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Twofeather
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« on: March 28, 2022, 09:09:01 AM » |
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I have rebuild both front calipers right after I rebuild both forks.
I can't seem to get the brakes to pump up to bleed them. Any idea what I'm doing wrong?
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FROM MY DEAD COLD HANDS
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da prez
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« Reply #1 on: March 28, 2022, 09:29:15 AM » |
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Fill master cylinder and blead the left side first , then the right. If that fails , a reverse blead is needed. Not difficult. Remove the pads on one side. Put a 1/4 or so spacer and pump the pistons most of the way out. Keep them fairly even. Make sure fluid does not run low. Push both pistons back slowly. Be sure master cylinder does not overflow. Also make sure brake hose on caliper is at the top. Block the caliper and repeat on the right. I have done this many times.
da prez
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Ramie
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« Reply #2 on: March 28, 2022, 09:29:28 AM » |
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Did you clean out the master cylinder while you were at it. Could be that little bleeder hole in the bottom is plugged. Could also try this guys trick, about 7 1/2 minutes into the video.
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“I am not a courageous person by nature. I have simply discovered that, at certain key moments in this life, you must find courage in yourself, in order to move forward and live. It is like a muscle and it must be exercised, first a little, and then more and more. A deep breath and a leap.”
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Twofeather
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« Reply #3 on: March 28, 2022, 11:15:58 AM » |
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I did suck all the nasty out of master cylinder and put in fresh fluid. Still no change. I wonder should I rebuild master cylinder?
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FROM MY DEAD COLD HANDS
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dizzy
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« Reply #4 on: March 28, 2022, 02:32:30 PM » |
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Air likes to hang out at the front of the master cylinder where the banjo bolt fits in. You can sometimes bleed it out right at that point, Cover cosmetic especially painted stuff, wrap a paper towel around the banjo fitting and carefully break the bolt loose while holding in lever, quickly firm the bolt. If you see some bubbles you're doing the right thing. Repeat a few times while ensuring the master cylinder doesn't run dry. Firmly tighten banjo fitting when done and carefully wipe any excess brake fluid.
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hubcapsc
Member
Posts: 16769
upstate
South Carolina
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« Reply #5 on: March 28, 2022, 03:09:10 PM » |
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People use suction devices (mityvac for example)...
I've never used that, but I have used an old
syringe to suck fluid from the reservoir down
towards the caliper until "normal" bleeding starts working...
-Mike
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sandy
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« Reply #6 on: March 28, 2022, 03:31:09 PM » |
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Tie the brake lever "squeezed" and go have a sandwich. It'll bleed OK after that.
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Hook#3287
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« Reply #7 on: March 29, 2022, 04:34:54 AM » |
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Did you clean out the master cylinder while you were at it. Could be that little bleeder hole in the bottom is plugged. Could also try this guys trick, about 7 1/2 minutes into the video.
Check this. Also a inexpensive bleeder kit helps considerably. |
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laketboy
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« Reply #8 on: March 31, 2022, 12:05:31 PM » |
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I just did the same thing on my newly acquired (Jan 25, 2022) 1999 Standard - rebuild forks, cleaned, painted and rebuilt calipers, new pads, flushed the old coffee brown brake fluid, cleaned the nasty red "mud" from the master cylinder reservoir, bolted up banjo bolts on left and right, filled reservoir. I used a MityVac to pull fluid down left side first, then right, then left and right a 2nd time. ROde her about 10-15 miles, then used MityVac again on front and rear brakes as well as clutch. Like new.
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Keith Claiborne
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Twofeather
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« Reply #9 on: April 14, 2022, 07:15:04 AM » |
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Ok, I have rebuilded the master cylinder, both front calipers, and both forks. I finally got the brakes to bleed, but the calipers will not pump up. I am getting fluid to come out of bleeder port, but the calipers are still lose on rotors. The brake handle still has no pressure behind it like it should. What am I doing wrong? Thanks for your help.
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gordonv
Member
Posts: 5760
VRCC # 31419
Richmond BC
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« Reply #10 on: April 16, 2022, 01:02:54 PM » |
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Not ever have done it myself, but it sounds like air is still getting in. Maybe a not so tight connection?
All new copper washers, on both sides?
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1999 Black with custom paint IS   |
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Twofeather
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« Reply #11 on: April 17, 2022, 05:29:35 AM » |
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Gordon, I ended up buying a Mityvac yesterday. It took me 20 minutes and I was done. I van only assume there was still air trapped in the system. Yes I did use new washers. It is still puzzling that I could get straight fluid out of bleeder but still have air trapped in the system. Oh well aleast I finally got it done. Lesson learned.
Now I got the left brake pad dragging just a little.
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FROM MY DEAD COLD HANDS
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GWS
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« Reply #12 on: April 17, 2022, 08:59:06 AM » |
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You can still get fluid out of the bleeders with a little air in the system. The air likes to migrate upwards, so opening the banjo fitting and leaving it overnight often does the trick.
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luftkoph
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« Reply #13 on: April 17, 2022, 02:42:41 PM » |
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This may sound goofy but on my ZRX with 6 pot calipers they where difficult to get a firm lever after new seals, now that you have used the mity vac try squeezing your brake lever and then put a zip tie on it and leave it like that overnight, and while the zip tie is on gently tap all of your banjo fittings, or like I do use an orbital sander on them, of course remove sandpaper first, this helps any very small air bubbles to migrate up to the master cylinder and out of the hydraulic system .
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Some day never comes
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