Q: Sweving of front end when braking at highway speed
Diagnosis involved replaceing brakes, calipers, rotors, alignment: finally took to Buick dealer and they supposedly did onboard computer test and result was "brake pressure modulator valve". They will only use new GM parts and would cost ~$2500, much more than cars worth. He gave me all the part info and I took to my garage who obtained the part and installed it. SAME PROBLEM. It seems unlikely that the same problem would exist. Likely bad diagnosis or something else connected to problem.??
My car has 192000 miles.
My car has an automatic transmission.
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