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remove the air out of the booster then clamp each wheel to find the area that's at fault. Clamp 1 at a time and try the brake pedal each time.
I've tried everything to improve my spongy pedal but after everything I have done still the same thing. There's 1 more thing on my list but I'll leave that for later down the track anyway let me know when you're going to bleed the fluid and we'll smash it out in 10 mins. Ask Darren how fast and how well we bled his gq