I replaced my calipers, bearings, rotors, pads and soft lines recently. After getting the car on the road, I noticed the steering wheel twitches back and forth as I slow down. I've never had this happen, what would cause this?
Did you get any grease on the rotors? Sometimes they have a coating on them from the parts store that needs to be cleaned off also.
Or may be those Chinese rotors I've replaced rotors for people that bought the cheapest Chinese ones and they were worse then the ones that were on the car..
This condition can be caused by a few things. First and foremost is a "Warped" rotor. This implies that there are inconsistencies in the thickness of the rotor face from one spot on the rotor to another. This is the major cause, even new rotors can have this problem. Most are either made in China or Brazil now days. I have seen as much as a .010 difference in thickness measured from one spot on the rotor to another. Just because it is new doesn't mean it is perfect. The only way to really find this out is to check the run out on the rotors. If you have a dial indicator this is a rather easy thing to do, if not take them and have them re-surfaced. The second cause is not cleaning the rotors after install and before brake pad installation. All rotors will have a film of cosmaline on them to keep them from rusting during shipment and storage. Additionally, during installation you can get grease and dirt on them. If you have not got the rotors clean prior to pad install it will transfer to the pads, collect dust and will cause a "sticky" spot on the rotor. If this is the case you will need to get some good brake cleaner take the brakes back apart to clean the rotors, spray down the pads, put a piece of 120 grit sand paper on a flat surface, sand down the face of the pad to remove the contaminant, spray off the pads again to remove all the dust, let them dry and re-install making sure all is clean. If that doesn't fix the problem just post back here and we can go into a few more things that will cause this condition. Hope this helps.
