The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

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 Brake Drum Restoration - and query 
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Joined: Sat Jan 17, 2015 11:41 am
Posts: 159
Location: UAE
Post Brake Drum Restoration - and query
So I am painting my rims and cleaning up my brake drums as I work my way around the 6 of them.

Ther manual says to check the internal face is 285mm standard and 287mm at the wear limit. Will get the verniers out for that job.
Image

The manual says to put the bolts in the two extra holes to force the drum off. For those of you in America who might need to order in some bolts before the job, you a metric M10 x 45mm (or so) length bolt.

Image

Screwing in the bolts at an equal rate will get you to this position :

Image

View of the brake linings and the hub. This side seems more worn than the others. Will need to check measurements again :

Image

So now I have removed all the rust from the outside face which mates up to the rim. Note the hammer strikes on the face from the previous 'mechanics' :

Image

And cleaned up the inside face which mates to the hub :

Image

So now my question - would you consider painting any of the surfaces to prevent rust coming back. Something like a VHT high temp paint?

Of course I would mask up the contact (braking) surface before painting.

My concern would be the layer of paint would prevent the drums from radiating the heat away. Never done much work on drum brakes before, so putting this one out to the experts.

On the other hand I get anal retentive about rust and lie in bed at night worrying about it :mrgreen:

Thanks for any advice offered. :)


Fri Oct 23, 2015 1:21 am
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Joined: Wed Jan 18, 2012 9:07 am
Posts: 162
Location: Vienna, Austria
Post Re: Brake Drum Restoration - and query
short answer: I had my drums sandblasted, and then I used a heat resisting "oven paint" that is said to last up to 600 °C.

I used masking tape for the contact area with the rim; and covered the whole rear opening with a piece of paperboard.Then I painted the drums with a brush to "rub in" the paint to the raw sandblasted surface.

No issues so far.

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Fri Oct 23, 2015 1:53 am
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Joined: Sat Jan 17, 2015 11:41 am
Posts: 159
Location: UAE
Post Re: Brake Drum Restoration - and query
OK. Great. Thanks.

My only concerns were overheating as I am probably 30-50C higher ambient temps than you at any time.

But after second thoughts a clean painted surface probably transfer heat better than built up rust anyway.


Fri Oct 23, 2015 2:15 am
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Joined: Sat Apr 17, 2004 6:08 pm
Posts: 1053
Location: Melbourne, AUSTRALIA
Post Re: Brake Drum Restoration - and query
Your brake drums are looking good!

However out of necessity, I went one step further when I "rebuilt" my 712 drums a few years ago, as they were pretty much knackered.
Firstly I sand blasted the whole lot (braking surface as well) then I had the braking surfaces metal sprayed and machined back to factory original specs.
Finally I sprayed them with a thin coating of heat proof paint......and no heat problems even in Australian Summers :D

Yes, it would have been easier just to buy new drums, but not only was the purchase cost high, but also the shipping costs (given the weight) to Aus were....hmmm...high :(

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Peter

1974, 712 6X6 Pinzgauer
1983, 710-1.6 4X4 Pinzgauer
1997, 718 6X6 Pinzgauer (in pieces)
1971, 700 Haflinger
1974, 703 LWB Haflinger
2001, Range Rover

http://www.ozpinz.com


Fri Oct 23, 2015 3:49 am
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Joined: Sat Jan 17, 2015 11:41 am
Posts: 159
Location: UAE
Post Re: Brake Drum Restoration - and query
I know what you mean about shipping.

From the USA I pay 10 USD / lb or that's 22 USD a kilo.

Hate to think what 6 drums in packaging would weigh :shock:


Fri Oct 23, 2015 3:59 am
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Joined: Wed Feb 01, 2012 11:39 am
Posts: 2253
Location: Ontario, Canada
Post Re: Brake Drum Restoration - and query
ako wrote:

The manual says to put the bolts in the two extra holes to force the drum off. For those of you in America who might need to order in some bolts before the job, you a metric M10 x 45mm (or so) length bolt.


Just for info:
The bolts to remove the drums should be located in the bulk head behind the driver and passenger in the cargo area
See post by Paul here viewtopic.php?p=57128#p57128

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Fri Oct 23, 2015 7:33 am
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Joined: Thu Oct 10, 2013 7:18 pm
Posts: 185
Location: Mt. Hope, Ont., Canada
Post Re: Brake Drum Restoration - and query
As far as heating and cooling are concerned remember the principles of physics apply universally. Darker colours absorb and radiate heat fastest. Lighter colours do so slower. Black high heat would be a great choice. (The old air cooled Triumph motorcycles used to come with black painted cylinder cooling fins. Others didn't do so only to save money on manufacturing.)

Cheers, Clive


Fri Oct 23, 2015 3:51 pm
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Joined: Sat Jan 17, 2015 11:41 am
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Location: UAE
Post Re: Brake Drum Restoration - and query
So following the advice of above, the drums were full stripped back to bare metal and painted with a Rustoleum Black calliper paint.

The I made a quick acad template to paint the inside of my hub to match the rims. Will need to sort out the rest of the hub when I sort the leaks on the portals.

Image

Doesn't look too bad for a rattle can job :

Image

Then I sanded about 6-8 layers of paint off the rim and painted it Krlyon camouflage ultra flat Olive. I know I still need to do the wheel nuts.

Image

The white on the tyre is overspray from when the truck was decommissioned, will need all new rubber anyway, just saving up for that one.

Thanks to all that offered advice, now to repeat on 5 more drums. :mrgreen:


Sat Oct 24, 2015 1:34 am
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Joined: Wed Feb 01, 2012 11:39 am
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Location: Ontario, Canada
Post Re: Brake Drum Restoration - and query
Looks great!

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75 710M 2.7i
96 350GDT Worker


Sat Oct 24, 2015 4:31 am
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Joined: Thu Mar 16, 2006 6:48 pm
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Location: Denver, CO USA
Post Re: Brake Drum Restoration - and query
I sprayed the rims and nuts at the same time. Every time the wheel is removed or installed the nuts will have to be repainted.

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Sat Oct 24, 2015 5:59 am
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Joined: Wed Apr 14, 2004 9:58 pm
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Location: Idyllwild, CA
Post Re: Brake Drum Restoration - and query
Nice job!

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Jim M.
712W and 710M


Sat Oct 24, 2015 11:27 am
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Joined: Thu Jan 22, 2015 4:00 pm
Posts: 126
Location: San Antonio, TX
Post Re: Brake Drum Restoration - and query
Thanks for the pictures, have read about the procedure, but visuals help.

Nice job, BTW.


Sun Oct 25, 2015 7:33 pm
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Joined: Mon Mar 15, 2010 12:46 pm
Posts: 698
Location: Crystal Beach ON CAN
Post Re: Brake Drum Restoration - and query
TechMOGogy wrote:
ako wrote:

The manual says to put the bolts in the two extra holes to force the drum off. For those of you in America who might need to order in some bolts before the job, you a metric M10 x 45mm (or so) length bolt.


Just for info:
The bolts to remove the drums should be located in the bulk head behind the driver and passenger in the cargo area
See post by Paul here viewtopic.php?p=57128#p57128


Ha! Wondered what those were for!

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1972 710m


Mon Oct 26, 2015 6:42 am
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