bleedin' brakes

[gotomuzzi]

Hi, can anyone tell me what I'm doing wrong here.

First off, bike is a Honda xr125. Front brake was sticking on and the lever wasn't springing back so I took the caliper off, and one piston was stuck, I took them both out and cleaned them up and put the caliper back together again, doing this I lost some brake fluid so I thought no bother, I'll bleed the brake.

method 1, pumped brake lever until under pressure and hold lever in, crack bleed nipple let air out, tighten up nipple, release lever and pump lever again until I get pressure. tried this a few times, but I cant get any pressure on the lever, its as slack as a slack thing.

method 2, got some small bore clear pipe and a syringe, attached to bleed nipple, filled pipe and syringe with fluid, got all the bubbles out then with the reservoir cap off tried to push fluid back up the line to the reservoir. tried this but couldn't get the fluid up into the reservoir, I cracked off the banjo at the reservoir and it was getting that far OK.

method 3, same as above but instead of pushing the fluid up I tried pulling the fluid down with the syringe but again the fluid wasn't moving from the reservoir.

So, my question is, am i doing something wrong or is the master cylinder blocked or something?

Thanks for reading!

[jjdugen]

Put clear hose onto nipple, put other end into a jug with enough fluid to cover other end.
Pull Lever in, hold lever, open bleed nipple, close bleed nipple, release lever gradually.
Repeat.
Some bubbles will be seen in the hose. Keep at it until fluid gets through.
Sometimes it helps to remove the caliper and turn it upside down to allow air trapped in the caliper to make its way to bleed the nipple.
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[Rogerborg]

[bladeblaster]

[Fizzer Thou]

https://i1081.photobucket.com/albums/j350/martyzx11/IMG_1656.jpg

Once the master cylinder has been stripped down,ensure that both of the holes in the bottom of the reservoir are clear of any blockages.The smaller one is easily blocked if the system has not been bled with fresh oil for a while.

When reinstalling the seal into the bore of the master cylinder,some people use brake seal grease.In some cases I have seen this grease blocking the smaller hole.A small dress pin would be okay to unblock the smaller hole and a squirt of brake cleaner will flush the casting further.

When bleeding the brake,ensure that the brake line loop from the master cylinder down to the caliper is as straight as possible,so that any air in the system will rise when you pull the brake lever in a small amount.Do this several times until no more air bubbles appear in the reservoir,then bleed the caliper as normal
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