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 Post subject: Ball Joint
PostPosted: Sat Jan 26, 2019 4:52 pm 
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848cc
848cc

Joined: Fri Oct 06, 2017 1:06 pm
Posts: 33
Fitting a new disc brake system to our Mini and when I pumped grease into the lower ball joint grease came out a small hole behind the disc as seen on attached photos.

Has anyone ever came across this issue and suggestions on what to do.

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Image

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 Post subject: Re: Ball Joint
PostPosted: Sat Jan 26, 2019 7:28 pm 
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1098cc
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Joined: Sat Jul 23, 2011 8:17 am
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Location: san remo nsw
that's to grease the disc so they don't squeak. Just joking, isn't it a bolt hole for guard?


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 Post subject: Re: Ball Joint
PostPosted: Sat Jan 26, 2019 7:45 pm 
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848cc
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There is no thread in the hole.


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 Post subject: Re: Ball Joint
PostPosted: Sat Jan 26, 2019 7:50 pm 
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Location: near Baulkham Hills, NSW
No, the guard if fitted just mounts on the 2 caliper mounting lugs and the steering arm. If hole is threaded put a grub screw in. Or tap it first.
No idea why that hole is there, it's not on original hubs, or aftermarket ones I bought.

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 Post subject: Re: Ball Joint
PostPosted: Sat Jan 26, 2019 9:08 pm 
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1360cc
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I think i’ve seen this before - i think some disc hubs had blank holes in them where the holes would be on a drum hub to hold the back plate on- dont know why though.

To fix it, i’d tap and grub screw plug it.


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 Post subject: Re: Ball Joint
PostPosted: Sun Jan 27, 2019 7:57 pm 
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848cc
848cc

Joined: Sun Oct 13, 2013 5:28 pm
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Location: Hobart, TAS
A couple of plugging options if you don't want to tap the hole. Years ago we used to plug holes in steel hydraulic manifolds with hardened steel balls (ball bearings). By tests we found a 0.250" diameter ball driven into a 0.242" diameter hole would withstand better than 6000 PSI. The same ball driven into a 0.249" diameter hole was good for 3500 PSI. Nowadays hydraulic manifolds are commonly plugged with Koenig expander sealing plugs which maybe another option http://www.schiltec.com.au/

Since there will be little or no pressure involved, a ball with a couple of thou interference should plug the hole forever.


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 Post subject: Re: Ball Joint
PostPosted: Mon Jan 28, 2019 9:44 am 
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Location: Wodonga - Vic/NSW border
I'd be more inclined to contact the supplier and say "WTF?"

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 Post subject: Re: Ball Joint
PostPosted: Mon Jan 28, 2019 3:40 pm 
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848cc
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Joined: Fri Oct 06, 2017 1:06 pm
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Thanks for your replies. I have contacted the supplier an I believe he wants to replace them.

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