The trouble is that Google tells me there are loads of things it could be - from air still in the system, to a master cylinder that needs replacing, to a split vacuum line. It just seems odd that if I push the pedal a second time, it's firm like it should be, but a few seconds later I'll have to pump it again to get it hard (that's what she said).
My brakes do this by the way and they’re fine, second pump is always harder (oi oi) I got rid of all the brake vacuum stuff though so i thought I’d experience that more now I have no vacuum to help the brakes. Still fine though, aside from them behind pretty pathetic to start with in terms of braking power lol
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