newbi help>>>Please

collect1 · 10:45 AM

Bought a 1987 911 a few months ago. My brake sensor came on last week so I decided to replace the pads ect. I replaced the pads, rotors all the way around and bought rebuilt calipers for the front. I put everything on and while the care was up I degrease the bottom of the engine.
I drove my beloved car and now it feels loose and shakes at speeds above 60 mph. I don't know what I could have done to make it feel like this now. Please can someone please advise me on what may have caused this. Any help would be appreciated .

peppy · 11-02-2007, 10:47 AM

Check the lug nuts for tightness. Just a guess.

collect1 · 11-02-2007, 10:49 AM

thanks but I did torque to 94lbs

stealthn · 11-02-2007, 10:54 AM

Hard to say with that description. Backtrack what you did, did you touch/change/damage anything to do with the steering, sway bars?

When you say "loose" what do you mean?

DaddyGlenn · DaddyGlenn's Garage

I'm guessing something wrong in the installation of one or more of the rotors causing a mis-alignment of a wheel.

Where are you located? Perhaps there is a local Pelican who can help out.

collect1 · 11-02-2007, 10:56 AM

car shakes and feels unstable, I did nothing but the brakes, The rotors had me a little puzzeled becasue they are only held on by 2 small screws, do they need to be torqued?

livi · 11-02-2007, 10:56 AM

Welcome to the forum!

Please post pics of your car. We all love them and can´t get enough!

Could you have a sticking caliper, not realising the pad thouroughly ? Do you hear any strange sounds at lower speeds ?

Do a search. There have been a multitude of threads on similar topics.

Again, welcome !

AvonGil · 11-02-2007, 10:57 AM

I would check them again.. I bet one of them is loose or something is not seated correctly.

collect1 · 11-02-2007, 10:57 AM

I am in manteca ca and anywhere in the bay area, Help would be great!!!

collect1 · 11-02-2007, 11:00 AM

I will post a pick tonight. no strange sound a low speeds, When I had the car up and would spin the front wheels it seemed to rub then stop then rub again (wheel spinning). There should be no rub at all?

AvonGil · 11-02-2007, 11:04 AM

Are those little screws flush? If not the wheel will not seat flush against the rotor. The rotor does not see any axial force, so the 5 14mm wheel studs hold it steady in the radial direction. The little screw holds it in the axial direction so it does not flop around when you take a wheel off.

collect1 · 11-02-2007, 11:06 AM

they seemed flush, I did not torque them, should I have?

stealthn · 11-02-2007, 11:11 AM

Quote:

Originally Posted by collect1

I will post a pick tonight. no strange sound a low speeds, When I had the car up and would spin the front wheels it seemed to rub then stop then rub again (wheel spinning). There should be no rub at all?

That's a problem, either sticking calipers, rotors out of round, or like others have said something not quite right put back.

Jackup the front and see if you can figure out where the wheel is sticking, I would take the wheels off and have a look at everything and test the rotor, pads, calipers. Good luck.

collect1 · 11-02-2007, 11:34 AM

thanks I guess I will do It all over again, so when I spin the hub I should not rub on the pads right?

livi · 11-02-2007, 11:57 AM

It is not uncommon that the pistons in the caliper have become a little reluctant to move smoothly in and out, thus clinging to the pad. I usually work the pistons by hand in and out, with a drop of 'friction-freeing' oil/liquid to make them move freely.

Tim L · 11-02-2007, 12:02 PM

Take the wheels off and put the lug nuts back on and torque them. Then spin the rotor there should be no wobble or intermittent rub on the pads, check that the two screws are tight at this point.

ZOA NOM · ZOA NOM's Garage

I had the same thing happen when I installed the rotors on the rear hubs using the wrong holes for the two screws that hold them on. Two of the holes have a recessed bevel, and two don't. The screws must be in the beveled holes, or the hub will not sit flush. You can also remove the screws entirely. They serve no purpose once the lugs are tightened.

oneblueyedog · oneblueyedog's Garage

Maybe you switched tires from side to side and the rotation is opposite? I did that one time.

AvonGil · 11-02-2007, 04:08 PM

Quote:

Originally Posted by ZOANAS

I had the same thing happen when I installed the rotors on the rear hubs using the wrong holes for the two screws that hold them on. Two of the holes have a recessed bevel, and two don't. The screws must be in the beveled holes, or the hub will not sit flush. You can also remove the screws entirely. They serve no purpose once the lugs are tightened.

I'm pretty sure thats the problem. I also had this happen to me once on a volvo. I second the motion. Take those screws out and go for a spin.

Quicksilver · 11-02-2007, 04:47 PM

It seems likely that it is the seating of the tires as listed above but I noticed you mentioned that the rotors are, "only held on by 2 small screws". The front rotors are held on by 5 bolts that need to be torqued down to the hub assembly and then that needs to be assembled so the bearing preload is correct. The rear has the little beveled screws that should be completely flush with the rotor.

Check the rear rotors as suggested because that would cause a high speed shimmy.

If it is still doing this try grabbing the top of the front wheels and pull them in and out. If the wheel bearings are misadjusted there will be a clunk. A very minor (almost unnoticeable) clunk is permissible. Anything more then barely discernible is too much. Loose front wheel bearings will cause the car to track back and forth over any variation in the road and every crack in the road will have a bit of a tooth rattling jar to it.

BTW - It is normal to have a little rotor drag. It is preferred that it be completely even but a slight unevenness isn't too uncommon. But unless it is truly drastic it won't cause the car to drive weird until you get on the brakes.