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Discussion Starter #1 (Edited)
Hi All,

Can anyone tell me what the original piston diameter of the front calipers is ?

1900CSS 1 1/4 inch ??

102 spider 1e and 2e serie 1 1/8 inch ??

1900CSS and 1e seri 102 have the same look

2e seri 102 is different ( self adjusting brake shoes )

I want to convert my 1900CSS to the "improved" self adjusting 2e seri 102 brake system

rgds Franco


rgds Franco
 

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I'll try and get some measurements for you tonight.

If I remember correctly, the 'rebuild kits' for the 2nd series cylinders have rubbers that measure 1 /12" front and 1" rear.

Tony Stephens at Alfa Stop will know for sure.
 

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In order to convert to self adjusting brakes you must change every element of the brake system. The internal diameter of the wheel cylinders is the same for early and late 102, but every other item on the brake is different. The backing plate, cylinders, connecting pipes, brake shoes, etc are all different. I expect you could install the entire wheel brake system from a late car onto an early one, and it would work OK with the master cylinder. The drums are the same for both systems.
 

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Discussion Starter #5
Hi all,

FYI

Yes , 1900css front brake cilinders are 1 1/4 inch and 102 spider are 1 1/8 inch

I can use the 102 brake cilinders and do an overbore to 1 1/4 inch to fit in my 1900CSS

rgds Franco
 
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