whend i puch the brake pedal make a noise like a cow This is your hydro boost unit, it runs with assistance of your power steering pump.Check your power steering fluid level, if it's low then top it ...
...speeds up as the truck speeds up and slows down as the truck slows down. My power brake booster or hydro booster had a bad seal and I thought that was where the sound was coming from but after ...
...FULL COLD level, or middle of hash mark on cap stick fluid level indicator.Important With hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not
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