How do you get both cylinders to go in brake on 82 Datsun?

To get both cylinders to engage the brakes on an '82 Datsun, first ensure the brake fluid level is sufficient and that there are no leaks in the system. Then, bleed the brake lines starting from the farthest wheel from the master cylinder to the closest, ensuring that air bubbles are removed. Check the brake hoses and lines for blockages or damage, and inspect the brake components themselves for wear or malfunction. Finally, ensure the master cylinder is functioning properly, as it controls the flow of brake fluid to both cylinders.