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1. 

   Joined: Feb 25, 2018
   Posts: 130

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   Hotrodjohn71

   What was the purpose of the residual pressure valves in the output ports on the drum brake master cylinders on late 60s GM cars?

    

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   Hotrodjohn71, Jan 18, 2023

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2. 

   Joined: Mar 2, 2001
   Posts: 19,565

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   Tim

   Member

   from KCMO

   One less part to bolt on? Just the same as any other residual valve. Just packaged different

    

   Tim, Jan 18, 2023

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3. 

   Joined: Dec 3, 2009
   Posts: 14,026

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   Johnny Gee

   Member

   from Downey, Ca

   Basic’s, to keep cups at the wheel cylinder expanded at all times.

    

   Johnny Gee, Jan 18, 2023

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