grinding noise when moving

[Bizzydakid]

So I finally had time today to dig deeper into my problem. I jacked the front end up, removed wheel, and spun the hub assembly w/ rotor and calipers attached. I noticed the pulsating noise when I did this. Then I removed the caliper and rotor, and performed the same test. I did NOT notice a pulsating noise/ grinding noise. Holy dumb f***, ausie, you could be right lol. But due to my lack of expertise, I can't be sure if the bearing can still be a culprit because when I spin the hub by its self, I can't here anything, but I can kind of FEEL a slight thumping sensation via vibrations. I placed one hand on the cv joint going into steering knuckle and turned hub with the other hand. I did not feel anything from the joint. Could this "thumping" be comming from the wheel bearing??? Again, it is VERY subtle.

 

[Bizzydakid]

I am very confused with this situation because the sound my car makes when I drive it doesn't resemble a bad wheel bearing, yet the noise is NOT affected when I apply, release brake pedal....jaosdghiafskjbvai auewyrhnaiwugf dlasm. But when I remove rotor/calipers, I don't notice the noise when I spin hub...WTFFF!!?!?!?

 

[DC Guardian]

hmm im in on this, i wanna know in case it happens to me. Quite a mystery...

Sent from my DC4

 

[Bizzydakid]

Im gonna strangle the fool i bought this car from. Bad ignition timing to start. Fixed that. Seaping valve cover gasket. Waiting for new studs so i can fix that. Now heres something interesting: i took uapart rotao on other side to conparr turning ability. Noticed two screws holding rotor to hub; the other side does NOT have these screws in place...sooo im guessing rotor is wobbling when im driving and hitting break pad every revolution or so....piss! Now can someone ezplain to me what my hub should feel like when i spin it? Should it be completely smooth???

 

[myfirstacura]

grasp the hub with both hands from the flange side and see if you can move it from side to side..it should be smooth and a little bit of drag but no harsh or grinding noise....my 94 had bad bearings in it and I could move the hub side to side by grasping both sides...

 

[Bizzydakid]

What do you mean side to side? Like left to right in its axis? Or left to right like turn it left to right?

 

[myfirstacura]

left to right in its axis

 

[Aussie]

Go get the rotors turned and see if that helps. Like I said, always start with the cheapest and easiest.

 

[Aussie]

Go get the rotors turned and see if that helps. Like I said, always start with the cheapest and easiest.

Also check the top and bottom of your caliper to see if its grooved. Sometimes they warp in an oblong shape and rub into the actual caliper. This will make that noise whether brakes are applied or not.

Btw, it's Aussie not ausie, don't butcher something so simple!

 

[Bizzydakid]

I'm getting ZERO play when I wiggle hub side to side, up down. well, i get a little bit going side to side but common sense tells me thats normal because thats the way the wheel turns via steering system. The only other possible culprit could be brakes. I will do a more in depth look at brakes in the AM.

 

[dimebatch]

the wheel hub has nothing to do with steering... just spinning the wheels. steering is in the rack and knuckle. wiggle the hub back and forth towards yourself and away from yourself alternating between sides.. the hub should spin smooth.

 

[Bizzydakid]

Im buying a dial indicator this week so I can measure rotor run out and check the hub as well. It's the only thing that makes sense to me at this point :/

Hub spins relatively smoothly. I crapped myself pulling the damn hub at every angle and I don't notice any play....so yea

Visually, the rotors and pads look ok. No obstructions in dust shield. If after using the dial indicator and taking my rotors to machinist everything checks out, then I'm just gonna wing it and get my wheel bearing changed...f*** it...Ill keep it posted

 

[Merlins Beard]

Also those screws are not needed. They were put on the car during the assembly process to keep the brake rotors in place before the wheels are put on. Once the wheels go on they don't do anything.

 

[Bizzydakid]

I figured as much. Nothing is ever so simple lol.

Does anyone have specifics on runout for hub??? I know rotor's limit is .004. I got a haynes manual(gross, i know) with no info on this. Can't find anything on internet either.


edit: I r retard. Runout for hub has to be .004, too....cus rotor attaches to it....right??? Unless rotor is warped....right???

 

[Aussie]

You would need to measure them seperately for accurate readouts. Plus your measuring your rotor on X axis while the hub is on Z