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Brake Fluid Out Top Of Reservoir

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schmoboy

Joined: 26 Feb 2006
Posts: 130

Posted: Mon Jun 09, 2014 2:43 pm Post subject: Brake Fluid Out Top Of Reservoir

Did a few taxi test runs today before first flight hopefully this Saturday.



When I got her back in the hangar I noticed brake fluid on the belly.  

Taking off the top cowl I noticed that brake fluid was coming out the 

top of the reservoir vent cap.  I assume that I had it too full?



So, how full is full enough where applying the brakes no longer allows 

it to seep out the top of the reservoir?



Thanks,



-Sean #40303 (Prepping for first flight)

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flying-nut(at)cfl.rr.com
Guest

Posted: Mon Jun 09, 2014 3:02 pm Post subject: Brake Fluid Out Top Of Reservoir

I think you still had some air trapped in the system somewhere that 

forced some fluid back to the reservoir.  The expansion was probably due 

to the air being heated ..... probably near the brake piston.

It only takes a small bit of oil to look like you lost a gallon ......

I'd bleed the brakes again .... from the bottom.  I have a PVC pipe 

capped on one end and the other with a female adapter.  A plug with a 

small hole in the end allows you to fill the pipe, put the plug in and 

put some shop air through the hole.  Doesn't take much pressure.

Plastic tubing pushed into an undersized hole near the cap on the bottom 

feeds the fluid to a fitting screwed into the brake cylinder in place of 

the 'pressure relief' fitting.

A barb fitting screwed into the reservoir allows you to capture the 

'overflow' and run it into a clean container so you can re-use it.  Wait 

'till all the bubbles in the line are gone ..... at that point you 

should have a 'full' brake system .... at least on that side. 

Linn



On 6/9/2014 6:42 PM, Sean Stephens wrote:

 	  Quote: 	
		   



 Did a few taxi test runs today before first flight hopefully this 

 Saturday.



 When I got her back in the hangar I noticed brake fluid on the belly.  

 Taking off the top cowl I noticed that brake fluid was coming out the 

 top of the reservoir vent cap.  I assume that I had it too full?



 So, how full is full enough where applying the brakes no longer allows 

 it to seep out the top of the reservoir?



 Thanks,



 -Sean #40303 (Prepping for first flight)

 -----

 No virus found in this message.

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napolin(at)me.com
Guest

Posted: Tue Jun 10, 2014 5:28 am Post subject: Brake Fluid Out Top Of Reservoir

I would remove just a tad from where it is right now so you dont get any more overflow.



Niko



Nikolaos Napoli



 	  Quote: 	
		   On Jun 9, 2014, at 6:42 PM, Sean Stephens <sean(at)stephensville.com> wrote:

 

 

 

 Did a few taxi test runs today before first flight hopefully this Saturday.

 

 When I got her back in the hangar I noticed brake fluid on the belly.  Taking off the top cowl I noticed that brake fluid was coming out the top of the reservoir vent cap.  I assume that I had it too full?

 

 So, how full is full enough where applying the brakes no longer allows it to seep out the top of the reservoir?

 

 Thanks,

 

 -Sean #40303 (Prepping for first flight)

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karolamy(at)roadrunner.co
Guest

Posted: Tue Jun 10, 2014 7:46 am Post subject: Brake Fluid Out Top Of Reservoir

On Jun 10, 2014, at 12:02 AM, RV10-List Digest Server <rv10-list(at)matronics.com (rv10-list(at)matronics.com)> wrote:

 	  Quote: 	
		  Brake Fluid Out Top Of Reservoir 	




Sean,

I don’t think you ever got an answer as to brake fluid level in Master Cylinder.  The cylinder does need to have room for expansion of the fluid as it heats up on braking and so about 3/4 is a good  working  level for me in past RV’s.  I put a mark on the outside of the cylinder about 3/4 of the way up from the bottom.  Take the cap off.  Put a finger on the mark on the outside and look in the cylinder matching the fluid level with your finger on the outside.  Of course, use a flashlight if needed.   If it is too high, syphon a bit out of the M/C with a small hose.   

That said, I also agree that you should bleed the system (both sides) again to make sure you have removed all air from the lines.  I like to screw a fitting (something like ACS part # AN840-4D -$4.45)  into the M/C top.  Then push on several feet of some tight fitting clear tubing so you can see what comes out. Put the other end of the tubing into a container, then go back down to the calipers and bleed away.  Remember we are trying to force the fluid into the calipers through the lines and up into the master cylinder.  If you are using Vans stock brake lines you can at least see if there is air in the transfer tubes, so carefully check these.  Hope that helps…..  

Rich



 [quote][b]

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schmoboy

Joined: 26 Feb 2006
Posts: 130

Posted: Tue Jun 10, 2014 9:47 am Post subject: Brake Fluid Out Top Of Reservoir

Thanks guys.  I'll lower the level a bit in the reservoir and see how it 

goes.



I've used the bottom up bleeding method recommended and the brakes were 

good.  No soft spots noticed on a few taxi runs.



 	  Quote: 	
		   Karol Hansen <mailto:karolamy(at)roadrunner.com>

 June 10, 2014 at 10:45 AM



 Sean,

 I don’t think you ever got an answer as to brake fluid level in Master 

 Cylinder.  The cylinder does need to have room for expansion of the 

 fluid as it heats up on braking and so about 3/4 is a good  working 

  level for me in past RV’s.  I put a mark on the outside of the 

 cylinder about 3/4 of the way up from the bottom.  Take the cap off. 

  Put a finger on the mark on the outside and look in the cylinder 

 matching the fluid level with your finger on the outside.  Of course, 

 use a flashlight if needed.   If it is too high, syphon a bit out of 

 the M/C with a small hose.



 That said, I also agree that you should bleed the system (both sides) 

 again to make sure you have removed all air from the lines.  I like to 

 screw a fitting (something like ACS part # AN840-4D -$4.45)  into the 

 M/C top.  Then push on several feet of some tight fitting clear tubing 

 so you can see what comes out. Put the other end of the tubing into a 

 container, then go back down to the calipers and bleed away.  Remember 

 we are trying to force the fluid into the calipers through the lines 

 and up into the master cylinder.  If you are using Vans stock brake 

 lines you can at least see if there is air in the transfer tubes, so 

 carefully check these.  Hope that helps…..



 Rich



 *

 *

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