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Post by Jona on Apr 7, 2024 13:44:07 GMT 1
I mean that in two ways !
I was bleeding the brakes and they are bleeding brakes 🤬
I have been trying to bleed the rear brake for the last 3 hours 🤦♂️
The master cylinder has been rebuilt with new seals etc. First I couldn’t get any fluid through and realized the tiny little hole in the master cylinder was blocked. Problem solved or so I thought. No, it just will not seem to bleed up. Big air bubbles initially and then the tiniest bubbles continuously appearing. I cannot get any kind of peddle at all really
Any tips or ideas please guys ?
Steve
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Post by JonW on Apr 7, 2024 13:48:22 GMT 1
hold the pedal down overnight and see if that helps.
Also when bleading take the caliper off and turn it over and around to get the air into the area by the nipple.
The rear can be a pain to do.
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Post by Jona on Apr 7, 2024 13:52:57 GMT 1
hold the pedal down overnight and see if that helps. Also when bleading take the caliper off and turn it over and around to get the air into the area by the nipple. The rear can be a pain to do. Thanks Jon I will try the pedal down overnight and see if that helps. Is that with the nipple open yes ? Hope the fronts go easier 🤦♂️ |
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Post by JonW on Apr 7, 2024 13:56:07 GMT 1
no with the nipple closed. Its to allow bubbles to come up into the master.
Have a search and read around on the forum about brake bleeding it will help.
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Post by Jona on Apr 7, 2024 14:06:02 GMT 1
no with the nipple closed. Its to allow bubbles to come up into the master. Have a search and read around on the forum about brake bleeding it will help. Thanks Jon. Will do |
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Post by Yogi on Apr 7, 2024 14:21:52 GMT 1
I’ve just had a mare doing some brakes 😤
I found if I pump once and hold,undo the nipple and close
Then keep repeating it works really well 👍
I know it sounds too easy but it worked really well on the twin front and back
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Post by JonW on Apr 7, 2024 14:26:56 GMT 1
I think the reason that works well is that youre basically bench bleeding it in situ, its what you do with larger master cylinders (ie cars and above) but we get away with just bolting an empty one on a bike mostly.
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Post by chrisg on Apr 7, 2024 19:32:11 GMT 1
What usually works for me is to force the fluid back up the system from the bleed nipple using a syringe/small piece of fuel pipe. Gently pump it through.
Just bled front brakes using this method. I filled one side up to the splitter, then the other side until no bubbles in the master cylinder, then back to the other side, until clear. Good luck.
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Post by Jona on Apr 7, 2024 19:52:37 GMT 1
What usually works for me is to force the fluid back up the system from the bleed nipple using a syringe/small pice of fuel pipe. Gently pump it through. Just bled front brakes using this method. I filled one side up to the slpitter, then the other side until no bubbles in the master cylinder, then back to the other side, until clear. Good luck. Thanks. I will try tomorrow ! It’s beat me today ! |
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Post by chrisg on Apr 7, 2024 21:09:08 GMT 1
I have fallen fowl of not building the rear master cylinder up correctly on a 400E some years ago. I rebuilt it the same way it was disassembled, however after much head scratching, I realised that the previous owner had built it up incorrectly.
Is everything build back, as per manual?
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Post by Jona on Apr 7, 2024 23:18:23 GMT 1
I have fallen fowl of not building the rear master cylinder up correctly on a 400E some years ago. I rebuilt it the same way it was disassembled, however after much head scratching, I realised that the previous owner had built it up incorrectly. Is everything build back, as per manual? Yeah it’s definitely back together as it should be |
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Post by lcmarky on Apr 8, 2024 7:59:04 GMT 1
I mean that in two ways ! I was bleeding the brakes and they are bleeding brakes 🤬 I have been trying to bleed the rear brake for the last 3 hours 🤦♂️ The master cylinder has been rebuilt with new seals etc. First I couldn’t get any fluid through and realized the tiny little hole in the master cylinder was blocked. Problem solved or so I thought. No, it just will not seem to bleed up. Big air bubbles initially and then the tiniest bubbles continuously appearing. I cannot get any kind of peddle at all really Any tips or ideas please guys ? Steve Sounds to me you're drawing in air & probably through the threads. PTFE tape as a 1st step. |
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Post by lcmarky on Apr 8, 2024 8:02:11 GMT 1
What usually works for me is to force the fluid back up the system from the bleed nipple using a syringe/small piece of fuel pipe. Gently pump it through. Just bled front brakes using this method. I filled one side up to the splitter, then the other side until no bubbles in the master cylinder, then back to the other side, until clear. Good luck. Reverse bleeding can work well. I have a compressor and a Draper vacuum gadget that works most of the time. .. |
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Post by lcmarky on Apr 8, 2024 8:04:20 GMT 1
..also if it helps try and position the system vertically to aid air escapement.
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Post by Jona on Apr 8, 2024 8:16:49 GMT 1
I mean that in two ways ! I was bleeding the brakes and they are bleeding brakes 🤬 I have been trying to bleed the rear brake for the last 3 hours 🤦♂️ The master cylinder has been rebuilt with new seals etc. First I couldn’t get any fluid through and realized the tiny little hole in the master cylinder was blocked. Problem solved or so I thought. No, it just will not seem to bleed up. Big air bubbles initially and then the tiniest bubbles continuously appearing. I cannot get any kind of peddle at all really Any tips or ideas please guys ? Steve Sounds to me you're drawing in air & probably through the threads. PTFE tape as a 1st step. I suspected this myself. I will PTFE them prior to the next attempt 😁 |
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Post by lcmarky on Apr 8, 2024 8:35:40 GMT 1
Sounds to me you're drawing in air & probably through the threads. PTFE tape as a 1st step. I suspected this myself. I will PTFE them prior to the next attempt 😁 I had a similar thing with a HEL front master cylinder. Essentially with the system tightened up I could still draw air with my vacuum bleed kit so there had to be something wrong. I got my PTFE tape out and for some reason checked the HEL box it all came in & only to find they supply the fitting already PTFE taped yet I was using one I already had that wasn't taped. |
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