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Could possibly be a fault with your servo. With engine off and stationary pump pedal 3 to 4 times. If pedal then stays firm suspect servo and piping if peda still sinks after a brief time I agree with Tech.
Another check of servo operation is to pump 3 to 4 times (stationary/eng off) hold foot on pedal and start engine, if pedal sinks slightly servo seems ok, if sinks a lot servo prob us.
Check the one way valve in the servo first, very cheep to replace.
Hope this helps
 
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