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  #1  
Old 02-26-2023, 04:00 PM
cjjohns79 cjjohns79 is offline
 
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Location: Edmond, OK
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Default Cleveland brake system

I recently bought an RV-8 so please excuse my lack of knowledge. I thought I would get some knowledge from you folks before going any further. I put new o-rings in both calipers and will soon be refilling the brake fluid. I plan to push the fluid up from the bottom but am unsure of what to do at the master cylinder to know when it is full. Can anyone assist? Do I have to do anything at the master cylinder before pumping fluid?
Thanks!
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  #2  
Old 02-26-2023, 04:08 PM
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Carl Froehlich Carl Froehlich is online now
 
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Take off the cap on the brake reservoir. Attach a 1/8 pipe fitting nipple where the cap goes. Attach a clear plastic tube to the other end of the nipple and then direct the tube into a collection bottle. Pump up one side until you see new fluid at the master cylinder exit line to the brake reservoir. Stop pumping when you know the fluid is going into the reservoir. The last step is to pump up the other cylinder until you get fluid coming out of the reservoir.

Carl
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Old 02-26-2023, 04:26 PM
chaskuss chaskuss is offline
 
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Good advice by Carl. I generally keep pumping fluid in until I see the fluid come out that overflow line without any air bubbles in it. That way, you are sure there is no air in the system.
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Old 02-26-2023, 06:03 PM
cjjohns79 cjjohns79 is offline
 
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Thank you both! Is there a separate reservoir for each side or do they flow into a common fluid reservoir? I thought the fluid was contained to each MC.
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  #5  
Old 02-26-2023, 06:15 PM
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D Weisgerber D Weisgerber is offline
 
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There should be a reservoir container on the firewall. I used the standard vans reservoir which is aluminum with a cap on it the I believe takes a 7/16 wrench to remove.
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  #6  
Old 02-26-2023, 06:47 PM
Mile High Relic Mile High Relic is offline
 
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Quote:
Originally Posted by cjjohns79 View Post
Thank you both! Is there a separate reservoir for each side or do they flow into a common fluid reservoir? I thought the fluid was contained to each MC.
There is a common reservoir with a T fitting. On my 6, the reservoir is mounted on the engine side of the firewall and the T fitting screws into it (NPT) from the cockpit side.

I'm in the process of replacing the fitting and lines, but the picture shows the old T fitting.
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  #7  
Old 02-26-2023, 08:22 PM
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koupster koupster is offline
 
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Quote:
Originally Posted by Carl Froehlich View Post
Take off the cap on the brake reservoir. Attach a 1/8 pipe fitting nipple where the cap goes. Attach a clear plastic tube to the other end of the nipple and then direct the tube into a collection bottle.
Carl
A small refinement to Carl's post. Install a small length (around 3/4") of tubing into the pipe threaded end of the fitting. Now the reservoir will "overflow" when it's at the proper level with a bit of expansion space for the fluid. Adjust the short length of tubing to your preference.
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  #8  
Old 02-26-2023, 08:43 PM
Majorpayne317641 Majorpayne317641 is offline
 
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I use a mity vac vacuum that uses an air compressor for suction, they work great for any brake lines but I found it works very well for aircraft too.
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  #9  
Old 02-26-2023, 09:27 PM
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RV8JD RV8JD is offline
 
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Quote:
Originally Posted by cjjohns79 View Post
Is there a separate reservoir for each side or do they flow into a common fluid reservoir? I thought the fluid was contained to each MC.
Below is the RV-8 brake system drawing that may help.

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BTW, you should purchase a set of plans on a USB flash drive for $10 from Van's:
https://store.vansaircraft.com/rv-8-...s-rv-8-8a.html
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Last edited by RV8JD : 02-26-2023 at 09:46 PM.
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  #10  
Old 02-27-2023, 06:48 PM
cjjohns79 cjjohns79 is offline
 
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Thank you!!
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