Cleaning & Inspection
Clean all parts in alcohol and inspect for wear or damage. Master cylinder bore diameter is .812" (20.64 mm) on 318i; .938" (23.81 mm) on 528e, 535i and 635CSi; and .875" (22.23 mm) on 735i.
NOTE:
Cylinders with surface defects in bores must be replaced. DO NOT overhaul.