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Tri-gear Jamar brakes

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Oct 12, 2009 10:52 am Post subject: Tri-gear Jamar brakes

Hi! Frans

I'm not familiar with the JAMAR term you use. I have trike foot brakes not

finger brakes. However I forced fluid up from the bottom using a lemonade

bottle linked to the nipple (You will be using a large vets SYRINGE)

However, have you realized that the bleed nipple at the brake end needs to

be on the bottom of the slave cylinder and the pipe connection to the master

cylinders need to be on the top?

Regards

Bob Harrison G-PTAG



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frans(at)paardnatuurlijk.
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Posted: Mon Oct 12, 2009 11:52 am Post subject: Tri-gear Jamar brakes

Robert C Harrison wrote:

 	  Quote: 	
		   


	


Hi Robert,



 	  Quote: 	
		   However, have you realized that the bleed nipple at the brake end needs to

 be on the bottom of the slave cylinder and the pipe connection to the master

 cylinders need to be on the top?


	


Why would that be?



According to the manual, the bleed nipple should point forward (which

happens to be the upper connector). I felt no suspicion doing it that

way, because air tends to rise, so it seemed logical to have the bleed

nipple on top, that way any air in the caliper will collect near the

bleed nipple. Apart from that, the brake line will then nicely follow

the leg so the brake line won't dangle into the air.



Maybe you are right that it should be the other way around, but could

you please also explain why?



Frans

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Oct 12, 2009 12:41 pm Post subject: Tri-gear Jamar brakes

Hi! Frans.

If you are filling oil from the bottom,(that is with the bleed (filling)

nipple at the bottom, as you say air rises so there will not be a pocket of

it in the slave cylinder top, you will expel all the air out of the master

cylinder. If the bleed nipple is at the top of the slave cylinder and you

are trying to expel air downwards and back to the master cylinder it won't

oblige! 

You are actually NOT using it as a "bleed" nipple in this application you

are using it as a filling nipple to expel the air upwards and to the master

cylinder.

Hope you understand? Exasperating isn't it ?

Regards

Bob Harrison G-PTAG



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kheindl(at)msn.com
Guest

Posted: Mon Oct 12, 2009 1:26 pm Post subject: Tri-gear Jamar brakes

  

Frans C

  

 look at any Cessna etc. C you will find the 'bleed'nipple at the bottom.

  

 Karl

 



  

[quote] From: ptag.dev(at)tiscali.co.uk

 To: europa-list(at)matronics.com

 Subject: RE: Tri-gear Jamar brakes

 Date: Mon C 12 Oct 2009 21:40:42 +0100

 

 --> Europa-List message posted by: "Robert C Harrison" <ptag.dev(at)tiscali.co.uk>

 

 Hi! Frans.

 If you are filling oil from the bottom C(that is with the bleed (filling)

 nipple at the bottom C as you say air rises so there will not be a pocket of

 it in the slave cylinder top C you will expel all the air out of the master

 cylinder. If the bleed nipple is at the top of the slave cylinder and you

 are trying to expel air downwards and back to the master cylinder it won't

 oblige! 

 You are actually NOT using it as a "bleed" nipple in this application you

 are using it as a filling nipple to expel the air upwards and to the master

 cylinder.

 Hope you understand? Exasperating isn't it ?

 Regards

 Bob Harrison G-PTAG

 

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frans(at)paardnatuurlijk.
Guest

Posted: Mon Oct 12, 2009 1:35 pm Post subject: Tri-gear Jamar brakes

Robert C Harrison wrote:



 	  Quote: 	
		   Hi! Frans. If you are filling oil from the bottom,(that is with the

 bleed (filling) nipple at the bottom, as you say air rises so there

 will not be a pocket of it in the slave cylinder top, you will expel

 all the air out of the master cylinder. If the bleed nipple is at the

 top of the slave cylinder and you are trying to expel air downwards

 and back to the master cylinder it won't oblige! You are actually NOT

 using it as a "bleed" nipple in this application you are using it as

 a filling nipple to expel the air upwards and to the master cylinder.


	


Ok, got that. But I never intended to bleed it this way, but just

"normally" like with cars: top up the reservoir, push the brake and open

the nipple, close it, release brake, and repeat until the air is gone.

Actually, this is still what I intend to do after I initially filled the

system from the bottom up.



If the system is bleed entirely by pumping in fluid from the bottum up,

then your configuration makes more sense. Although it will be difficult

to route the brake line. If you route it down to the leg and then

upwards, then again there is a pocket where air can collect. The only

solution is then to route it upwards directly from the caliper, which is

a problem if you have the leg fairings installed.



Frans

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rparigor(at)suffolk.lib.n
Guest

Posted: Mon Oct 12, 2009 1:43 pm Post subject: Tri-gear Jamar brakes

For what it's worth:



"look at any Cessna etc., you will find the 'bleed'nipple at the bottom.:



I owned a 1948 Cessna 170 that had Clevland brakes with bleed screw on bottom. 



Always a bugger to bleed. Filling from bleed up helped, but also would help early on if would loosen connection going into wheel cylinder, let air out bottom up, and use that connection as a bleed from top down using wheel cylinder to pressurize and close connection before releasing pedal.



1948 had a different master cylinder compared to newer ones.



Just a friendly reminder, don't let Dot 5 brake fluid out of it's container anywhere near your aeroplane or shop if you need to do any layups, fill or paint. "IT IS SILICONE"!



Ron Parigoris

Visit -  www.EuropaOwners.org

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Oct 12, 2009 1:55 pm Post subject: Tri-gear Jamar brakes

Frans your plan is depending on having an adequate reservoir.

How will you change the pipe connector and nipple over without the ingress

of air? On mine there is no reservoir. Once filled from bottom up and all

air is gone I just fill the master cylinders to the top of the plug threads

and slowly screw in the plug to allow the excess to squeeze out of the

threads with rags packed round to soak up any spillage.

But don't let me confuse you .....mine are not finger brakes and not Jamar !

Regards

Bob. 



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