Caliper rubbing rotor

[aussiewannabee69]

Hi I'm in the process of tearing down my 69 coronet. I have found that my RHS rotor is rubbing on the caliper. I've pulled it apart, cleaned it up and it still rubs.
I'm glad I made the decision to completely re do the car before driving it. Have found a few issues from one of the previous owners.

 

[MoparLeo]

OK You have 73 and up calipers on a 69 car. What else was changed and where are the calipers hitting ? Can't see it in the picture you show.

 

[aussiewannabee69]

Hi I'm in the process of tearing down my 69 coronet. I have found that my RHS rotor is rubbing on the caliper. I've pulled it apart, cleaned it up and it still rubs.
I'm glad I made the decision to completely re do the car before driving it. Have found a few issues from one of the previous owners



You can see the bottom of the pad rubbing on the hub. The top part of the rotor is also rubbing on the calipers.

View attachment 1211775

 

[PurpleBeeper]

MoparLeo has a good eye. I am not an expert on this, but there is a common brake conversion done on these cars to convert to 1973+ brake rotors, 73+ A-body spindles. Some of the conversions are done using Cordoba rotors and caliper brackets. "Maybe" the previous owner started to do one of those conversions and got mixed up on exactly which parts to use? Or they simply got the wrong parts and put them on?

As I mentioned, I'm not an expert on this, but I did one of those swaps on my 1970 car and your rotors kinda look like my 73+ rotors. So....maybe check for any numbers you can find on the calipers, rotors, caliper brackets and spindles and let us know. (larger pictures would help too). There are many number experts on here that can figure this out for you. Maybe also check the other side and see which parts are different?

 

[Beekeeper]

What size are the rotors 10.94 or 12”?

 

[Don Frelier]

It could just be a case where the caliper mount is worn where the caliper slides allowing the caliper and pads to drop down further than the original configuration. Maybe just need a new mount.

 

[gkent]

Those brackets are for the smaller 10.9?" rotors - not the 11.75" ones. Since only one is rubbing it seems strange you would have either two different brackets or two different rotors.

 

[69SportSatellite]

This problem can occur even with brand new matching parts. I had (well still have) this issue with a replacement PST caliper (shown below). The original caliper failed and PST had their distributor send a replacement in 2020. As you can see, the pad is rubbing on the hub. Everything to do with my front brakes and suspension came from PST so I can only guess the manufacturer changed the dimensions of the calipers, sliders or pads between 2015 and 2020. The PN's are the same, the products apparently aren't. New or old sliders, new or old pads, it doesn't matter - the pad still rides on the hub. I am not an expert in this area but from my observation and measurements, the calipers are different, the newer one is smaller, allowing the pad to sit lower than it should.

Despite numerous emails and calls to both PST and their distributor, the issue remains unresolved. They said they couldn't figure it out, don't know why this occurred; they just threw in the towel and stopped responding to my calls and emails.

A lifetime warranty is really only that if the replacement parts fit and work. A brake failure is not something you want, and I no longer feel comfortable with any of the PST brake components on my car. I am looking into having everything replaced this spring. If I am missing something obvious here, feel free to let me know.

 

[pnora]

Hi I'm in the process of tearing down my 69 coronet. I have found that my RHS rotor is rubbing on the caliper. I've pulled it apart, cleaned it up and it still rubs.
I'm glad I made the decision to completely re do the car before driving it. Have found a few issues from one of the previous owners.

View attachment 1211775

Is it the pad that is hitting the rotor? If so it looks like the pads are loose and need to have the tabs bent to hold it securely in the caliper.

 

[pnora]

This problem can occur even with brand new matching parts. I had (well still have) this issue with a replacement PST caliper (shown below). The original caliper failed and PST had their distributor send a replacement in 2020. As you can see, the pad is rubbing on the hub. Everything to do with my front brakes and suspension came from PST so I can only guess the manufacturer changed the dimensions of the calipers, sliders or pads between 2015 and 2020. The PN's are the same, the products apparently aren't. New or old sliders, new or old pads, it doesn't matter - the pad still rides on the hub. I am not an expert in this area but from my observation and measurements, the calipers are different, the newer one is smaller, allowing the pad to sit lower than it should.

Despite numerous emails and calls to both PST and their distributor, the issue remains unresolved. They said they couldn't figure it out, don't know why this occurred; they just threw in the towel and stopped responding to my calls and emails.

A lifetime warranty is really only that if the replacement parts fit and work. A brake failure is not something you want, and I no longer feel comfortable with any of the PST brake components on my car. I am looking into having everything replaced this spring. If I am missing something obvious here, feel free to let me know.

View attachment 1211957

Look at your pads. There is a big gap between the pad and the caliper. You also need to bend the tabs to securely lock the pad into the caliper.

 

[pnora]

If you look at the green circle you can see the gap on the tab side. You need to fit the pads to the calipers by bending these tabs. The pads need to fit tight not loose the way you have them.

 

[hunt2elk]

If you look at the green circle you can see the gap on the tab side. You need to fit the pads to the calipers by bending these tabs. The pads need to fit tight not loose the way you have them.

View attachment 1211969

Yeah, you would have thought that would have been the first thing PST asked about after receiving the call that they didn't fit.

 

[gkent]

Hmmm, there is a difference between inner and outer pads. I think that's 69SportSatelite's problem.

 

[MoparLeo]

Try a different set of pads.
Install them correctly.
The radius of the inside of the pad does not match the radius of the rotors hub.
If new parts are not available, simply polish the area of the pads backing plate that is contacting the rotor hub. It will have no effect on the integrity of the pad or braking.

 

[pnora]

Hmmm, there is a difference between inner and outer pads. I think that's 69SportSatelite's problem.

Yes they are different however they will only fit one way.

 

[pnora]

Hi I'm in the process of tearing down my 69 coronet. I have found that my RHS rotor is rubbing on the caliper. I've pulled it apart, cleaned it up and it still rubs.
I'm glad I made the decision to completely re do the car before driving it. Have found a few issues from one of the previous owners.

View attachment 1211775

You can clearly see a big gap here. You need to bend the tabs and make those pads fit tight as possible into the caliper. You can chase deer through that gap its so wide.

 

[gkent]

Ok, the gaps in green ... no problem the bottom ones are seated and so are the top ones. The gap in red is the problem. If the caliper is moved up (with a different bracket) then that gap will disappear and the pad will clear the rotor. OR change the rotor to the small dia. one and that might work. Either way, I don't think the issue is the pad - its in its proper place.

 

[pnora]

Ok, the gaps in green ... no problem the bottom ones are seated and so are the top ones. The gap in red is the problem. If the caliper is moved up (with a different bracket) then that gap will disappear and the pad will clear the rotor. OR change the rotor to the small dia. one and that might work. Either way, I don't think the issue is the pad - its in its proper place.

Its the pad its to loose and dropping down. Bend the tabs and it will pull the pad up. The fix is plain as day. Blow the picture up. The green circles show how much of a gap there is. That end the pad is shown sitting higher. The tab still needs to be bent to keep the pad up. The opposite end the tab is hitting but the pad is hanging down. That is allowing the pad to rub the rotor. I always bend the tabs so the pad needs to be lightly tapped into the caliper for proper seating. Both people have the same problem. Parts are correct. I could have both fixed in less time than it took me to type this. Blow up the pictures and you can clearly see the problems.

 

[69SportSatellite]

I wasn't aware that you could bend the tabs to make them fit - the driver's side is fine as it came from PST. Believe me, I sent multiple detailed pictures to both PST and their distributor - no one mentioned modifying the pads. Again, I am not a brake expert by any means, but I will look into this as a possible solution.

Always learn something new on FBBO - thank you to all who responded to this thread.

 

[69SportSatellite]

Try a different set of pads.
Install them correctly.
The radius of the inside of the pad does not match the radius of the rotors hub.
If new parts are not available, simply polish the area of the pads backing plate that is contacting the rotor hub. It will have no effect on the integrity of the pad or braking.

I tried the original pads which fit with the old caliper and they too sat on the hub.