caliper questions on 87 4kq

[Doug Hill]

It is that time again, time to do the rear brakes on my 87 4kq. Only this 
time some of my tools are missing (like my larger alan wrench set) does any 
one know what size the alan wrench is for compressing the rear calipers on 
my car. I think it might be a 17mm but I might be wrong. I need to go buy 
one before i start so anyhelp would be appreciated.
TIA
Doug Hill
87 4k cs quattro

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