Maintaining a vehicle’s braking system is critical. The master cylinder supplies braking fluid to the brake lines. Before installing a new master cylinder, air must be bled off. Bench bleeding a master cylinder before installation removes air best.
Master Cylinder Understanding
Front and rear hydraulic circuits are in the master cylinder. Each circuit has a reservoir and works independently. Front and rear brakes are controlled by the master cylinder’s primary and secondary pistons. The brake pedal presses the main piston, which distributes brake fluid to the front brakes. The primary piston pulls the secondary piston, distributing brake fluid to the rear brakes.
Master Cylinder Bench Bleeding
Bench bleeding a master cylinder eliminates air from the system. Any auto parts store sells bench bleeding kits for master cylinders. Plastic hoses and fittings connect the master cylinder’s outputs to the kit.
Fill the master cylinder’s brake fluid reservoirs first. Secure the plastic hoses to the master cylinder’s outlets. Place the other end of the hoses in the reservoir, submerging them in braking fluid.
Push the master cylinder pistons using a screwdriver. Brake fluid will flow into the reservoir from the hoses. Push the pistons until the braking fluid is air-free. Bench bleeding requires that the hoses stay submerged in brake fluid.
After removing all air bubbles, remove the master cylinder outlets’ hoses and clean them. Install the master cylinder.
Conclusion
Bench bleeding a master cylinder is essential for proper brake operation. Bench bleeding kits make it simple and fast. Following the instructions above will guarantee your master cylinder is air bubble-free and ready for installation. Wear gloves and eye protection when handling brake fluid.