Brake Drum Restoration - and query

Issues with shocks/springs, tires, steering box, stopping, etc.
Post Reply
User avatar
ako
Posts: 159
Joined: Sat Jan 17, 2015 11:41 am
Location: UAE

Brake Drum Restoration - and query

Post by ako »

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. :)
User avatar
Hotzenplotz
Austria
Posts: 371
Joined: Wed Jan 18, 2012 9:07 am
Location: Vienna, Austria

Re: Brake Drum Restoration - and query

Post by Hotzenplotz »

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.
Cheers
Albert
========================
My Pinz has NEVER been with any army
User avatar
ako
Posts: 159
Joined: Sat Jan 17, 2015 11:41 am
Location: UAE

Re: Brake Drum Restoration - and query

Post by ako »

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.
Profpinz
Australia
Posts: 1056
Joined: Sat Apr 17, 2004 7:08 pm
Location: Melbourne, AUSTRALIA
Contact:

Re: Brake Drum Restoration - and query

Post by Profpinz »

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 :(
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
User avatar
ako
Posts: 159
Joined: Sat Jan 17, 2015 11:41 am
Location: UAE

Re: Brake Drum Restoration - and query

Post by ako »

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:
User avatar
TechMOGogy
Canada
Posts: 2831
Joined: Wed Feb 01, 2012 11:39 am
Location: Ontario, Canada

Re: Brake Drum Restoration - and query

Post by TechMOGogy »

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 http://real4x4forums.com/PinzgauerBBS/v ... 128#p57128
72 Pathfinder | 75 710M 2.7i | 96 350GDT Worker
63rover
Canada
Posts: 239
Joined: Thu Oct 10, 2013 8:18 pm
Location: Mt. Hope, Ont., Canada

Re: Brake Drum Restoration - and query

Post by 63rover »

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
User avatar
ako
Posts: 159
Joined: Sat Jan 17, 2015 11:41 am
Location: UAE

Re: Brake Drum Restoration - and query

Post by ako »

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:
User avatar
TechMOGogy
Canada
Posts: 2831
Joined: Wed Feb 01, 2012 11:39 am
Location: Ontario, Canada

Re: Brake Drum Restoration - and query

Post by TechMOGogy »

Looks great!
72 Pathfinder | 75 710M 2.7i | 96 350GDT Worker
krick3tt
Posts: 2457
Joined: Thu Mar 16, 2006 6:48 pm
Location: Denver, CO USA

Re: Brake Drum Restoration - and query

Post by krick3tt »

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.
Any man who thinks he can be happy and prosperous by letting the government take care of him:
better take a closer look at the American Indian.---Henry Ford
User avatar
Jimm391730
United States of America
Posts: 1456
Joined: Wed Apr 14, 2004 10:58 pm
Location: Idyllwild, CA

Re: Brake Drum Restoration - and query

Post by Jimm391730 »

Nice job!
Jim M.
712W and 710M
Texas710
United States of America
Posts: 247
Joined: Thu Jan 22, 2015 4:00 pm
Location: San Antonio, TX

Re: Brake Drum Restoration - and query

Post by Texas710 »

Thanks for the pictures, have read about the procedure, but visuals help.

Nice job, BTW.
stiffler4444
Canada
Posts: 776
Joined: Mon Mar 15, 2010 1:46 pm
Location: Crystal Beach ON CAN

Re: Brake Drum Restoration - and query

Post by stiffler4444 »

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 http://real4x4forums.com/PinzgauerBBS/v ... 128#p57128
Ha! Wondered what those were for!
1972 710m
Post Reply