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Sounds like you got air in the lines so you would have to bleed the brakes. Just saying that they suck doesn't explain much so I went for the bleed the brakes but if it was explained just what is going on with them maybe then it could be pin pointed.

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Q: Your 1993 mark vIII brakes suck you have replaced the pads and the lines are good is it the master cylinder or a vacuum leak?
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