Patent ID: 6381959
Filing Date: 2002-05-07
Classification: B60T

Abstract:
A brake master cylinder comprising:a cylinder body having a cylinder bore possessing an open rear end; a cap fixed to the cylinder body at an opening portion of the cylinder bore and forming a cylinder housing with the cylinder body, the cap including a bore; a first guide member coaxially positioned in the bore of the cap; a second guide member coaxially positioned in the cylinder bore and having a first bore at its front side and a second bore at its rear side; a sleeve having a rear end coaxially fitted into the bore of the cap and a front end coaxially fitted into the second bore of the second guide member, the sleeve having a front flange portion formed between the cap and the second guide member, and the front flange portion being held in the axial direction between the cap and the second guide member; a first piston fitted into the cylinder housing through the bore of the cap and being slidably supported in the axial direction by a bore of the first guide member and a bore of the sleeve; and a second piston located coaxially in front of the first piston and slidably supported in the axial direction by the first bore of the second guide member and the bore of the sleeve.