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Synthetic brake fluid and Viton O-rings

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ronlee(at)pcisys.net
Guest

Posted: Wed Dec 26, 2007 2:18 pm Post subject: Synthetic brake fluid and Viton O-rings

I plan on changing out to the higher temp  synthetic transmission fluid

 discussed here (Mobil 1 Synthetic ATF) and in addition will change 

 over to the Viton O-rings

  

 The following website has the o-ring listed:

  

 http://www.romeolima.com/RV3hq/Maintenance/maintenance.html

  

 "Standard MS replacement for the caliper o-rings is MS28775-218. 

 The Viton O-ring upgrade is 2-218V-75 "

  

 I can't state which brake assembly this is for  other than it may be the

 typical Vans brake.

  

 What other O-rings might be needed for the master cylinders (?) is

 unknown.

  

 Ron Lee

  

  

  

    [quote][b]

Dennis Glaeser

Joined: 10 Jan 2006
Posts: 53
Location: Rochester Hills, Michigan

Posted: Wed Dec 26, 2007 3:17 pm Post subject: Synthetic brake fluid and Viton O-rings

I'm using DOT 4 brake fluid - which is glycol based and therefore does not

burn.  On Doug Reeve's VAF site, do a search for DOT 4 Brake Fluid.  I

bought a seal kit from an RV'er named Charlie Kuss which had all the EPDM

O-rings for the brake caliper, brake cylinders, and even the Matco parking

brake if you need it.  I don't know if he still has kits, but he would have

all the sizes needed.



After seeing the brake line failure fire that Ed Anderson posted recently,

I'm glad I went with the DOT 4 fluid.



Dennis Glaeser



--------------------------------------------------------------------------

From:      Ron Lee (ronlee(at)pcisys.net)

Date:      Wed Dec 26 - 2:18 PM



I plan on changing out to the higher temp synthetic transmission fluid

discussed here (Mobil 1 Synthetic ATF) and in addition will change

over to the Viton O-rings



The following website has the o-ring listed:



http://www.romeolima.com/RV3hq/Maintenance/maintenance.html



"Standard MS replacement for the caliper o-rings is MS28775-218.

The Viton O-ring upgrade is 2-218V-75 "



I can't state which brake assembly this is for other than it may be the

typical Vans brake.



What other O-rings might be needed for the master cylinders (?) is

unknown.



Ron Lee

klwerner(at)comcast.net
Guest

Posted: Wed Dec 26, 2007 5:32 pm Post subject: Synthetic brake fluid and Viton O-rings

Hi Dennis,

 Doesn't glycol absorb moisture from  the atmosphere in high humidity areas?

 Wouldn't it have been easier to get  the newer/higher flashpoint fluid instead of changing all these  seals? 

 Give my greetings to the  Kids...,  and I guess now we won't see you here in ABQ  again.

 Konrad

  

 do not archive

  

 [quote]   ---

ronlee(at)pcisys.net
Guest

Posted: Wed Dec 26, 2007 5:46 pm Post subject: Synthetic brake fluid and Viton O-rings

 	  Quote: 	
		   After seeing the brake line failure fire that Ed Anderson posted recently,

 I'm glad I went with the DOT 4 fluid.


	


That thread on DOT fluid just made this more confusing.  It seems that 

DOT Brake fluid is not good in aircraft brake systems.



Ron Lee

acepilot(at)bloomer.net
Guest

Posted: Wed Dec 26, 2007 5:56 pm Post subject: Synthetic brake fluid and Viton O-rings

I was always under the impression that 5606 hydraulic was the way to 

go.  I thought DOT was corrosive to aluminum???  Might be FOS (full of 

sh**) on this one, but I do seem to recall 5606 was the way to go

Scott

http://corbenflyer.tripod.com/

Gotta Fly or Gonna Die

Building RV-4 (Super Slow Build Version)

Ron Lee wrote:

 	  Quote: 	

> After seeing the brake line failure fire that Ed Anderson posted 

> recently,

> I'm glad I went with the DOT 4 fluid.

 That thread on DOT fluid just made this more confusing.  It seems that 

 DOT Brake fluid is not good in aircraft brake systems.

 Ron Lee

khorton01(at)rogers.com
Guest

Posted: Wed Dec 26, 2007 6:05 pm Post subject: Synthetic brake fluid and Viton O-rings

The viton seals apparently will withstand much higher temperatures  

than the original seals, so they might be a good thing even if the  

brake fluid you use didn't need them.  If you ever get the brakes  

really hot, and the O-ring in the caliper let go, you would lose the  

brake on that side.  That might lead to an accident even if the brake  

fluid didn't catch on fire.



Kevin Horton



On 26-Dec-07, at 20:31 , Konrad L. Werner wrote:



[quote] Hi Dennis,

 Doesn't glycol absorb moisture from the atmosphere in high humidity  

 areas?

 Wouldn't it have been easier to get the newer/higher flashpoint  

 fluid instead of changing all these seals?

 Give my greetings to the Kids...,  and I guess now we won't see you  

 here in ABQ again.

 Konrad



 do not archive



 ---

Dennis Glaeser

Joined: 10 Jan 2006
Posts: 53
Location: Rochester Hills, Michigan

Posted: Fri Dec 28, 2007 7:49 am Post subject: Synthetic brake fluid and Viton O-rings

Hi Konrad,



The glycol does absorb water - but that is considered good because then the

water doesn't separate out and then corrode the stuff at the low points in

the system.  There was a big discussion about this a while back (I found it

by searching).  Changing the seals was pretty easy.  I guess I like the idea

of no flashpoint best of all 



We will like having the kids closer (1.5hrs by RV!)  Depending on when they

actually leave, and when I get mine flying, I may get a chance to make a

trip out west.  We'll see.



Dennis



----------------------------------------------------------------------------

------------------

Hi Dennis,

Doesn't glycol absorb moisture from the atmosphere in high humidity

areas?

Wouldn't it have been easier to get the newer/higher flashpoint fluid

instead of changing all these seals?

Give my greetings to the Kids...,  and I guess now we won't see you here

in ABQ again.

Konrad



do not archive

klwerner(at)comcast.net
Guest

Posted: Fri Dec 28, 2007 8:30 am Post subject: Synthetic brake fluid and Viton O-rings

Dennis,

 Wouldn't it be better if any  brake fluid does not attract (and absorb) any potential water in the first  place?  

 Wouldn't the commercial and military  guys adopt automotive Dot-X, if it were the better way to go? Just  curious...

  

 One cause in regards to brake  fires could be the rather tight wheel pants which restrict  the dissipation of heat from the brake rotors.

 I think the newer brakefluid with  it's higher boiling point is sufficient (as designed), if one does not "ride"  the brakes all the time...

  

 Other then that, I don't know much  about the other intricacies between car and airplane brake systems and  their potential pro's and con's?

 Cheers,

 Konrad

  

 do not archive

 [quote]   ---

matronics(at)cencula.com
Guest

Posted: Sun Dec 30, 2007 10:30 pm Post subject: Synthetic brake fluid and Viton O-rings

For a *very* thorough writeup of DOT brake fluid and it's corrosive 

properties, please reference a NIST document:



http://www.brakestrips.net/docs/nistir6233_absrpt.pdf



The short answer seems to be that plain DOT fluid exceeds the corrosion 

resistance spec for aluminum by a factor of 10.



Additionally, all automotive ABS modules that I'm aware of are made from 

aluminum which would further indicate that there's no problem with DOT 

brake fluid and aluminum compatibility.



Mike Cencula

RV-7A fuse



Scott wrote:

 	  Quote: 	
		   



 I was always under the impression that 5606 hydraulic was the way to 

 go.  I thought DOT was corrosive to aluminum???  Might be FOS (full of 

 sh**) on this one, but I do seem to recall 5606 was the way to go

rv9jim(at)juno.com
Guest

Posted: Tue Jan 01, 2008 1:32 pm Post subject: Synthetic brake fluid and Viton O-rings

Hi Ron,

        You only need to replace the O-Rings in the calipers as that is

where the heat is generated.  The rings on the inside of the aircraft are

fine as they stand. 





Jim Nelson

Changing fluid and O-Rings

ronlee(at)pcisys.net
Guest

Posted: Tue Jan 01, 2008 5:00 pm Post subject: Synthetic brake fluid and Viton O-rings

Thanks Jim,  I was thinking that was the case.  I have one set of O-rings 

for the Cleveland master cylinders so I need to get another set for the

passenger brakes.   That and the Viton O-rings plus some Mobil 1

synthetic ATF fluid and I can redo my brake system later this month.



Ron Lee



 	  Quote: 	
		   Hi Ron,

        You only need to replace the O-Rings in the calipers as that is

 where the heat is generated.  The rings on the inside of the aircraft are

 fine as they stand. 




	


 	  Quote: 	
		   Jim Nelson

 Changing fluid and O-Rings

jimmy(at)jhill.biz
Guest

Posted: Mon Jan 07, 2008 1:06 pm Post subject: Synthetic brake fluid and Viton O-rings

So I don't have to remove wheel pants to get brake ser. no., could someone 

tell me the correct part number and supply source for the Viton 75 O-rings? 

Can then have them on hand and ready.  (RV8A)



Thanks.



Jimmy



do not archive

---

ronlee(at)pcisys.net
Guest

Posted: Mon Jan 07, 2008 5:55 pm Post subject: Synthetic brake fluid and Viton O-rings

The following website has the o-ring listed:



http://www.romeolima.com/RV3hq/Maintenance/maintenance.html



"Standard MS replacement for the caliper o-rings is MS28775-218.

The Viton O-ring upgrade is 2-218V-75 "



---

randy(at)romeolima.com
Guest

Posted: Mon Jan 07, 2008 6:44 pm Post subject: Synthetic brake fluid and Viton O-rings

Here ya go...

http://www.romeolima.com/RV3hq/Maintenance/maintenance.html#BrakeFluid



Randy Lervold

---

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