Difference between Hydroboost units?

[CMars45000]

Originally Posted by Bigdav160

I have an Astro unit installed on my truck. I did notice that the accumulator is twice as long on a newer Suburban in the shop.

My guess is that it allows more power applications of the brakes without
hydraulic pressure in an emergency.

That's a valid point. I hadn't thought about that. I ended up getting an entire setup from a 2008 Silverado HD. My concern now is that Mater cylinder bore might be too large for D52 style calipers in my application.

The Master bore is 37mm (1.45"). Wouldn't this yield a very stiff pedal, all other things being equal?