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Discussion Starter #1
Does anyone know the original application for a large iron two piston caliper that bolts onto the front spindles of a 115 series car, and that has the number "33" embossed on the side of the caliper near where the brake line connects?

I need to rebuild the calipers and don't know where/how to get replacement seals, etc. Any advice would be appreciated.

Thanks.

TA
(OldAlfaguy)
 

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Hi,
They're probably VW Bus/Transporter calipers, it's a fairly normal swap when using the 3.5" (later) uprights. But I can't be definite about this as I haven't had them myself.
/Neil
 

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Calipers?

Aren't these just the standard 2L caliper? What makes them over sized? What pad do they use? The standard Alfa caliper has 48MM pistons and the kit is easily available.
KG
Alfas Unlimited
 

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My Duetto has the VW buss front calipers and the pads are about 20% larger than ther Alfa ones !
To replace pads, go to your parts store with your old pads and match up new ones.
 

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Discussion Starter #5
Like 101/105 Guy says, the calipers are larger, and so are the pads. Quite a bit larger.

After searching the online parts web sites, it looks like the VW Van/Transporter from 73 thru 85 used either an Ate or a Girling caliper, not changing thru the years.

The VW Ate caliper piston is 54 mm, larger than the Alfa front caliper piston at 48 mm.

Thanks for the help.

OldAlfaGuy
 

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pads?

Is the pad just wider, or does it overhang the outside of the rotor?
Any idea how much heavier the caliper is than stock 2L?
KG
 

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Discussion Starter #7
Keith,

I'll weigh a caliper when I have them off the car, and take some measurements on the pads. They appear to be wider, not sticking out beyond the rotor.

Ted
(OldAlfaGuy)
 

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Here's a little better pic.......
Don't worry about the extra weight. You're not running at LeMans this year are you ??
 

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So would these calipers be a direct bolt on replacement for the standard caliper on an S2 Spider?

Best regards,
 

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Discussion Starter #11
Yes, I think so. You may have to play around with the brake line/hose assembly.

Shop the Internet. I found some great pricing for rebuilt units, even paying the core charge they are still a bargain. And some come "loaded" (with pads).

OldAlfaGuy
 

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So, i bought '71 Transporter calipers and they seem to fit the stock '74 GTV pads and stock '74 GTV rotor. however, the brake line attachment location is 90deg off from the stock GTV. anyone got a pic of how they ran the lines? i'm conflicted whether to run the flex line directly into the caliper (seems like it puts significant flex into the line, or trying to run a new hard line from the caliper to the flex... (though the obvious location seems to interfere w/ the flex line locations). any suggestions?

thanks!
 

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some bmw too - don't have the details here tho'
 

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Yes i have the ATE pot calipers on my 105 from an old 5or7 series and they bolt straight on, i use montreal vented discs with small 5mm spacer and all is great. Depends on which model bmw and year as they are different sizes.
 

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GTVGuy,
Generally I think you should *not* run a flex line into a caliper, it's a good way of having it loosen. Better is to emulate the factory, use a hard line "pigtail" into the caliper, and secure the end of the flex line at a bracket with a jam nut. Yes, you probably can re-bend the existing pigtail I would guess.
My 2 cents at least.
Neil
 

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thanks, i think i've got it figured out. however, one of those straight blade screws that retain the rotor onto the hub is frozen in place and i've almost munched the screw. any suggestions? i've WD40'd it for the past 2 days and nothing.

thanks,
Kyle
 

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I usually have good success using the hand held impact screwdriver. The one that you hit the end with a hammer and it puts a twisting motion on the screw.
Got mine at Sears.....
 

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Discussion Starter #19
Heat the area good with a propane torch. Then tap around it with a brass hammer to help break things loose in there. Works every time for me.

OldAlfaGuy
 

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Impact driver from Harbor Freight worked for me. I then replaced the screws with new ones... coated with anti-seize.
 
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