Hi,
Can anyone confirm what the rear brake cylinder diameter is for a Mk2 Escort? Both Gregory's and Ford manuals say 17.8mm, but some on-line part catalogs say 19.05mm, such as Burton's for the RS2000. I'm of course leaning to the 17.8mm, but have a nagging suspicion about whether it is actually correct, so I thought I'd check here first.
Thanks.

Mk2 Escort microfiche parts list shows
1.3  20.6mm  74EB 2261 AA
1.6  17.7mm  75AB 2261 BA
2.0  19.0mm  75AB 2261 AA

Aus. Mk2's, including RS2000, are 3/4" (19.05mm). 
I put 13/16" (20.64mm) in my Mk2. They were new PBR cylinders listed for a 1975/76 1.3L model.
That gives 17% more piston area!

Do The RS version Have bigger diameter rear brake Drums than the standard Mk 2, hence the bigger cylinders?

NQRS
Do The RS version Have bigger diameter rear brake Drums than the standard Mk 2, hence the bigger cylinders?

Aus. RS2000's have the same rear cylinders & drums as the standard 2L.
My previous post should have said "Aus. 2Litre Mk2's, including RS2000's, are 3/4" (19.05mm)
I don't know about the 1.6 Mk2.
 

So even Ford is inconsistent (between their repair manual and the microfiche). I also thought all Mk2s used the same diff and rear brakes; at least by mid-77 when the 2000cc engines were added to the range. No wonder I'm confused.

Protex Australia catalogues are usually reliable: http://www.protexparts.com.au/catalogue/ & shows:
 
MK11 rear cyls - 17.85mm for all 1.6L, & 19.05mm for all 2L