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Re: master cylinder swap
I wanted to upgrade to plastic aluminum unit on my 77, mainly because it seems like the plastic reservoirs seal up better and it would save some weight.
It turned out that all the aluminum ones were the stepped bore style for quick take up front brakes. From all the browsing I did through parts catalogs, it seems like they never made them for older trucks.
I would love to find an aluminum/plastic MC with a 1-1/8 bore that would fit the truck and work correctly but I haven't had any luck so far.
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1977 GMC Sierra Grande
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