refurbishing.
Cheers, Lloyd SOHC4 #11 72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F, 78 750F Fred Pixley wrote: >What could be the cause of an ineffective front brake on a 1974 CB750K? >I've cleaned the caliper and adjusted the clearance. The master was bled of >air. There is no dragging. The lever action feels quite normal, not spongy >or excessively hard either. When I apply the front brake at speed, it >initially starts to bite, but not strongly and increasing lever pull doesn't >seem to increase the braking power. The hoses are original, but appear in >good condition. Any ideas? > >Fred Pixley >Napanee, Ontario >CB750K3,K4 > > > >
