Got vibration through the break peddle in my focus st when breaking at high speeds , had the discs skimmed and new pads all round also had new tyre's all round and its still vibrating, can't think of...
Hello, I have a few ideas about your problem. The tie rod ends keep the front wheels parallel to each other and they must be tight to maintain front-end alignment. If you previously had square rotors in the front, the tie rod ends had a work out and may have loosened up. If you decide to replace the ends and do not want to get an alignment, then try replacing each end like this:
If you can put the wheels on portable ramps or blocks of wood, keep the weight of the vehicle on the tires. Mark the rod with paint, scribe the rod with a hacksaw, or put a piece of wire on the thread side of the rod to mark the tie rod ends' position. Take one side of the tie-rod and drop the end out of the wheel fixture and then unscrew the end while counting turns. Replace with a new part and turn in the same amount of turns. The new end should be close to the mark for the old end where you previously marked the rod. The accuracy comes in when you go to attach the tie rod end into the wheel fixture. The tie rod end should line up exactly with the wheel fixture and then draw straight up into the housing when you tighten the tapered end of the new tie rod into place. By having the weight of the car on the tires, you should minimize the slack between the 2 wheels.
Just remember that you may have slack in both ends and there is a tendency to make all of the adjustment on the first side you do. This would throw the front-end alignment off.
The next step is to check drive-train vibration. If you have an Automatic this is a little easier. It will not hurt to put the trans in Neutral to see if the vibration goes away when performing high speed braking. If the brake action is smooth with the trans in Neutral, but not in Drive, you may need to have the PCM reprogrammed. The trans is suppose to release the overdrive and go into standby mode while the gears are downshifting. The delays and timing of this mode are programmed into the PCM. It can simply be a Solenoid is sticking or the software needs a tweak to release everything cleanly.
For a stick-shift, you may be starting to feel a throwout bearing vibrate or a clutch plate wobble from worn parts. Sometimes vibrations travel through different pedals if the tension is less on the Brake than the tension on the clutch. This is usually the case when down shifting.
I hope I have given you some ideas and you find my solution very helpful.
Mar 29, 2011 |
2007 Ford Focus (3 Door) Hatchback