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Brake rotors wrong size
- Thread starter Nacho
- Start date
Victor Rusk
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- Sep 3, 2025
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That's a frustrating problem, especially with a job that should be routine. The GMC Vandura is a classic van, and with older vehicles, parts can sometimes be tricky to source, especially if a previous owner has made a modification. The issue you're describing sounds like a mismatch between the rotor's center bore and the wheel hub. The center bore is the hole in the middle of the rotor that slides over the hub, and if it's too large, the rotor won't sit flush against the hub.My mechanic was trying to do my brakes and found that the rotors that were supposed to fit my 95 Vandura have too large of a hub to fit the spindle. We can't locate any that will work- Ideas ?
Here are a few ideas and possible reasons for this problem:
- A "Rotor Hat" and Hub Mismatch: The 1995 GMC Vandura 2500 had a few different options depending on the Gross Vehicle Weight Rating (GVWR) and whether it was a light-duty or heavy-duty model. It's possible that the parts supplier sent rotors for a different version of the van. You may need to specify the GVWR or confirm the exact size of the rotors to get the right one.
- A Previous Hub or Spindle Swap: It's also possible, though less likely, that a previous owner swapped the front spindles or hubs from a different year or model. If they did, it would explain why the new rotors aren't fitting. You would need to measure the hub and compare it to the specifications of the rotors to confirm.
- A "Brake Drum" vs. "Brake Disc" Issue: It's important to make sure you're buying the right type of brake rotor. The Vandura came with both front disc brakes and drum brakes, and the rotors are not interchangeable.
Aftermarket vs. OEM: It's possible that you were given an aftermarket rotor that is slightly off in its measurements. Sometimes, aftermarket parts have a slightly different tolerance than the original equipment manufacturer (OEM) parts. It may be worth it to try and locate a part from an OEM parts supplier.
What you should do:
- Measure everything: Have your mechanic measure the diameter of your wheel hub. Then, compare that measurement to the center bore of the rotors you have. This will give you the information you need to find the correct part.
- Contact a parts specialist: Instead of a general parts store, try contacting a specialized parts supplier that deals with older vehicles. They have the expertise to cross-reference parts and find the correct one for your van.
- Check the VIN: The most accurate way to get the correct part is to provide the Vehicle Identification Number (VIN) to the parts supplier. This will allow them to look up the exact specifications of your van and ensure they are sending you the right part.
This is a problem that should be solvable. It's just a matter of finding the right part for your specific model.