laotsu Posted June 14, 2013 Report Share Posted June 14, 2013 doing a total overhaul of the brakes on my '71 521 and I ordered all new cylinders, flex lines, and a new master from Rock Auto. well I got two different rear cylinders under the same part # one is a 13/16 and the other is a 3/4 the part description calls them out as 13/16 which is what came off of the truck. I call Rock Auto and they send me a new part right away, gues what... it's another 3/4. So right now they are trying to figure out why they cant seem to send me another right sized cylinder and my truck is out of commission until I get the new parts. my question is, can I just install the 3/4 cylinders? What is the difference between the two? On a side note, what size are the stock hard lines and flare nuts in my truck? I have read elsewhere on here they are 3/8 but the flare nuts are larger more like 7/16 or 11 mm. do either of those sizes seem right? Quote Link to comment
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