Hydraulic Brake System Lock 1/8NPT Manual Brake Line Lock Pressure Hold for Disc Drum, New Brake Lock Line Lock, Hydraulic Brake Parking Lock Pressure Holder. Features: This brake lock uses hydraulic line pressure to hold your brakes. Adopted materials that meet strict requirements, high reliability. Professional manufacturing, high precision and stable performance. Application: Universal. Suitable for cars, trucks, disc or drum brakes. Specification: Condition: Material: Made of high quality aluminum. Size: As shown in the picture Package weight: Approx. 180g Installation: Suitable for cars, trucks, disc or drum brakes. Operation: 1) Press the brakes. 2) Press the brake lock knob. 3) Release the brake foot and it is locked. 4) To release the lock, press the brake foot and it will automatically open. Installation: 1) Use the two holes to fix the brake lock where it is properly. 2) Inlet port (1/8" NPT): Connect to the master brake cylinder, also comes with a 3/16" brake line fitting, you can choose to use the fitting or not. 3) Output port (1/8" NPT): Connect to the rear brakes. , also comes with a 3/16" brake line fitting., you can choose to use the fitting or not. Package includes: 1 x Brake Lock Note: 1. It CANNOT be used for unscheduled, emergency or long-term braking. 2. Please allow 0.5-1 inch difference due to manual measurement. (1 inch = 2.54 cm) 3. The color of the actual items may be slightly different from the listing images due to different computer screen, thanks for your understanding. NO installation instructions are included and professional installation is recommended. All items are brand new unless otherwise stated in the listing. We sell DIY (Do It Yourself) items with a few exceptions. We are not responsible for teaching you how to install. Professional installation is strongly recommended.