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Bleeding Brakes

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mhealydds

Joined: 17 May 2015
Posts: 30
Location: Wichita, KS

Posted: Sun Apr 10, 2016 9:36 am Post subject: Bleeding Brakes

Any thoughts.....I have trying to bleed my brakes as per instructions in Grove brake instructions (pumping up with oil can) to test for leaks and such. I have done it twice and seem to get same result. I get a great hard pedal on pilot (left) side for both right and left brakes but cannot get seem to get same result on co-pilot (right) side for either pedal. What am I doing wrong here?

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jesse(at)saintaviation.co
Guest

Posted: Sun Apr 10, 2016 9:53 am Post subject: Bleeding Brakes

Are you sure you have the lines routed correctly?



Jesse Saint

Saint Aviation, Inc. 

jesse(at)saintaviation.com

C: 352-427-0285

F: 815-377-3694



Sent from my iPhone



 	  Quote: 	
		   On Apr 10, 2016, at 1:36 PM, mhealydds <mhealydds(at)gmail.com> wrote:

 

 

 

 Any thoughts.....I have trying to bleed my brakes as per instructions in Grove brake instructions (pumping up with oil can) to test for leaks and such. I have done it twice and seem to get same result. I get a great hard pedal on pilot (left) side for both right and left brakes but cannot get seem to get same result on co-pilot (right) side for either pedal. What am I doing wrong here?

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=454797#454797

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Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Sun Apr 10, 2016 10:00 am Post subject: Bleeding Brakes

We had similar issues when first activating the system, and again when 

replaced "O" rings.  Finally got tired of fiddling with it and while 

applying pressure on the right wheel cylinder input nipple, cracked the line 

at the co-pilot foot pedal to get the air out and it solved the problem.



Later, - Lew



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NOW OFICIALLY BUILDER #40549
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kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Sun Apr 10, 2016 10:07 am Post subject: Re: Bleeding Brakes

Hi



When I was first bleeding my brakes I had a b*tch of a time getting it done right. The problem was one of the pedals was ever so slightly forward so that the valve in the cylinder was closed and the cylinder was not being bled.



I suggest you check that the pedals are all fully back so that the cylinder valves are open when bleeding.



If you a park brake, be sure it is disengaged as well. Don't ask about how I know that little gem....

Cheers



Les

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Dave Saylor

Joined: 11 Jan 2015
Posts: 209
Location: GILROY, CA

Posted: Sun Apr 10, 2016 10:09 am Post subject: Bleeding Brakes

I use a pressurized brake bleeder from ATS:  http://www.aircraft-tool.com/shop/detail.aspx?PRODUCT_ID=225DX



I just use a 1/4" tube just pressed onto the bleeder instead of the rig they supply.  They both leak about the same.  The trick is to keep the pot pressurized and keep the flow rate high enough to grab the little bubbles that get stuck to the sides of the tube.  It's probably overkill but I tapped a pressure gauge into the pot.  I keep it around 15 PSI.

You'll get more bubbles out the reservoir if you slowly move each brake pedal off it's stop.

Also, you might try putting a drop of hydraulic fluid on the top of the cylinder to re-wet the seal, especially if air seems to be entering like a slow leak.

--Dave

On Sun, Apr 10, 2016 at 10:36 AM, mhealydds <mhealydds(at)gmail.com (mhealydds(at)gmail.com)> wrote:

 	  Quote: 	
		  --> RV10-List message posted by: "mhealydds" <mhealydds(at)gmail.com (mhealydds(at)gmail.com)>

 

 Any thoughts.....I have trying to bleed my brakes as per instructions in Grove brake instructions (pumping up with oil can) to test for leaks and such. I have done it twice and seem to get same result. I get a great hard pedal on pilot (left) side for both right and left brakes but cannot get seem to get same result on co-pilot (right) side for either pedal. What am I doing wrong here?

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=454797#454797

 

 

 

 

 

 

 

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carl.froehlich(at)verizon
Guest

Posted: Sun Apr 10, 2016 10:37 am Post subject: Bleeding Brakes

Another trick I use to get the air out.  Attach a 1/4" AN fitting (1/8" pipe

thread) to the top of the brake reservoir.  From this fitting attach a short

U of 1/4" aluminum tubing and end in a jar.



The problem I had was getting the air out.  With this set up I can pump from

the caliper and watch the air bubbles come out of the reservoir.  I had to

pump a lot of fluid to get the last air bubbles out.



Carl



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