Brake calipers

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John Vardanian
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Brake calipers

Post by John Vardanian »

Would anyone post a close up picture of the bolts that hold the disk brake caliper pots onto the caliper. Need to see the inscription on the head of the bolt and the type of plating. Thanks.

john
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gsjohnson
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Post by gsjohnson »

Will a 330 do? I have my front wheels off as we speak if it is of any use.
GS
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Tom Wilson
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Post by Tom Wilson »

I can get GTE shots if that will help.
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JAV
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Post by JAV »

John,

I'll try to take some of my Lusso tonight. Are rears ok?
John Viveiros
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John Vardanian
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Post by John Vardanian »

Thanks guys. I'd imagine all the early mid sixties calipers are the same, regarless of type of car. They are Dunlop or Girling. Mine are Dunlop.

The Lobo brand fasteners are used throughout the car, but the brakes have some other brand and I am not sure if they are black oxide. Mine were replaced with Allen head type bolts in the 80's.

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Tom Wilson
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Post by Tom Wilson »

My bolts were too rusty to identify the original finish, but this should help you find the right bolt:

<a href="http://i107.photobucket.com/albums/m290 ... -Small.jpg" class="postlink"><img src="http://i107.photobucket.com/albums/m290 ... -Large.jpg" border="6"></a>

There has been a lot of discussion on how to plate (or paint) these parts, but I refer to an article Dyke Ridgley wrote in the Ferrari Market Letter Tech Tips colomn back in April 1992, called appropriately "Correct Plating Finshes for Dunlop And Girling Brakes". He said the manufacturers of the caliper unit of both Dunlop and Girling systems "protected these parts from the elements by plating them in a cadmium wash...Literally all the peices of the caliper were plated, including castings, pistons, cylinders, nuts, bolts, washers and bridge pipes." He goes on to say that as cadmium plating is not always available, "I reccomend, and Ferrari concours judges accept, bright zinc plating." Just our two cents worth...
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John Vardanian
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Post by John Vardanian »

Thanks Tom Wilson,

This confirms that I only have a few of these Newton bolts left. The rest have been replaced.

Interesting thing about the cadmium wash. I noticed that my gearbox was shot with silver paint in its entirety, seemingly after it was all assebmbled. Though, today we don't overspray the beautifully black oxided nuts and bolts with silver paint.

john
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JAV
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Post by JAV »

Tom,

I read that article as well. I have a few platers that I use (and trust)- none of them do Cad. I have a bright zinc plating setup but the problem with most electro-deposited finishes (like zinc) is that it's very difficult to get adequate plating on complex shapes due to the nature of current flowing through the electrolyte.

I've been trying for a couple of weeks to get my caliper frames plated and I've tried all the tricks I know of (including suspending extra anodes inside the ears) and I'm not happy with the results. The internal areas are always underplated and as soon as I go to chromate them, I'm back down to bare casting.

At this point, I'm probably going to try a bath style plate like electroless nickel just to get protection.
John Viveiros
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330GT
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Post by 330GT »

Cad plating is hard to find by due to the toxic disposal issues. There's a place in Seattle that I use that does a lot of plating for the aircraft industry. So look beyond the auto plating people to industrial places and you might find someone local.
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Tom Wilson
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Post by Tom Wilson »

Karp's Brake Service in the Los Angeles area (see Tom's Suppliers Page) has a guy who can do Cad Plating. I have not tried him yet, but he will probably be the one to do my brakes.
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John Vardanian
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Post by John Vardanian »

JAV wrote:Tom,

I read that article as well. I have a few platers that I use (and trust)- none of them do Cad. I have a bright zinc plating setup but the problem with most electro-deposited finishes (like zinc) is that it's very difficult to get adequate plating on complex shapes due to the nature of current flowing through the electrolyte.

I've been trying for a couple of weeks to get my caliper frames plated and I've tried all the tricks I know of (including suspending extra anodes inside the ears) and I'm not happy with the results. The internal areas are always underplated and as soon as I go to chromate them, I'm back down to bare casting.

At this point, I'm probably going to try a bath style plate like electroless nickel just to get protection.
John,

Would it help if you created turbulence in the water, like using an aquarium air pump or fountain water pump?

john
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JAV
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Post by JAV »

John,

I already have agitation... still no worky. I get no plating in the holes (which rust in short order do to the acid pickel) and the insides of all the deep cavities get just a superficial film.
John Viveiros
1964 250 GTL
John Vardanian
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Post by John Vardanian »

Any thoughts on where I can get these "Newton" bolts? Thanks.

john
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