BLEEDING BRAKES

[dudehog]

ok, fitted new braided lines to me bike.
the calipers have new seals, all new copper washers, new master cylinder, bleedable banjo bolt and still the lever pulls right back to the grip.
I have a two line system fitted. I have tried doing each one separately and they are rock hard but together not any good. there is no air coming out of the calipers or master cylinder. PLEEEEEEEASE HELP

[lloydie]

New master cylinder ?? From what ?
And hello & welcome

[dudehog]

a genuine honda master cylinder for the firestorm.
hello

[Kev L]

When I did mine I opened each banjo bolt and pumped the system, working down from the M/C to the calipers then bleed the calipers via the bleed nipples. You could also use a syringe or vacume pump to suck the fluid through the system.
Good luck mate.

[dudehog]

tried the vacuum pump and syringe methods. I've tried every conceivable idea and method I know. What I don't understand is why on their own they are solid but together they're rubbish.

[Wicky]

Search for a catheter kit or catheter syringe… post by cybercarl

[dudehog]

But i know there is no air in the system. Not even the tiniest bubble. I've gone through 10l of fluid.
it's the together/seperate thing thats doing my head in. I really don't understand it.

[lloydie]

what size is the master ? its on the bottom

[dudehog]

whatever size the '98 model has. Without going outside in the dar i wouldn't know. But it is the correct part.

[VTRDark]

it's the together/seperate thing thats doing my head in. I really don't understand it.

Strange....

How are you doing each one separate. Wouldn't you not need to disconnect one calliper at the master cylinder which would require a single banjo bolt the bleeding. Test one and then the other.

Have you put a copper washer either side of each banjo at the master cylinder. That's 3 in total.... washer, banjo,washer,banjo, washer. Bolt goes through the lot.



Welcome to the forum

(:-})

[dudehog]

thats exactly what I did. fitted one line at a time and tested the caliper and they were great. Yes I have all the copper washers in place. I have a banjo bolt that I can bleed too. Would a 3 line system be better than a 2 line system?

[lloydie]

whatever size the '98 model has. Without going outside in the dar i wouldn't know. But it is the correct part.

i ask as they have been sold the wrong size before as the 12mm 14mm 16mm all look the the same im thinking you might have a smaller one that cant cope with the larger calipers well thats if you have bleed it correctly

[VTRDark]

thats exactly what I did. fitted one line at a time and tested the caliper and they were great.

Now that is strange that things change once both are connected.

The only thing I can think off, it's the bleeding with two lines connected that is the issue. As you have no issues with the single banjo bolt and single line then the only other thing is the double banjo bleeder bolt. Which one did you fit? I recently fitted a Venhill double banjo bleeder bolt with no problems. It's possibly either the bolt or you still have trapped air in the lines.

The majority of us run a two line race setup.

(:-})

[mik_str]

Get speed bleeders.... have them all around on mine and they work very well.......

[dudehog]

yeah it's a venhill one
I've tried syringing, vacuum bleeding (which i've learnt isn't that great) and conventional bleeding with a valve and hose.
here's a question. When I bleed from all 3 points (that being both calipers and the banjo) and I open by 1/8 of a turn on the nipples there is just fluid coming through. up to 1/4 of a turn it stays the same but past that there are bubbles. BIG BUBBLES. Now is this drawing in air or removing air? If it's removing air then I think i put on the calipers from a jumbo jet because there's so much air.
I have also tried pumping the lever so it's harder, open the nipple so it releases the pressure and (not closing the nipple) let go of the lever. then pulling the lever again air bubbles can be seen coming out of the caliper/banjo bolt again. I know the inside volume of the caliper and there is not that much air in it compared to what came out. so is THAT method drawing in air?
with the entire system closed and squeezing the hell out the lever there are no leaks anywhere.