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Hello,
We have experienced "sinking brake pedal syndrome" many times.
The problems is almost always 1 of 2 problems, either a leak or a bad brake master.
In some cases the brake master is the source of a leak.
By the symptoms that were described in this case, I believe it is a bad brake master that is bypassing internally.
With this type of failure, it is not unusual for the brake pedal to feel normal with moderate to heavy pressure applied to the pedal and still fad slowly to the floor when light pressure is applied.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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