[FWD4.9]

Have spent two to three months looking for new correct replacement front rotors for a '91 Fleetwood FWD (no heavy duty brake options), but all GM, ACDelco, Raybestos, etc. rotors the parts counters have offered have 14mm stud holes, & my studs are 12mm.

Did Cadillac make a stud size change in this series and then all aftermarket rotors go to 14mm by default to fit the older ones?

I understand that the rotor is clamped between the wheel & spindle hub, but the possibility of rototion during reverse braking is still there....I have even thought about turning bushings or welding up the holes & re-drillling, but the right ones should be out there somewhere.

Any suggestions or thoughts?

 

[ocjmakaveli]

thats odd if they cant help you just go to an auto parts store they'll have the right part

dont the dealers know that 14 mm isnt right for a car?

somehow they arent checking right or there is an error on their computer system

 

[FWD4.9]

Don't like fragging this thread back to the top, but did anybody have this problem when replacing rotors?

NAPA and other local major parts counters were no help either.

 

[Cortezc]

I am a bit fuzzy on the rules of the forum, but I too am having a technical problem with the front rotor hole size.

Every one (rotor) I have looked at has way oversized stud holes. I mean you don't even get to center the rotor. Is there supposed to be internal bushings slide over the studs or something? The rotor is full floating but it just doesn't seem right that the fit should be so sloppy??

Apparantley they have been this way for a long while because I don't see too many inquiries about them....

Does any one have an answer?

 

[bbeck]

I believe you're talking about the hole size for the lugs, correct? well, I don't know if it's the same for your car, but on mine, I guess the rotors fit the firebird and camaro.

 

[Dadillac]

I am not certain to the solution here, but my car has the same issue. Although it really isn't an issue. The rotor is hub centric, as in it sits an the hub ring, and that is how it centers. So if the bolt holes are slightly larger (as in 2mm), it really isn't a problem. Now if the rotor isn't machined for a perfect fit on the hub, then you have a problem.

Don

 

[Supercrew632]

This is normal and all rotors I have seen are like this. Have never had a problem installing them at the dealer, nor has anyone complained. The rotor centers on the hub and your wheel and lugnuts hold the rotor. If you buy gm or acdelco they will be the same. Albeit they are not exactly like the originals, they are a good replacement.
Supercrew632