pidjones
Over 1,000 Posts
But for the first time, I have gone through the front brakes on a GL1000 (GoldWing) and in less than half a day have full fist. What changed?
Not certain, but I believe that it was a combination of; flushing the lines with brake cleaner followed by compressed air, hooking up the freshly cleaned calipers (mounted with pads, wheel, etc.), mounting the MC, filling the MC then gently operating the lever until fluid came out of the MC outlet before completing connection with the banjo and washers. With 1.5 turns of Teflon gas line (yellow) tape on each bleeder, I first pulled a vacuum on the right caliper with the canister inline and kept refilling the reservoir until fluid appeared in the vacuum canister. Switched to left caliper, pulled vacuum (~15" Hg) and pulled fluid in until fairly bubble-free fluid was coming out (always watching and refilling MC). Switched back-and forth a couple times, occasionally operating the lever. Closed bleeders and pumped to push pads out to the disks. One final cycle after tapping lines and calipers. Got a small bubble from each bleeder after that. Total bled through into the inline vacuum canister (came with the MightyVac) was ~2/3rd canister. Took much less than one small can of DOT3 for a dry dual-caliper (single piston calipers) system refill and bled. Result is a full fist of front brakes! This is the fourth pretty much identical system that I've rebuilt, but the first to go this well. BTW, I replaced the reservoir on this '79 GL1000 (same on '79 CB750F) MC, and the replacement only has two small holes for fluid to pass through. I noticed that the surface tension of the fluid was high enough that it just formed a big bubble under the reservoir and fluid was not getting to the pump. Had to put a Stainless pick down to break up the bubble surface tension and let the volume under the reservoir fill. Worked normal after that.
I still hate brakes, but this was sure a less stressful rebuild than the others.
Not certain, but I believe that it was a combination of; flushing the lines with brake cleaner followed by compressed air, hooking up the freshly cleaned calipers (mounted with pads, wheel, etc.), mounting the MC, filling the MC then gently operating the lever until fluid came out of the MC outlet before completing connection with the banjo and washers. With 1.5 turns of Teflon gas line (yellow) tape on each bleeder, I first pulled a vacuum on the right caliper with the canister inline and kept refilling the reservoir until fluid appeared in the vacuum canister. Switched to left caliper, pulled vacuum (~15" Hg) and pulled fluid in until fairly bubble-free fluid was coming out (always watching and refilling MC). Switched back-and forth a couple times, occasionally operating the lever. Closed bleeders and pumped to push pads out to the disks. One final cycle after tapping lines and calipers. Got a small bubble from each bleeder after that. Total bled through into the inline vacuum canister (came with the MightyVac) was ~2/3rd canister. Took much less than one small can of DOT3 for a dry dual-caliper (single piston calipers) system refill and bled. Result is a full fist of front brakes! This is the fourth pretty much identical system that I've rebuilt, but the first to go this well. BTW, I replaced the reservoir on this '79 GL1000 (same on '79 CB750F) MC, and the replacement only has two small holes for fluid to pass through. I noticed that the surface tension of the fluid was high enough that it just formed a big bubble under the reservoir and fluid was not getting to the pump. Had to put a Stainless pick down to break up the bubble surface tension and let the volume under the reservoir fill. Worked normal after that.
I still hate brakes, but this was sure a less stressful rebuild than the others.
