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You can find good and bad things about both systems. For my vehicles I will stick with vacuum. We have both systems in our fleet of thousands of vehicles. I have 600 vehicles assigned to my shop and only about 5% are hydraulic boost. Never seen any real failures with either system.
On some of the heavier units they have an electric hyd pump back up systems. When the hyd pressure from the power steering pump drops the electric system kicks in and keeps the pressure up in the brake booster, even with the engine completely off.
But with a half ton truck and everyday driving the vacuum booster works fine.
@68LSS1
Did you finish installing your diff?
How about some pics.
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