Can you help me ID this model brake caliper?
...as fitted on the rear of Brabham BT29 racecars (~1969). The shape of the casting appears very different from Girling's "NR" model (no provision for parking brake!) and it's smaller than the "AR" calipers Brabham used at the front of these cars (plus AR calipers feature an external pipe between inboard and outboard halves). I've failed to get a real good photo of the inboard side of this model caliper. Perhaps these shots of various other Brabhams might help:
Here's one more... is it the same model except with a different cap?
Aluminum or magnesium? Piston diameter?