70 vs. 71 brake booster difference?

[HuggerCST]

I see that they have different part numbers. Does anyone know the difference? I'm switching my '70 power drum/drum to 71 style disc/drum. Can I simply change the master cylinder & prop valve, or do I need to change to the '71 style booster too?

[cparman]

I think Chevy used two different suppliers back in the day. If you can look it up on NAPA's site and see a picture you will see the difference in the two styles of booster. They also use a different master cylinder for each. Hope this helps

[myoldchevytruck]

Wynne,

Brake Booster from your 70' will work if your gonna change to the 71'-72' disks.

I have a 69' and I'm using the brake booster from it for the 71'-72' disk conversion (just did this conversion last weekend). I of course needed to change master cylinders and now use the proportional valve. Drum brakes use a smaller resiviour (sp) master cylinder and a distribution block. Note: brake line sizes are different also

[HuggerCST]

Thanks!