Master cylinder for vehicle brake system, has main piston guide and seal cup for sealing main pressure chamber, coaxially press-fitted in bore of housing cap

摘要

The master cylinder comprises housing cap (12) screwed into seal cylinder chamber. A main piston (31) and an auxiliary piston (32) are coaxially slidably arranged in the stepped bore (12c) of the cap. The guide bush (26) of main piston and seal cup (24) for sealing main pressure chamber (R1) formed between the two pistons are coaxially press-fitted in the bore of the cap.