Just bought a 1972 Citabria 7GCBC.

something along these lines
 
Spruce sells this, but the price is absurd. Dunno if that style pump is less susceptible to bubbles or something. My A&P loaned me one the first time I did my brakes. No bubbles but pumped REALLY slowly. After that I grabbed an oil can from Ace Hardware.

 
They don't make good pumps any more. You are looking for an all-metal can with a non-flimsy pump and lever. Balkamp, among others, made tons of them. No more; they are plastic and the pump lever will bend.

That syringe won't hold nearly enough fluid.
 
I personally haven’t used this small one but one guy on the field talked my ear off about it. We use a lot bigger setup. Modified the second link with a ball valve and such. Only way to get enough flow for the notorious air tractor brakes.

 
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Finally came up with a good tool for bleeding brakes. I copied the popular one made by Aircraft Tool Supply (not in stock anywhere with a long backorder date). The main component is an "automotive" pressure bleeder tank procured from Amazon that is modified to work with my Cleveland brakes. Works great with no bubbles and plenty of volume.

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Hi folks, just took my plane off skis. Trying to bleed my brakes. Where exactly is the overflow tube? ‘73 GCBC
 

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'75 GCBC. My overflow tube is a metal tube that comes out of the reservoir on the pilot's side of the firewall. The tube goes down to the bottom of the fuselage under the floor and exits at the back of the lower boot cowl. Putting a substantial rag under it saves a mess on the floor when bleeding.
 
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