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Re: Stiff brake pedal which ratchets to floor
I believe your diesel Suburban has hydro-boost for brake assist instead of vacuum assist. If so, the brake pedal is assisted with hydraulic pressure from the power steering pump. When you say it happens at low speeds only, that's when your engine (and power steering pump) are spinning the slowest. If the pump. or associated system, has a pressure issue, that could be the problem. Does it happen at idle?
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