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The big rubber plug is to allow access to the bolts and fittings attaching the cylinders to the pedal box frame. A good "trick" is to "Heli-Coil" the cylinder thru-holes while they're out. Next time it will not require the "gymnastics" it usually takes.
To treat the cleaned up area (down to bare metal, rust removed) use POR-15 or another "rust converter" first, then paint the area .
To treat the cleaned up area (down to bare metal, rust removed) use POR-15 or another "rust converter" first, then paint the area .