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If the pedal feels soft and spongy, you have air trapped in your brake lines. Did you prime the master cylinder before you installed it? Air in the brake line will not let the fluid fully compress. With all that you changed out, your brakes shoudl feel like new. Read up on how to bleed brakes or take it to a pro.......but don't continue to drive it the way it is.

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Q: I replaced rear brakes front brakes master cylinder vacuum booster and still have Excessive brake peddle travel in 1990 GMC Sierra 1500?
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