Ford Falcon V8 93model, had the front rotors machined 8 month ago , front end shakes badly and knocks when braking, even a low speed mechanic says rotors are not warped..ball joints are good, tyers are good..change the rotors?
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a good thing to check would be your inner and outer tie rod ends. if they are going bad they will cause a lot of shaking in the car and will also cause the front end to be out of a lined which will make your tires wear faster and uneven
It sounds like you may have more than one problem here. First I would investigate Front End Alignment and ALL Steering/Suspension components for excessive wear and/or looseness. Second I would Inspect the Brake Rotors and Pads for uneven wear. Third I would check the Tires for uneven wear and balance. Many things can cause these symptoms: Worn out Ball Joints, defective Shock Absorbers/Struts. Worn out Tie Rod Ends, Idler Arm, even the Steering Gear Box can be part of the problem. Brake Rotors and Tires can be out of Balance with either one causing the problem over 60 MPH. I strongly suggest having your vehicle inspected by an ASE Certified Front End and Brake specialist immediately. It is very dangerous to drive a vehicle with these symptoms.
The actual disc rotors have warped with heat (eg, driving with foot lightly on brake pedal). Easy fix, take it to a brake shop and get them to true the rotors. In New Zealand, we have guys that come to you to do it but essentially, they use a lathe and trim disc provided it doesn't go below manufacturers specs for thickness.
You need to have the front end inspected for damaged steering components. Check your Tie Rod ends, A frame bushings and ball joints to make sure there isn't excessive wear or lose connections. If all of that is in good working order Drive down the road with a friend in the next lane over and have them look to see if either wheel in bouncing. If either wheel is bouncing you need to replace the struts. they are replaced in pairs, both sides. The front end will need to be aligned after you do this.
Would suggest getting the rotors machined rather than replaced. After the Thickness variation occurs ,then the metal has already taken it's "set" and will stay true longer.
Rotors are cheap now,but go "out of round quickly"