Thread: Hawk Talk
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Old 10-18-2017, 10:17 AM   #995
JerryHawk250   JerryHawk250 is offline
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Spongy Brakes

I like to pass on some useful information about spongy breaks after replacing the fluid. If the brakes fill spongy after you bleed them you can do the bungee cord trick to removes the tiny air bubbles that get trapped in the system when bleeding the brakes by pumping the lever. The way it works is that after you've bled all you can get, you pump up the brake and tie the lever back by wrapping with a bungee cord that will hold the pressure overnight. The spongy feeling is tiny air bubbles in the fluid that collectively have the space of a much larger amount of air. So when you hit the lever, each little bubble squeeze down a little, but collectively they feel like a big bubble still in there that refuses to bleed out. Tying the lever back under pressure allows those tiny bubbles to float up toward the top and collect together at the inlet to the master cylinder. In the morning, when you release the lever, the first movement of fluid is to rush back to the master and release the brake. However, since the first thing right there is the collected air, it shoots into the master cylinder and simply surfaces to be a harmless air pocket there. Allow a few seconds before pulling the lever to let the bubble get away from the fluid inlet so that only fluid is then pumped into the line. You should now have a good lever feel on the bike.
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