31 replies to this topic

[sibhs]

Hi all, 

I'm working through an issue with my passenger caliper rubbing on the rotor. This evening I played about by swapping rotors and calipers and am making progress in solving the issue.  Please feel free to ad your opinions.

 

The K-frame is being rebuilt and is sitting on a table, this was drum but I have substituted disc components to bring it to standard GTR spec.

 

It felt like the rotor was not seating far enough back into stub axle, I thought maybe the bearing wasn't fitted fully. Checked that and that looked good. Tried the offending rotor on other side and it was fine, swapped offending caliper to other side and that was good.

 

It has to be the stub axle or backing plate. I removed backing plate to make it easier to view, then fitted the drivers rotor and calliper to passenger side and it's all good now.

 

I think it has something to do with the backing plate stopping the seal and bearing from seating fully. Tomorrow I will put the correct calipers and rotors on the correct sides but without backing plate to see if I'm right.

 

Pics to follow soon

 

Cheers

Marty

 

 

[sibhs]

[dattoman]

Are you using the shims between stub and caliper ?

 

http://www.ebay.com....76de3785&_uhb=1

[S pack]

Those caliper to stub axle spacers are bullshit Neil. XU1's never had or needed them.

 

I could be wrong but looks more like Marty is trying to fit XU1 discs into std calipers.

[frash da bucket]

Hi Marty,

Have you made sure that you have torana stub axles and not HR stubs.?

I have seen ths problem over the years,some one using a HR stub,and trying to fit a torana caliper,which won't centre,if its that.

I can see you are using the xu-1 rotor,which is thicker than normal gtr standard rotor.

You can run the gtr rotor in the xu-1 caliper,but not the xu-1 rotor in the gtr caliper,no clearances,and pads won't go in or pad shims either.

 

Regards John.

[dattoman]

I didn't say he had to use them... just asked if he was... 

And yes no spacer between the halves for XU1 thickness discs... if thats what he's using there

[S pack]

I didn't say he had to use them... just asked if he was... 

Apologies Neil, it was just the vibe..................

[sibhs]

Rotors are not the thicker xu1 version. I can get the pads and anti squeal shims to work fine on drivers side. No stub axle spacers used. Not sure about the HR stuff, I presume if one side is ok, my stub axles are correct?

[S pack]

Marty, piss those stupid solid rubber grease seals off and get the original type metal flanged ones. Datto will know the ones I'm talking about.

[S pack]

These are the grease seals to get but I would check with the seller that the seals shown in the pic are the same as the seals you will receive.

http://www.ebay.com....t=true&lpid=107

[dattoman]

The rubber ones... as used on Commodores are chunky

 

You can see the seal difference here

https://www.rarespar...x?product=2761A

 

I think Covs keep them as 401673N @ about $3

 

Don't quote me on the part # though

But its def not 401681N (commodore rubber seal)

[frash da bucket]

Hi Dane,

 

I got a pair at brake pro a coupla years ago,and still have the originals in mine.

 

Regards John.

[sibhs]

Update. Took the backing plate off and fitted the rotor and caliper and all looks good. Looks like the plates pushs the seal out causing the tightness in the bearings. So my options are: try the other seals or leave plates off. I hear they aren't on the XU-1's? Pictures show fitting without plate and then with. Anyone else had this issue? pictures are actually of the side that was ok so otherside worse.

Edited by sibhs, 14 July 2014 - 09:06 PM.

[N/A-PWR]

Hey Marty,

 

I just got my 2 Door 'S' calipers out and was wondering if your disc's are thicker than normal, causing the trouble Mate.

 

Here are the Calipers as they came off the Disc, if this helps:-

 

http://www.gmh-toran...rs/#entry843637

 

 

 

 

or Disc to flange off-set of the re-manufactured ones are different to standard maybe?

Edited by GASPOWER, 14 July 2014 - 09:22 PM.

[rodomo]

I'd fit early Holden, Eh etc. seals and drill a pin hole in the grease cap.

[sibhs]

Hey Marty,
 
I just got my 2 Door 'S' calipers out and was wondering if your disc's are thicker than normal, causing the trouble Mate.
 
Here are the Calipers as they came off the Disc, if this helps:-
 
http://www.gmh-toran...rs/#entry843637
 
 
 
 
or Disc to flange off-set of the re-manufactured ones are different to standard maybe?

Hi Dave, it's not calipers I'm sure, it's either bent backing plate or the seals.

[N/A-PWR]

Hi Dave, it's not calipers I'm sure, it's either bent backing plate or the seals.

 

Can you put Plasticine around the seals, and assemble, and pull apart and see the squish of the Plasticine clearance for a check.

[sibhs]

Can you put Plasticine around the seals, and assemble, and pull apart and see the squish of the Plasticine clearance for a check.

Physically yes! but whether I will is doubtfull. :-)

What purpose does the backing plate serve?  

Obviously not important if not fitted to XU-1.

[sibhs]

That's the negative effect, there must be a positive.

[S pack]

Hi Dave, it's not calipers I'm sure, it's either bent backing plate or the seals.

Hi Marty, they are called shields not backing plates so the name implies they protect the brake rotor from foreign matter.

 

Your own observations have given you the answer to your problem, either discard the rotor shields or discard those thick rubber grease seals and obtain the original type metal flange seals. If you want to attain the factory GTR build look to your resto then keep the shields and ditch those seals.