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As getting reliable Hydrovac parts is dicey and Hydrovac brakes in my case have proven too weak, I want to replace with a hydroboost system.
Repairing a 1972 C600 with the Hydrovac unit behind the rear axle. Had the hydro replaced 20 yrs ago, it was only good for 3 years and last time I drove it I had to use the park brake to stop it. Not gonna do that again.