Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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it sounds like the rotors are out of round and that will cause the pedal to move up and down during application
could be plugs, wires, cap or rotor. check basics first
first verify the reading with a manual gauge. the sender are common for sending false signals. verify the actual pressure. the oil may be burning from worn piston rings or valve seals.
how are you making out