[spark29]

I was getting a grinding noise from the right front and knew I needed pads so installed them (WITHOUT the shims, it didn't seem to need them).
Grinding got worse so I bought new front hub with bearings. In the process I looked at the disc and it is getting very grooved on the outside surface. Now I have no idea what's going on; is it the pads? the disc? the caliber (which seems to work fine)? the bearings?

And suggestions would be appreciated. And these questions:

1) Do I need to remove the wheel guide pin on the hub? Chilton guide says I have to but it seems to only screw into the hub, nothing behind it. It doesn't want to budge. Would heating it help to loosen it? How about using an impact wrench? WD-40? Liquid Wrench?

2) Is there an easier way to remove the Allen bolts that hold the dust shield to the bracket (bracket holds the caliber)? Again heating them? WD-40? Liquid Wrench?

Thanks in advance.

 

[sulley007]

If yours is like what I've seen on a '90 740 , forget about Chilton. The disc and hub are separate on your car, not like the setup Chilton is describing. Once the caliper is removed, the disc simply lifts off (after removing the locater pin). The ABS sensor is on the hub not the disc, so you don't touch it at all. 2 bolts hold the caliper - support it after removing the bolts so the weight will not strain the flex lines.

 

[spark29]

Update

Sully - thanks for the info. Here's what happened today.

Got the caliper. pads and bracketoff, could NOT get the wheel locating pin out. Figured I would try just removing the huge hub nut and realized I needed a bigger socket to take it off.

I spun the hub and NO NOISE!

I then put everything back on so I could drive to the parts house but before I put on the wheel/tire I spun the rotor and got the grinding noise again. Considering the state of old pads -almost down to metal and thicker one side I realized I must have warped the rotor.

So now I know I need a new rotor, not a wheel bearing.

Any suggestions for removing the wheel locating pin? The face is so small I can't get any leverage on it to loosen it.

Would vise grips work? What about heating it? Thanks in advance for your help.

 

[Admin]

I believe you use a 10 mm wrench/socket to get it off. Try lubing it well.

 

[matt14]

The locating pin is a 10mm and thats it. My personal suggestion would to be to put replace the pads and rotors. The bearings on those is not real common, and ive never heard them make noises. The only time ive ever repaired was when they were loose. If the brakes are wearing more on one side, more than likely you have a caliper thats holding up.