How to test a dual feed master cylinder:
Note: This test will require a complete re-bleeding of the system due to the brake lines being removed.
•First remove the brake lines from the master cylinder ports. Then block off the master cylinder brake line ports using the correct size inverted flare plugs or bolts. Dual feed master cylinders may have ports on both sides that need to have all four out...lets plugged off.
•Note the protruding male cone of the inverted flare seat in the master cylinder port is made of a soft material and can easily be damaged.
•After all the ports have been plugged, apply constant pressure to the pedal, the pedal should be firm, and should not drop over time. If the pedal quickly becomes squishy there may be air in the master cylinder. You may need to bench bleed the master cylinder. If the pedal is firm and then drops over time under constant pressure, the master cylinder should be replaced.
Note: This test will require a complete re-bleeding of the system due to the brake lines being removed.
•First remove the brake lines from the master cylinder ports. Then block off the master cylinder brake line ports using the correct size inverted flare plugs or bolts. Dual feed master cylinders may have ports on both sides that need to have all four out...lets plugged off.
•Note the protruding male cone of the inverted flare seat in the master cylinder port is made of a soft material and can easily be damaged.
•After all the ports have been plugged, apply constant pressure to the pedal, the pedal should be firm, and should not drop over time. If the pedal quickly becomes squishy there may be air in the master cylinder. You may need to bench bleed the master cylinder. If the pedal is firm and then drops over time under constant pressure, the master cylinder should be replaced.
