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Sounds like a good diagnosis unless you are NOT talking about the brake rotors fluttering as you come to a stop. But, if you are sitting at a stop sign and feel the pulsing, then you may be right about the Hydroboost.
 

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Are you feeling the pulsing when you are rolling or stopped?

If the pulsing is when you are rolling, it could be rotors. A sticking caliper piston could be causing the rotor to warp due to excessive heat build-up. The piston could also be causing the pad to be sticking out on the rotor until you roll it forward and the rotor's warp forces the piston back in.
 

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If the pedal is pulsing when you are at a dead stop, then it is not the rotors you are feeling. Of course, there could be two separate problems going on. But if the wheels are not Turing, it is not the rotors. No visible fluid leaks?
 
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