My truck also has the Bendix 374000 and did not have a reservoir from the factory. The plumbing is as you have stated, master cylinder to Hydrovac to tee to wheels.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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