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About a year ago I installed an Astro van h.boost unit in my dent. It was a j/y $40 unit, and now I am taking it out to rebuild it. I will be takiing pix of the rebuild, if anyone is interested. I'll also be showing how the install was done, giving parts #s and prices.
The unit brought the braking into the next millenium. It is a 'great' upgrade. I mean, I suddenly come over a hill at 70 mpg and see cars stopped ahead, I don't even worry. The brakes are killer with the h.boost. But, the j/y booster failed.
I would love to know how you did it I have a 79 250 with a bad master cylinder and instead of having new master cylinder and same old weak breaks why not upgrade. Thanks, Matt.