80CB750F
CB750 New member
Hey folks,
I signed up to the forum because I need a substantial amount of help.
I have a 1980 CB750F and it has about 25k miles on it. It all started on a ride home from work. I found my brakes to be more and more taunt everytime I stopped. Turns out my pistons we not releasing as they should have and I ended up stopping and having to release the calipers by bleeding the pressure to get home.
I tried bleeding the brakes and then the master cylinder stopped working. Upon closer inspection I found a SUBSTANTIAL amount of grit grime and other crap that clogged up the whole works. I ordered a new master cylinder kit as well as a new reservoir. I also cleaned both calipers and reattached them. I attempted to refill the lines with fluid and nothing was working. So I worked from the calipers up to find that even when I took the Banjo Bolt off the M/C assembly I could not get Fluid to pump. I cleaned and boiled everything so I thought I was good to go. What would prevent the m/c from pumping up at the top? I notice that in the assembly that there are two drilled holes. One is open and I can see the cylinder moving as I pull the handle. The other one appears as though it was never drilled through to begin with. Are both ports meant to be open? (seems like a stupid question, however that clog looks like metal.) I hope that is the only issue however I feel I would have to drill the hole to clear it and want to be absolutely certain prior to doing so. I decided to purchase a pump to pull the fluid from the bleeders in the calipers if my issue truely is just rouge air bubbles.
On a second note. When I ordered the brake kit items I decided to throw in new drag bars. I went from the stock 4" rise to 0" rise and lost some width from the sides. My clutch cable performed fine, but my throttle was really sticky. I have it in my mind that I need shorter throttle cables but wanted to see if there are any suggestions to avoid that purchase as well.
Thank you!
I signed up to the forum because I need a substantial amount of help.
I have a 1980 CB750F and it has about 25k miles on it. It all started on a ride home from work. I found my brakes to be more and more taunt everytime I stopped. Turns out my pistons we not releasing as they should have and I ended up stopping and having to release the calipers by bleeding the pressure to get home.
I tried bleeding the brakes and then the master cylinder stopped working. Upon closer inspection I found a SUBSTANTIAL amount of grit grime and other crap that clogged up the whole works. I ordered a new master cylinder kit as well as a new reservoir. I also cleaned both calipers and reattached them. I attempted to refill the lines with fluid and nothing was working. So I worked from the calipers up to find that even when I took the Banjo Bolt off the M/C assembly I could not get Fluid to pump. I cleaned and boiled everything so I thought I was good to go. What would prevent the m/c from pumping up at the top? I notice that in the assembly that there are two drilled holes. One is open and I can see the cylinder moving as I pull the handle. The other one appears as though it was never drilled through to begin with. Are both ports meant to be open? (seems like a stupid question, however that clog looks like metal.) I hope that is the only issue however I feel I would have to drill the hole to clear it and want to be absolutely certain prior to doing so. I decided to purchase a pump to pull the fluid from the bleeders in the calipers if my issue truely is just rouge air bubbles.
On a second note. When I ordered the brake kit items I decided to throw in new drag bars. I went from the stock 4" rise to 0" rise and lost some width from the sides. My clutch cable performed fine, but my throttle was really sticky. I have it in my mind that I need shorter throttle cables but wanted to see if there are any suggestions to avoid that purchase as well.
Thank you!