Part Number: 3961-07000042
Notes: Master Cylinder -- Remanufactured; Supplied w/ Reservoir; with Brake Code JB7; GM Brake Codes are on the "Service Parts Identification" sticker.
- Designed to render exceptional performance
- Converts physical pressure into hydraulic pressure to operate other devices in the system
- Functions when the brake pedal is depressed
- Facilitates easy installation
- Backed by a limited lifetime warranty