V-MAN
01-07-2004, 02:39 PM
I just got around to installing the new chrome calipers on the Valk. I have been admiring them for awhile now sitting in a box in the living-room! I just got all the new lines and fittings so now I just needed to find the time.
After re-building the calipers and tapping out all the threaded portions I hung them on the bike. I should have known things were going too easy :? I have been using a Mity Vac for years and it works perfect ... EXCEPT when you have a fresh caliper I found out!
I used the Mity Vac on the lines and had clear brake fluid and NO air at all. After finishing with the right side caliper I stood up and grabbed the brake lever - straight the the bar ... no resistance at all. :shock: I kind of stood there in disbelief. I had just bleed them down and had zero air. I got to thinking - when I do a master cylinder I always "bench bleed" it first because it saves so much time. I figured OK well I will try this method with the calipers and see what happens. I pulled the calipers back off the bike. I put a flat piece of AL stock I had between the brake pads and shot 20 PSI into the caliper with air compressor. It forced the pistons out furthur (just enough space for the rotor was left. I then took a straw with my finger on the top and transferred brake fluid into the caliper by hand. It took a lot of fluid this way! After filling them both by hand I put them back on the bike. I used the Mity Vac to clear the lines AGAIN :? When I finished up with the Mity Vac I checked the lever once again ... I had brakes now!
So if you have new calipers or master cylinder and new lines going on at the same time remember this story. Maybe it will save you some time or frustration!
Anyway here are a couple pictures of the "finished" project ... I stilll have to get a couple line clamps so I can loose the wirer tie I used!
http://www.v-man.org/images/Posting%20Folder/posting/Caliper1.jpg
http://www.v-man.org/images/Posting%20Folder/posting/Caliper2.jpg
After re-building the calipers and tapping out all the threaded portions I hung them on the bike. I should have known things were going too easy :? I have been using a Mity Vac for years and it works perfect ... EXCEPT when you have a fresh caliper I found out!
I used the Mity Vac on the lines and had clear brake fluid and NO air at all. After finishing with the right side caliper I stood up and grabbed the brake lever - straight the the bar ... no resistance at all. :shock: I kind of stood there in disbelief. I had just bleed them down and had zero air. I got to thinking - when I do a master cylinder I always "bench bleed" it first because it saves so much time. I figured OK well I will try this method with the calipers and see what happens. I pulled the calipers back off the bike. I put a flat piece of AL stock I had between the brake pads and shot 20 PSI into the caliper with air compressor. It forced the pistons out furthur (just enough space for the rotor was left. I then took a straw with my finger on the top and transferred brake fluid into the caliper by hand. It took a lot of fluid this way! After filling them both by hand I put them back on the bike. I used the Mity Vac to clear the lines AGAIN :? When I finished up with the Mity Vac I checked the lever once again ... I had brakes now!
So if you have new calipers or master cylinder and new lines going on at the same time remember this story. Maybe it will save you some time or frustration!
Anyway here are a couple pictures of the "finished" project ... I stilll have to get a couple line clamps so I can loose the wirer tie I used!
http://www.v-man.org/images/Posting%20Folder/posting/Caliper1.jpg
http://www.v-man.org/images/Posting%20Folder/posting/Caliper2.jpg