Re: Spongy Brakes
If the brakes are spongy there is air in the system somewhere, brake fluid does not compress. The residual valve(s) are to maintain pressure in the wheel cylinders. There are a number of sites online that go into great detail on how brake systems work.
On your immediate problem, how are you bleeding the brakes? Have they been pressure bleed? A very small amount of air can cause a lot of problems.
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