Based on our shop experience specializing in heavy-duty brakes since 1985:

• Bench Bleeding: Never skip bench bleeding the master cylinder assembly on a vice before mounting to the firewall or booster face. Trapped air pockets inside the cast iron bores create persistent spongey pedal issues.
• Pushrod Depth: Always verify piston cup depth against your existing brake pedal pushrod length to ensure full travel range before final hydraulic hard-line torque sequences.
• Fluid Compatibility: Use clean DOT 3 or DOT 4 brake fluid only.