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Front brake master cylinder ??

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warren1290
L Plate Warrior



Joined: 14 Jul 2010
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PostPosted: 22:59 - 14 Jul 2010    Post subject: Front brake master cylinder ?? Reply with quote
Hi, im new to the bike world.

I recently bled the front brake fluid . and im having difficulty putting the fluid back in the system.

Am i right saying tht u put the fluid back in thru the master cylinder and pump the brake ??? if i am the cylinder is not pushing the fluid thru the system?

I have a kawasaki kdx. please when replying take in that i am new and a complete retard !!!

cheers
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Casper
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Joined: 12 Jul 2010
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PostPosted: 23:04 - 14 Jul 2010    Post subject: Reply with quote
Try it with the bleed nipple undone so the air can flow out when the fluid runs down, tighten when fluid starts to dribble out. Now bleed brake
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warren1290
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Joined: 14 Jul 2010
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PostPosted: 23:08 - 14 Jul 2010    Post subject: Reply with quote
1888 wrote:
Try it with the bleed nipple undone so the air can flow out when the fluid runs down, tighten when fluid starts to dribble out. Now bleed brake


Cheers, but i have taken the master cylinder out of the system and tried pumping it not connected and its not pushing the fluid.but when i put my finger over the hole theres suction. please help i feel such a retard
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Casper
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PostPosted: 23:16 - 14 Jul 2010    Post subject: Reply with quote
Why are you fucking about with it when you dont know what you are doing? Hmmm, done now. Stick it all back on as it was then loosen the bleed nipple and tell us if fluid comes out when you pour it in the resevour. If not it has a blockage or you have buggered something. when you say took the master cylender of what exactly do you mean as it is on the handle bar and you dont need to take it of, just open the lid to get the fluid in.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 23:30 - 14 Jul 2010    Post subject: Reply with quote
Hi

Have you drained the system totally? If so it can be a pig to get fluid through again. However if you have just removed the m/c it shouldn't be too bad. If so then connect it back up, fill the m/c with fluid and pull the lever VERY lightly and release it. Keep doing this. Just pulling the lever enough to dislodge air bubbles back into the reservoir.

All the best

Keith
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warren1290
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Joined: 14 Jul 2010
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PostPosted: 23:31 - 14 Jul 2010    Post subject: Reply with quote
1888 wrote:
Why are you fucking about with it when you dont know what you are doing? Hmmm, done now. Stick it all back on as it was then loosen the bleed nipple and tell us if fluid comes out when you pour it in the resevour. If not it has a blockage or you have buggered something. when you say took the master cylender of what exactly do you mean as it is on the handle bar and you dont need to take it of, just open the lid to get the fluid in.


I Wasnt "fucking about" i took it off because my initial thought was a blockage ! If it is a blockage what is the best way of cleaning it ? ive been told leaving it in petrol maybe to remove crap if that has gone inside ?
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 23:34 - 14 Jul 2010    Post subject: Reply with quote
Hi

Not really much to get blocked in a m/c. Small hole from the reservoir to the actual master cylinder maybe, but after that it would be under pressure and should dislodge any blockage easily (although that might result in other problems).

All the best

Keith
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warren1290
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Joined: 14 Jul 2010
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PostPosted: 23:35 - 14 Jul 2010    Post subject: Reply with quote
Kickstart wrote:
Hi

Have you drained the system totally? If so it can be a pig to get fluid through again. However if you have just removed the m/c it shouldn't be too bad. If so then connect it back up, fill the m/c with fluid and pull the lever VERY lightly and release it. Keep doing this. Just pulling the lever enough to dislodge air bubbles back into the reservoir.

All the best

Keith

Hi kieth i appreciate your help, yes i drained the sytem totally bad move seeing as im a novice but its to late now.My problem is the brake lever is not pushing fluid from the resevoir to the brake callipers. may it be blocked ? it has suction when i cover the hole with my finger so i assume its still working .. help
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Casper
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Joined: 12 Jul 2010
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PostPosted: 23:37 - 14 Jul 2010    Post subject: Reply with quote
We are talking front here and you have only took the cap of and drained the old fluid out through the bleed nipple yes? if so just do as other poster said. I doubt very much youhave a blockage. What was the brake doing to make you think there was a problem? If they worked but weak you may just have worn pads.
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warren1290
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Joined: 14 Jul 2010
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PostPosted: 23:58 - 14 Jul 2010    Post subject: Reply with quote
1888 wrote:
We are talking front here and you have only took the cap of and drained the old fluid out through the bleed nipple yes? if so just do as other poster said. I doubt very much youhave a blockage. What was the brake doing to make you think there was a problem? If they worked but weak you may just have worn pads.


I bled the fluid then went to put fluid back in thru the resevoir and the resevoir wasnt pushing the fluid thru to the pipe tht lead to the brake callipers
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 23:58 - 14 Jul 2010    Post subject: Reply with quote
warren1290 wrote:

Hi kieth i appreciate your help, yes i drained the sytem totally bad move seeing as im a novice but its to late now.My problem is the brake lever is not pushing fluid from the resevoir to the brake callipers. may it be blocked ? it has suction when i cover the hole with my finger so i assume its still working .. help


Realistically very unlikely to be blocked

From empty it is can be a pig to get fluid through the system. One thing to try is to disconnect the brake line from the caliper, put the end of the hose into a pot with a small amount of brake fluid in it (just enough to cover the end of the banjo and act as a fluid lock). Put fluid in the reservior and pump the lever. This should get fluid through the hose. Then connect it back up.

Bolt the m/c back in place and do as I mentioned above and pull the lever a small amount (all you want to do is move the piston enough to just about go past the small hole from the reservior to the m/c) repeatedly.

Once you have got some pressure in the system then try bleeding it normally. Hose on the bleed nipple going to a pot to catch the fluid, pull the lever hard, undo the bleed nipple and tighten it again. Release the lever and pull it again an repeat.

Note that you should use new crush washers on the banjo bolts when they have been unbolted.

All the best

Keith
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warren1290
L Plate Warrior



Joined: 14 Jul 2010
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PostPosted: 00:07 - 15 Jul 2010    Post subject: Reply with quote
Kickstart wrote:
warren1290 wrote:

Hi kieth i appreciate your help, yes i drained the sytem totally bad move seeing as im a novice but its to late now.My problem is the brake lever is not pushing fluid from the resevoir to the brake callipers. may it be blocked ? it has suction when i cover the hole with my finger so i assume its still working .. help


Realistically very unlikely to be blocked

From empty it is can be a pig to get fluid through the system. One thing to try is to disconnect the brake line from the caliper, put the end of the hose into a pot with a small amount of brake fluid in it (just enough to cover the end of the banjo and act as a fluid lock). Put fluid in the reservior and pump the lever. This should get fluid through the hose. Then connect it back up.

Bolt the m/c back in place and do as I mentioned above and pull the lever a small amount (all you want to do is move the piston enough to just about go past the small hole from the reservior to the m/c) repeatedly.

Once you have got some pressure in the system then try bleeding it normally. Hose on the bleed nipple going to a pot to catch the fluid, pull the lever hard, undo the bleed nipple and tighten it again. Release the lever and pull it again an repeat.

Note that you should use new crush washers on the banjo bolts when they have been unbolted.

All the best

Keith

Thankyou that was the answer i was after, You are the man. Will get this done first thing in the morning CHEERS !!!!!
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bacon
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Joined: 09 Jan 2009
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PostPosted: 13:59 - 15 Jul 2010    Post subject: Reply with quote
you might also find as you have drained your mc, you need to bleed the mc first before you have any chance of getting pressure in the system

*fill res with fluid
*open the banjo bolt next to the mc,
*pull lever back slowly, tighten the banjo bolt before you finish the pull
*slowly let go of the lever, and repeat until fluid starts flowing from the banjo bolt (have a rag held over it so you dont get any on your bike

Now the mc is bled, continue the usual way with the rest of the system, (undo bleed nipple, pump lever, tighten nipple before lever is fully pulled in, rinse repeat), making sure you keep the mc topped up, if air gets in you effectively will be back to square 1

Give it a go, good luck mate, i learnt the hard way with brakes, im pretty handy at them now as a result haha
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