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Brake air leak
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danbooker

Joined: 26 Dec 2014
Posts: 29

Posted: Wed May 11, 2016 5:45 pm Post subject: Brake air leak

I heard a hissing, evil, leak of air when I selected my parking brake yesterday. If I release the parking brake, the leak stops. I can apply full brakes with no leaking air coming from the brake cylinder that is under the pilot seat on the right side. However, if I squeeze the paddle hard enough to set the parking brake, the leak starts. Any ideas?

_________________
Daniel Booker
"Stealth-Eagle Aviation"
2312457798
danbooker@hotmail.com

JL2A

Joined: 07 Apr 2015
Posts: 113
Location: Australia

Posted: Thu May 12, 2016 1:58 am Post subject: Re: Brake air leak

when this happened to me is was the rubber grommets in the brake proportioning valve. they flex a little every time the rudder pedal moves and eventually chafe and leak...

dsavarese0812(at)bellsout
Guest

Posted: Thu May 12, 2016 4:04 am Post subject: Brake air leak

Dan,

Give me a call sometime today.  I think I can help you.

Dennis



       From: danbooker <danbooker(at)hotmail.com>

 To: yak-list(at)matronics.com 

 Sent: Wednesday, May 11, 2016 9:45 PM

 Subject: Yak-List: Brake air leak

  

 

--> Yak-List message posted by: "danbooker" <danbooker(at)hotmail.com (danbooker(at)hotmail.com)>



I heard a hissing, evil, leak of air when I selected my parking brake yesterday. If I release the parking brake, the leak stops. I can apply full brakes with no leaking air coming from the brake cylinder that is under the pilot seat on the right side. However, if I squeeze the paddle hard enough to set the parking brake, the leak starts. Any ideas?



--------

Daniel Booker

&quot;Stealth-Eagle Aviation&quot;

2312457798

danbooker(at)hotmail.com (danbooker(at)hotmail.com)





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=456134#4561========================http://www.matronics.com/Navigator?Yak-List<; http://forums.sp;             - NEW MATRONICS LIST WIKI -http://wiki.masp;                     -nics.com/contribution" target="_blank">http://www.matronics.com/contribut===============

bmsim

Joined: 02 Jun 2009
Posts: 32
Location: Alabama

Posted: Sun Jan 07, 2018 12:12 pm Post subject: Re: Brake air leak

I had this exact same issue today when I put the parking brake on for preflight. Brake on, hiss under the rear floorboard, brake off, no hiss. I still have brakes on each side, it's just constantly bleeding down while the brake is applied. What did your issue end up being?



I know there's a brake valve, pressure reducer, and distribution valve in there from the schematics, but I'm unsure where they are or what the most likely culprit might be.



Any help or ideas would be very appreciated!

dsavarese0812(at)bellsout
Guest

Posted: Sun Jan 07, 2018 1:00 pm Post subject: Brake air leak

You are speaking about the brake reducing valve which is under the right 

floor panel in the rear cockpit.ï¿½ That is where the leak is coming from 

when the brake handle is squeezed or locked for the parking brake.ï¿½ 

Remove the floor panon the right in the rear cockpit. Follow the brake 

cables to the brake reducing valve.ï¿½ Remove the two 17mm B nuts from the 

brake reducing valve.ï¿½ Then remove the two mounting bolts with an 8 mm, 

1/4 drive socket and ratchet. Call Doug Sapp, the CJ parts supplier.ï¿½ He 

has overhaul kits for them.



Dennis



A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 1/7/2018 3:12 PM, bmsim wrote:

 	  Quote: 	
		   



 I had this exact same issue today when I put the parking brake on for preflight. Brake on, hiss under the rear floorboard, brake off, no hiss. I still have brakes on each side, it's just constantly bleeding down while the brake is applied. What did your issue end up being?



 I know there's a brake valve, pressure reducer, and distribution valve in there from the schematics, but I'm unsure where they are or what the most likely culprit might be.



 Any help or ideas would be very appreciated!





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=477157#477157

Brake_Reducing_and_Differential_Valves.jpg

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cjpilot710(at)aol.com
Guest

Posted: Sun Jan 07, 2018 1:02 pm Post subject: Brake air leak

If you're talking about a CJ-6 - - -Since your brake handle is only working the QS1 valve, most likely that is where your leak is.  It just may need to be overhauled.  Sapp has a kit for that.  Check that first.

Jim "Pappy" Goolsby

--

dsavarese0812(at)bellsout
Guest

Posted: Sun Jan 07, 2018 1:13 pm Post subject: Brake air leak

I forgot to mention the brake reducing valve is the unit in the upper 

right corner of the photo.ï¿½ Look at the shape.ï¿½ That's what you'll be 

removing.

Dennis



A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 1/7/2018 3:59 PM, A. Dennis Savarese wrote:

 	  Quote: 	
		   You are speaking about the brake reducing valve which is under the 

 right floor panel in the rear cockpit.ï¿½ That is where the leak is 

 coming from when the brake handle is squeezed or locked for the 

 parking brake.ï¿½ Remove the floor panon the right in the rear 

 cockpit. Follow the brake cables to the brake reducing valve.ï¿½ 

 Remove the two 17mm B nuts from the brake reducing valve.ï¿½ Then 

 remove the two mounting bolts with an 8 mm, 1/4 drive socket and 

 ratchet. Call Doug Sapp, the CJ parts supplier.ï¿½ He has overhaul 

 kits for them.



 Dennis



 A. Dennis Savarese

 334-546-8182 (mobile)

 www.yak-52.com

 Skype - Yakguy1



 On 1/7/2018 3:12 PM, bmsim wrote:

> 

>

> I had this exact same issue today when I put the parking brake on for 

> preflight. Brake on, hiss under the rear floorboard, brake off, no 

> hiss. I still have brakes on each side, it's just constantly bleeding 

> down while the brake is applied. What did your issue end up being?

>

> I know there's a brake valve, pressure reducer, and distribution 

> valve in there from the schematics, but I'm unsure where they are or 

> what the most likely culprit might be.

>

> Any help or ideas would be very appreciated!

>

>

> Read this topic online here:

>

> http://forums.matronics.com/viewtopic.php?p=477157#477157

>

>

pfstelwagon(at)earthlink.
Guest

Posted: Sun Jan 07, 2018 1:17 pm Post subject: Brake air leak

Contact Doug Sap and get rebuild kits for both valves. The valves are located under the floor.  Follow the linkage from the rudder pedals to the distribution valve and the piping to the pressure reducing valve.



Frank



Sent from my iPhone



 	  Quote: 	
		   On Jan 7, 2018, at 12:12, bmsim <bmsim(at)hotmail.com> wrote:

 

 

 

 I had this exact same issue today when I put the parking brake on for preflight. Brake on, hiss under the rear floorboard, brake off, no hiss. I still have brakes on each side, it's just constantly bleeding down while the brake is applied. What did your issue end up being?

 

 I know there's a brake valve, pressure reducer, and distribution valve in there from the schematics, but I'm unsure where they are or what the most likely culprit might be.

 

 Any help or ideas would be very appreciated!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=477157#477157

wlannon(at)shaw.ca
Guest

Posted: Sun Jan 07, 2018 5:52 pm Post subject: Brake air leak

In the CJ the brake pressure reducing valve is located, as Frank noted, 

below the floor.   It is accessed from a two Dzus panel on the bottom of the 

center section left of center.  In fact it is in exactly the same location 

as the brake system water drain (snot) valve which is, of course, checked on 

a regular basis.



Cheers;

Walt



--

wlannon(at)shaw.ca
Guest

Posted: Sun Jan 07, 2018 6:24 pm Post subject: Brake air leak

Forgot to mention that if you find any water here it is way past time to 

service your water filter.



Also;   Had to go to the Forum to find the original post on this subject 

from Dan Booker.  He said it is a CJ and the leak is on the RH side!  That 

is the proportioning valve location though a leak there may be more likely 

to show up with rudder bar movement.

--

bmsim

Joined: 02 Jun 2009
Posts: 32
Location: Alabama

Posted: Mon Jan 08, 2018 8:58 am Post subject: Re: Brake air leak

Thanks everyone for the replies, and that is indeed the area where my hissing is coming from.  I'll check it out and get a rebuild kit!



FYI, this is for a YAK 52.

dsavarese0812(at)bellsout
Guest

Posted: Mon Jan 08, 2018 9:15 am Post subject: Brake air leak

My instructions were for a Yak 52.

Dennis

       From: bmsim <bmsim(at)hotmail.com>

 To: yak-list(at)matronics.com 

 Sent: Monday, January 8, 2018 11:59 AM

 Subject: Re: Brake air leak

--> Yak-List message posted by: "bmsim" <bmsim(at)hotmail.com (bmsim(at)hotmail.com)>

Thanks everyone for the replies, and that is indeed the area where my hissing is coming from.  I'll check it out and get a rebuild kit!

FYI, this is for a YAK 52.

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=477182#477182

http://www.matronics.nbsp;              - MATRONICS WEB FORUMS -http://wiki.matronics.com[/url]

http://www.matron===

bmsim

Joined: 02 Jun 2009
Posts: 32
Location: Alabama

Posted: Mon Jan 08, 2018 9:22 am Post subject: Re: Brake air leak

I figured they were.     As always, thank you Dennis!!

 	  dsavarese0812(at)bellsout wrote: 	
		  My instructions were for a Yak 52.

Dennis



       From: bmsim <bmsim>

 To: yak-list(at)matronics.com 

 Sent: Monday, January 8, 2018 11:59 AM

 Subject: Re: Brake air leak

  

 

--> Yak-List message posted by: "bmsim" <bmsim>



Thanks everyone for the replies, and that is indeed the area where my hissing is coming from.  I'll check it out and get a rebuild kit!



FYI, this is for a YAK 52.



Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=477182#477182



http://www.matronics.nbsp;              - MATRONICS WEB FORUMS -http://wiki.matronics.com[/url]

http://www.matron===

wlannon(at)shaw.ca
Guest

Posted: Mon Jan 08, 2018 9:37 am Post subject: Brake air leak

And my comments were for a CJ since the only info I could find indicated  CJ.  Would be nice to know which aircraft you are trying to diagnose.

  From: A. Dennis Savarese (dsavarese0812(at)bellsouth.net) 

 Sent: Monday, January 08, 2018 9:15 AM

 To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

 Subject: Re: Re: Brake air leak

   My instructions were for a Yak  52.

 Dennis

      From: bmsim  <bmsim(at)hotmail.com>

To:  yak-list(at)matronics.com 

Sent:  Monday, January 8, 2018 11:59 AM

Subject: Re: Brake air  leak

 --> Yak-List message  posted by: "bmsim" <bmsim(at)hotmail.com (bmsim(at)hotmail.com)>

 Thanks everyone for the  replies, and that is indeed the area where my hissing is coming from.  I'll  check it out and get a rebuild kit!

 FYI, this is for a YAK  52.

 Read this topic online here:

 http://forums.matronics.com/viewtopic.php?p=477182#477182

 http://www.matronics.nbsp;              - MATRONICS WEB FORUMS -htt=               - NEW MATRONICS LIST WIiki.matronics.com/"  target="_blank">http://wiki.matronics.com

 http://www.matron===

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dsavarese0812(at)bellsout
Guest

Posted: Mon Jan 08, 2018 11:10 am Post subject: Brake air leak

Totally agree Walt.  When I read "under the floor", I assumed it was a Yak 52 because that is where the brake reducing valve is located in the Yak 52.

Dennis

       From: Walter Lannon <wlannon(at)shaw.ca>

 To: yak-list(at)matronics.com 

 Sent: Monday, January 8, 2018 12:38 PM

 Subject: Re: Re: Brake air leak

   And my comments were for a CJ since the only info I could find indicated CJ.  Would be nice to know which aircraft you are trying to diagnose.

  From: A. Dennis Savarese (dsavarese0812(at)bellsouth.net) 

 Sent: Monday, January 08, 2018 9:15 AM

 To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

 Subject: Re: Re: Brake air leak

   My instructions were for a Yak 52.

 Dennis

      From: bmsim <bmsim(at)hotmail.com>To: yak-list(at)matronics.com Sent: Monday, January 8, 2018 11:59 AMSubject: Re: Brake air leak

 --> Yak-List message posted by: "bmsim" <bmsim(at)hotmail.com (bmsim(at)hotmail.com)>

 Thanks everyone for the replies, and that is indeed the area where my hissing is coming from.  I'll check it out and get a rebuild kit!

 FYI, this is for a YAK 52.

 Read this topic online here:

 http://forums.matronics.com/viewtopic.php?p=477182#477182

  http://www.matronics.nbsp;             - MATRONICS WEB FORUMS -htt=              - NEW MATRONICS LIST WIiki.matronics.com/" target="_blank">http://wiki.matronics.com

  http://www.matron===

 Virus-free. www.avast.com

bmsim

Joined: 02 Jun 2009
Posts: 32
Location: Alabama

Posted: Sat Jan 13, 2018 9:37 am Post subject: Re: Brake air leak

I got the floor panel off and the leak is coming from a port on the valve in the right bottom of Dennis' photo. There's a male threaded port on bottom that does not have an air line attached, and when I apply the parking brake, air continuously comes out that port. 



If the reducing valve is in the top right of the pic, what is this valve? Strange that it blows out that open port. I'm assuming it is there for a reason and doesn't need capped.



Thanks for the help!

dsavarese0812(at)bellsout
Guest

Posted: Sat Jan 13, 2018 1:44 pm Post subject: Brake air leak

Remove the brake reducing valve and either replace it or rebuild it. That should fix your problem. 

Dennis



Sent from my iPhone



 	  Quote: 	
		   On Jan 13, 2018, at 12:37 PM, bmsim <bmsim(at)hotmail.com> wrote:

 

 

 

 I got the floor panel off and the leak is coming from a port on the valve in the right bottom of Dennis' photo. There's a male threaded port on bottom that does not have an air line attached, and when I apply the parking brake, air continuously comes out that port. 

 

 If the reducing valve is in the top right of the pic, what is this valve? Strange that it blows out that open port. I'm assuming it is there for a reason and doesn't need capped.

 

 Thanks for the help!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=477265#477265

bmsim

Joined: 02 Jun 2009
Posts: 32
Location: Alabama

Posted: Sun Jan 14, 2018 6:01 pm Post subject: Re: Brake air leak

Thanks Dennis, so this is the reducing valve?  You had said the reducing valve was in the upper right of your picture, and this is in the lower right, so just confirming before I buy a replacement (noone seems to have kits right now).

 	  dsavarese0812(at)bellsout wrote: 	
		  Remove the brake reducing valve and either replace it or rebuild it. That should fix your problem. 

Dennis



Sent from my iPhone



 	  Quote: 	
		   On Jan 13, 2018, at 12:37 PM, bmsim <bmsim> wrote:

 

 

 

 I got the floor panel off and the leak is coming from a port on the valve in the right bottom of Dennis' photo. There's a male threaded port on bottom that does not have an air line attached, and when I apply the parking brake, air continuously comes out that port. 

 

 If the reducing valve is in the top right of the pic, what is this valve? Strange that it blows out that open port. I'm assuming it is there for a reason and doesn't need capped.

 

 Thanks for the help!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=477265#477265

20180113_112200.jpg

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yakman285(at)gmail.com
Guest

Posted: Mon Jan 15, 2018 3:11 am Post subject: Brake Air leak

Another useful thing to have when troubleshooting is my CJ-6 Air System guide as posted in the RPA Store/Manuals.

Craig Payne

dsavarese0812(at)bellsout
Guest

Posted: Mon Jan 15, 2018 5:41 am Post subject: Brake air leak

Yes, the brake reducing valve is in the upper right of the cut-away drawing I sent you.  The other two components are the brake disabling solendoid (lower right) and the brake differential valve (left side).

When you said "no one seems to have kits right now", I'm assuming you did check with Doug Sapp, the CJ parts supplier?

Dennis



       From: bmsim <bmsim(at)hotmail.com>

 To: yak-list(at)matronics.com 

 Sent: Sunday, January 14, 2018 9:02 PM

 Subject: Re: Brake air leak

  

 

--> Yak-List message posted by: "bmsim" <bmsim(at)hotmail.com (bmsim(at)hotmail.com)>



Thanks Dennis, so this is the reducing valve?  You had said the reducing valve was in the upper right of your picture, and this is in the lower right, so just confirming before I buy a replacement (noone seems to have kits right now).



dsavarese0812(at)bellsout wrote:



 	  Quote: 	
		   Remove the brake reducing valve and either replace it or rebuild it. That should fix your problem. 


	


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		   Dennis


	


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		   Sent from my iPhone


	


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		   >  I got the floor panel off and the leak is coming from a port on the valve in the right bottom of Dennis' photo. There's a male threaded port on bottom that does not have an air line attached, and when I apply the parking brake, air continuously comes out that port. 


	


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		   >  


	


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		   >  If the reducing valve is in the top right of the pic, what is this valve? Strange that it blows out that open port. I'm assuming it is there for a reason and doesn't need capped.


	


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		   >  http://forums.matronics.com/viewtopic.php?p=477265#477265


	


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