johninar

I thought I would put this in a separate thread.
What I thought was a front hub grinding turned out to be my rotors hitting the calipers. Not sure how this could happen. Has anyone had this happen? I feel stupid for not seeing that the first time I inspected them. I put some spacers in between the radial bracket and the caliper to keep them out.

sabastian458

ouch that sucks

Aardwolf

I've seen that before, even made a thread on it years ago. I've seen it on a bunch of other cars too. Just the other day I saw some Wilwoods IIRC here for sale with a little lighter marks then that. I run them that way and have been fine for years.

sperkins

Should be fine. Just space them out a little farther.

CHJ In Virginia

Did you switch brands of rotors ? I had the same thing happen although not quite as bad. Originally setup the caliper clearance on one brand of rotor. Changed to a different manufacturer and their O.D. on the rotor was several 1000 ths larger causing a slight rubbing. I just placed a thin washer on each radial mounting stud to move the caliper farther away from hub center.

johninar

No, I have been using OEM

VetteDrmr

How does this happen? Wheel hub deflection?

Bill Dearborn

If the clearance is close the rotor will rub once it gets hot and expands. I had this happen when I installed my LG G Stop kit. Sized everything so the caliper was just missing the rotor. Took it out for a hard test drive and when I came back the rotors had burned some grooves in the calipers. An extra spacer fixed the problem. There were several spacers in the kit. Spacers are better than washers since they are cut straight and most washers aren't straight.

Bill

victorf

^^Not true in regards to trueness between spacers and washers.

All depends on how it was made, trueness depends on end use criteria demands.

johninar

I did not get any spacers with my LG kit. that sucks.
If I had seen spacers it might have dawned on me to look at it.
there were no instructions or drawings or anything. I'm not a mechanic so I learn as I go.
My, I sure get an education here.


I agree it's expansion. Because it would take a few laps before I heard anything. Then after it cools down a tad, no rub. Which is why I never felt it when I was inspecting my brakes/hubs/rotors.

John Shiels

Most washers are made from scrap unless it is a graded washer. Hold a bunch of regular 1/2" washer in a stack and you will see it.

sperkins

You want to space the caliper out on the studs just enough that the pads are at the outer edge of the rotor. Here are a couple of pictures that I took when I ran WW calipers on the same brackets. The last picture shows the washer that I used between the bracket and the caliper (bottom of the pic). Not sure what size it was, but you get the idea.

johninar

Yes, makes sense. Thanks for all the replies!
I'll have this all figured out about the time I'm too old for this.

victorf

I was commenting on Mr. Dearborn's generalization statement. My second sentence addressed that I have a little understanding that dimensional quality is application driven.

Thanks for the enlightenment non the less. And I do appreciate it.

By the way, what is your opinion on double grounded washers ARP mfg. and supplied along with some of their fastener as a set, are those washers graded?

Bill Dearborn

The spacers delivered in my kit were designed to work with the Wilwood caliper. They had a prescribed thickness and were true from side to side. If you run down to Joe Blow's hardware store you may not be able to buy a spacer. Most of the time they only have washers which are cut with no guarantee that one side is parallel with the other and thickness is what it is. You can't get two items that are identical so using them as spacers is at best problematic. I wanted to get more spacers but could only get them from Wilwood at a high price. Both Fastenal and Grainger fell into the same category as Joe Blow.

By the way the same goes for the special nut used to hold the caliper to the stud in the SL6 kits. It is a piece of aircraft hardware. Minimum $6 per nut and not available to the general public except through Wilwood.

Don't lose the parts.

Bill

SouthernSon

Here you go. http://www.aircraftspruce.com/menus/ha/index.html

victorf

I understand you had hardware problems!

Its good to have an general understanding in aerospace verse automotive fastener standard so we won't be caught with our pants down.

Suggest reading: Carroll Smith's - Nuts, Bolts, Fasteners and Plumbing Handbook.

Another way is make your own and combine the best of both standard to your liking!

0Todd TCE

RADIAL SHIMS and NUTS

.015 4x
.030 8x
washers 4x
Jetnuts 4x