Do I Need To Bench Bleed The M/c Before Install?

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
Hello, Is bench bleeding a new master cylinder always a must?. The reason I ask is I have a complete new brake system to fill. The system is in a 65 impala dual master with proportioning valve, no antilock system.
thanks jim

no! get a buddy or the wife to help, just mount the master cylinder, correctly in the car, fill the master cylinder reservoir brake fluid level and then open the rear right (PASS SIDE)brake slave cylinder and bleed that one ,until you get no air in the fluid, while keeping a careful eye on the master cylinder reservoir brake fluid level, do the rear left (DRIVERS SIDE)next, pass front ,then driver front, always keeping a careful eye on the master cylinder reservoir brake fluid level.
done in this order you flush air out of the hydraulic lines more efficiently
 
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