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Canadian Poncho Homepage -> Canadian Poncho -> Beaumont Power Train Tech Forum -> Power Drum brake master cylinder question...
Post Info TOPIC: Power Drum brake master cylinder question...
66 327 sd


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Power Drum brake master cylinder question...
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I'm hoping for a quick fix to a brake problem to keep me going/stopping until I revisit my entire braking system in the fall. As such I looking to quickly replace my existing factory single reservoir master cylinder. Apparently I need to know if I require a 7/8" or 1" bore.  Huh?...  I now have the old unit off, what should I be measuring?

thx!



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r66sd


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Hi Geoff

I am having a similar problem right now as well. My master cylinder is slowly leaking fluid down the front of the booster, and the booster apparently has a small vacuum leak. Need to replace both. We both have have 66 SD with the 327 so if you find out the proper replacement products, please let me know what #s,and where to get them. KMS had a disc kit on sale in the spring, and they are not to expensive even when not on sale. I heard the kits are all made in China anyways.



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66 327 sd


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I think I figured it out. Will post a pic later..


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66 327 sd


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I believe this tells me that the current master cylinder is a 1" bore...

 

IMG_7361.JPG

IMG_7363.JPG



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66 327 sd


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Once I've done the change and confirmed the part is a fit, I'll post the part number...

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r66sd


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66 327 sd wrote:

Once I've done the change and confirmed the part is a fit, I'll post the part number...

 Thanks Geoff



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66 327 sd


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I'll hopefully be working on it tomorrow. As i have zero knowledge of this stuff, just looking at how it all goes together I currently can't help but think either of the 7/8" or 1" options should work albeit with the larger one possibly moving more fluid resulting in perhaps a more "touchy" pedal than the other? Hopefully someone can explain why they might not be interchangeable....

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66 327 sd


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Thinking that the 1" would move move fluid and therefore would require more foot pressure. Therefore 1" is probably for power assist brakes and 7/8" for non power assist. (Just a guess though.)

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sixtyeightSD


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The manual drums on our 68 you have to stand on them in the driveway.cant imagine on the road.
Got a disc brake kit with the car definitely going that route.

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