OEM 2000 GMC Safari Brake Master Cylinder

2000 GMC Safari Brake Master Cylinder Parts and Q&A

• Q: How to properly bench bleed a Brake Master Cylinder before installation on 2000 GMC Safari?

  A: Draining air from the Brake Master Cylinder through bench bleeding saves time during the brake hydraulic system bleeding process. Set the master cylinder in a vise with slight tilt from the front and connect the ports to the vacuum source. Progressively push the primary Piston 25 mm as air escapes by using a round tool on the cylinder reservoir filled with new brake fluid. Refit the master cylinder into the vise with an opposite tilt and restore the same Piston stroke twice. Fill the reservoir with fluid and put the master cylinder into the vise with an even base. Take the outlet port plugs loose one by one and push the Piston toward the bore to remove trapped air. Seal the plug again before letting the Piston return naturally because air can enter the cylinder if left open. After filling the reservoir with fresh fluid put the master cylinder in place and continue the simple brake bleeding procedures.