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shadowmagic
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« on: July 27, 2021, 04:54:33 PM » |
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So I was bleeding the rear brakes and running all the fluid through and it was going fine, then it just lost pressure. The rear brake pedal wont pressurize at all. I disconnected the brake line at the caliper to see if any fluid would come through when I apply the brake but nothing. It had plenty of brake fluid. Any ideas anyone?
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Chrisj CMA
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« Reply #1 on: July 28, 2021, 05:12:44 AM » |
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Get a syringe and push brake fluid up from the bleeder zerk until it gets to the reservoir. Remove any excess fluid from the reservoir.
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« Last Edit: July 28, 2021, 10:30:30 AM by Chrisj CMA »
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jnicks01
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« Reply #2 on: July 28, 2021, 05:46:19 AM » |
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You might have gotten air in the system somewhere when doing to bleed, and a bubble is hung up somewhere. Even some tapping on the MC, line, or caliper can dislodge a bubble.
Like Chris said above, do a reverse bleed, or try using a check valve tool like the ones from motion pro. Some also like speed bleeders.
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I want to scoop out your brains and eat your knowledge.  |
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shadowmagic
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« Reply #3 on: July 28, 2021, 08:36:34 AM » |
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Thank you for the tips. I was reading these brakes may be connected with the front brakes? and you have to bleed them together? does anyone know if this is true? I will try and reverse bleed. I used a bleeder I bought online that uses a one way valve. Anyway, thank you all for the tips.
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The emperor has no clothes
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« Reply #4 on: July 28, 2021, 08:39:37 AM » |
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Thank you for the tips. I was reading these brakes may be connected with the front brakes? and you have to bleed them together? does anyone know if this is true? I will try and reverse bleed. I used a bleeder I bought online that uses a one way valve. Anyway, thank you all for the tips.
No, that’s not true. |
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Skinhead
Member
Posts: 8724
J. A. B. O. A.
Troy, MI
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« Reply #5 on: July 28, 2021, 09:37:32 AM » |
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It sounds to me like you did not remove the old brake fluid and clean the master cylinder before bleeding? You may have gotten foreign mumpuck in the passage linking the reservoir to the MC piston. Reverse bleeding may dislodge anything that may be preventing fluid from flowing into the cylinder.
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 Troy, MI |
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hubcapsc
Member
Posts: 16772
upstate
South Carolina
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« Reply #6 on: July 28, 2021, 09:41:01 AM » |
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It sounds to me like you did not remove the old brake fluid and clean the master cylinder before bleeding? You may have gotten foreign mumpuck in the passage linking the reservoir to the MC piston.
I got that idea too... sounds like it was working right, then stopped...
-Mike
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shadowmagic
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« Reply #7 on: July 28, 2021, 09:56:12 AM » |
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I've started taking apart the brake line and assume there is a blockage in there. I suppose it would better at this point to order and aftermarket brake line set? I have to paint the tank anyway so I may as well remove it and replace the brake line right away? does that seem like the thing to do? Any help much appreciated. And yes, I didnt clean it out before bleeding.
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The emperor has no clothes
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« Reply #8 on: July 28, 2021, 10:08:24 AM » |
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I've started taking apart the brake line and assume there is a blockage in there. I suppose it would better at this point to order and aftermarket brake line set? I have to paint the tank anyway so I may as well remove it and replace the brake line right away? does that seem like the thing to do? Any help much appreciated. And yes, I didnt clean it out before bleeding.
The blockage could be in the master cylinder itself. Changing brake lines would do you no good. If it were me at this point, I’d take the master cylinder off and clean it on the bench. Then I’d shoot brake fluid thru the line to make sure it was clear. It wouldn’t be a bad idea to also remove the caliper and clean it also. |
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hubcapsc
Member
Posts: 16772
upstate
South Carolina
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« Reply #9 on: July 28, 2021, 10:57:57 AM » |
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I suppose it would better at this point to order and aftermarket brake line set? The OEM rear brake lines are "no longer available"  The master cylinder and the master cylinder rebuild parts are still available though  ... Hope you get it figured out soon... -Mike
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shadowmagic
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« Reply #10 on: July 28, 2021, 10:59:22 AM » |
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ok, thank you everyone. I'll start by cleaning out the master cylinder and then try blowing out the brake lines again with brake cleaner.
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Skinhead
Member
Posts: 8724
J. A. B. O. A.
Troy, MI
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« Reply #11 on: July 28, 2021, 11:37:56 AM » |
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I would get what you have working before I spent money on replacing lines. Your money would probably be better spent on rebuild kits for the MC and Calipers. JMHO. Good luck.
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