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Mixing Brake Fluids

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dmaib@me.com

Joined: 25 Apr 2006
Posts: 455
Location: New Smyrna Beach, Florida

Posted: Fri Dec 03, 2010 5:52 am Post subject: Mixing Brake Fluids

Is there any problem adding Royco 782 to my brake system that currently has 5606 in it?

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_________________
David Maib
RV-10 #40559
New Smyrna Beach, FL

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Fri Dec 03, 2010 6:40 am Post subject: Mixing Brake Fluids

I can't tell you the answer since I don't know for sure, but,

I found it really easy to drain out the old, and just pump in

the new when I did it.

http://www.myrv10.com/N104CD/upgrades/20100328/index.html

One other thing I did previously was replace the puck o-rings

with ones that handle higher temps:



http://www.myrv10.com/N104CD/maintenance/20080503/index.html



So those would be 2 good things to do at the same time to

avoid the headache of bleeding them twice.

Tim Olson - RV-10 N104CD

do not archive

On 12/3/2010 7:52 AM, dmaib(at)me.com wrote:

 	  Quote: 	
		   



 Is there any problem adding Royco 782 to my brake system that currently has 5606 in it?



 --------

 David Maib

 RV-10 #40559





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=322154#322154

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Neal.George(at)hurlburt.a
Guest

Posted: Fri Dec 03, 2010 7:24 am Post subject: Mixing Brake Fluids

David - 



Royco 782 is formulated to meet MIL-PRF-83282, and is compatible with fluids

that meet MIL-5606.

  

Tim offers sound advise.  Changing the O-rings to Viton and flushing the

system with fresh 83282 will increase your hot-brake and flash-point

margins.



Neal   



==============

Is there any problem adding Royco 782 to my brake system that currently has

5606 in it?



--------

David Maib

RV-10 #40559

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rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Fri Dec 03, 2010 7:46 am Post subject: Re: Mixing Brake Fluids

Neal,



Do we need to swap the o-rings prior to installing 83282?  Or is that only because 5606 was previously used?



thanks,



bob

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Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Fri Dec 03, 2010 8:04 am Post subject: Mixing Brake Fluids

They're just better, higher temp o-rings.  You can swap them

anytime. Ideally you'll do it before first taxi, because there

have already been near brake fires from people fast taxi-ing.

Ideally you'll start with the good fluid initially, too.



I did the o-ring swap after another RV-10 builder showed me

that his brakes and wheels heated up enough to actually

melt his tires during a fast taxi experience....only took

a couple minutes, and there was smoke pouring from his wheels.

So he ordered o-rings that were Viton and sent me a couple

to install.   Then later, I changed out my fluid as well.

Either fluid is compatible with either o-ring...you're

just changing to better of both.



Also, I do know at least one builder who used DOT5 (?) fluid

and they did NOT have good luck with compatibility of the

o-rings (not sure which type)....so if by some chance you're

going down that road, you really should plan to look at the

entire system to make sure everything is compatible with

DOT5....but I recommend just going to the 83282 fluid

that is made for aircraft use.



Tim Olson - RV-10 N104CD

do not archive

On 12/3/2010 9:46 AM, rleffler wrote:

 	  Quote: 	
		   



 Neal,



 Do we need to swap the o-rings prior to installing 83282?  Or is that only because 5606 was previously used?



 thanks,



 bob



 --------

 Bob Leffler

 N410BL - Finish

 RV-10 #40684

 http://mykitlog.com/rleffler





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=322170#322170

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Neal.George(at)hurlburt.a
Guest

Posted: Fri Dec 03, 2010 8:08 am Post subject: Mixing Brake Fluids

The Buna O-rings that came on the pucks are compatible with the MIL-83282,

but Viton has higher temp limits - like 425*F (Viton) vs 285*F (Buna) if

memory serves. 



neal



--

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rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Fri Dec 03, 2010 10:04 am Post subject: Re: Mixing Brake Fluids

Tim, Neal,



Thanks for the information!



bob

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Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

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