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Hydo brakes return line.



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Old 03-13-2013, 07:39 AM   #1
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Hydo brakes return line.

I know this isn't new to those who know hydo systems. But I didn't know and a bunch of people I asked about the problem didn't know so here it is.

I installed Hydo assist to my brake system like last year sometime and have been happy I did. Until a odd thing started happening. When I started the engine the brake peddle would move about 3/4 to 1 inch and the dam brakes would be applied. Not much and seemed to go away after everything warmed up. So I started searching for answers and found some useful info and solved the problem. I had both return lines run into a common filter housing then to the reservoir. This was causing back pressure on the return of the Hydo boost unit. I built a reservoir with two returns and the problem is completely gone. I have a suspision the filters may be more restrictive than when they were new. I'm going to change them.

I used some 3/8" brake line for the returns and a shock bushing for the line on the bottom feeding the pump.


Look carefully at the writhing near the bottom of the canister LOL
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Old 03-13-2013, 08:30 AM   #2
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I am having issues with my brakes dragging as well, and I have a common return line. I also recently added a filter, but the problem is not new with the new filter. My pump was weak for a while and I started noticing the issue once I got the pump pressure back up with a new bypass valve. I also have not noticed my pedal dropping, but I am going to investigate this.

I dont have TIG real available to me to add another return in the resevoir, but I can probably pay someone to add one if it is really needed. I was thinking I had a problem with my hydroboost itself, but maybe not.

Is anyone else seeing this issue?
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Old 03-13-2013, 09:04 AM   #3
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Never had an issue, but, I don't run a filter... Good catch!
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Old 03-13-2013, 10:41 AM   #4
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Never had an issue, but, I don't run a filter... Good catch!
Is your return T'ed or independent return to the res.?
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Old 03-13-2013, 11:04 AM   #5
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Old 03-13-2013, 12:02 PM   #6
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Kru is good vodka. That's all the tech I can offer.

They make a half gallon bottle too that's huge! Nice job!
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Old 03-13-2013, 05:58 PM   #7
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Quote:
Originally Posted by Turbos10 View Post
I am having issues with my brakes dragging as well, and I have a common return line. I also recently added a filter, but the problem is not new with the new filter. My pump was weak for a while and I started noticing the issue once I got the pump pressure back up with a new bypass valve. I also have not noticed my pedal dropping, but I am going to investigate this.

I dont have TIG real available to me to add another return in the resevoir, but I can probably pay someone to add one if it is really needed. I was thinking I had a problem with my hydroboost itself, but maybe not.

Is anyone else seeing this issue?
My brakes would drag when the engine was running then release when I killed the engine. Is that what yours do?
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Old 03-13-2013, 06:04 PM   #8
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Quote:
Originally Posted by Awesome Bill View Post
Kru is good vodka. That's all the tech I can offer.

They make a half gallon bottle too that's huge! Nice job!
I wouldn't know if it's any good or not. The bottle just showed up on top of tool box about 3 months ago. I was going to make roll over catch bottle out of it just never got around to it.

It was a little thin for my mig but just went slow tac tac tac.

I changed the filters today I'm going to cut them open to see whats inside.
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Old 03-13-2013, 08:03 PM   #9
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Quote:
Originally Posted by Elcaminoman View Post
My brakes would drag when the engine was running then release when I killed the engine. Is that what yours do?
Yup, seems to be. I have not done alot of testing really. I noticed it alot last weekend at Gilmer when I was trying to take off in high range. In low I never noticed. This was really the first time I used it in high range much. I have noticed it hard to take off before in high, but it just dawned on me what was happening. Its not enough to cause the brakes to heat, but just enough to be hard to take off.
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Old 03-13-2013, 10:22 PM   #10
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My previous research found any restriction in the fluid return resulted in the system applying itself(brake pedal actuation, dragging of brakes). I just made sure I used a hydroboost pym) can. It has 2 return line ports. Even a "T" fitting causes it, use a "Y".
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Old 03-14-2013, 06:28 AM   #11
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This is how I have mine now:

http://www.pscmotorsports.com/pdf/te...hydroboost.pdf
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Old 03-14-2013, 09:08 AM   #12
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Thinking I can use one of these instead of having it welded. This way I dont even have to pull the res. off. I'll have to measure and figure out hose routing so I can order some hose from surplus center. I can get make hoses for the cost of the ends if bought locally.

http://www.summitracing.com/parts/sum-220682
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Old 03-14-2013, 11:15 AM   #13
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I can get u AN fitting is you need some!
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