I think you will throw good money after bad chasing the vacuum route as there are limits to how much vacuum you can pull and the differential between what the nissan pump is delivering and what an electric pump will pull are very small. What @Rossco says the hydraboost setup is the way to go as you double the braking force minimum. I am going this path once I get my beast back on the road. I have not gone the GU route, more the EFI twin pad calipers, larger disks, upgraded softer pads, braided lines. the braid made the biggest difference to be honest and I am sure got me thru the brake test when going thru engineering. Yes, my barge is heavy also.






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