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Old 01-13-2018, 09:43 PM   #2
Bigdav160
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Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
Re: Need new brake boster

Theoretically 4 wheel drums doesn't need power assist. But a K20 is a fairly heavy vehicle so I can understand that it could use some help.

With vacuum assist, more power, is all about the diameter and the number of diaphragms. Larger is more powerful.

Hydraulic power assist if even more powerful.

That's why I put hydraboost on my K20 Suburban
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