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[GMCnet] P30 or Stock master brake cylinder [message #337960] Wed, 17 October 2018 20:04 Go to previous message
BobDunahugh is currently offline  BobDunahugh   United States
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Senior Member
I just installed 80 MM calipers at the front. Have had 74 MM at the middle for 2 years. With stock drums at the rear. Worked well. Now with my change to 80MM at the front. Some say that the stock master cylinder is fine. Others say that the P30 is needed. I still have the P30, and bracket from the burned 78 Royale. Bob Dunahugh 78 Royale
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