Hydroboost conversion using Astro Van HB unit.

[grape of wrath]

Great write up! Can any master cyl. work on the h/b unit as long as it bolts up correctly? I understand the shaft diameter should be 1.0'' to 1.125'' but is the m/c any different between a h/b unit and a vacuum unit?

 

[Blazer406]

Great write up! Can any master cyl. work on the h/b unit as long as it bolts up correctly? I understand the shaft diameter should be 1.0'' to 1.125'' but is the m/c any different between a h/b unit and a vacuum unit?

Lots of different m/c's will work.... just make sure the piston is the correct size.... and it helps if the line size has the right threads..... or you'll need adaptors.....

 

[LSJM1]

so whats the size of the piston of a vacuum brake g-body master cylinder
Also do think you can use a vacuum brake pedal instead of a powermaster one