68 Front Line Size

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Old September 21st, 2017 | 05:28 AM
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TheBigBlueBoat's Avatar
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68 Front Line Size

What is the line and fitting size for a 1968 Cutlass with drum brakes, front line between the proportioning valve and front right wheel cylinder? I'm assuming it's the standard 3/16" line, but if anyone could confirm that would be great. Thanks.
Old September 21st, 2017 | 05:36 AM
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Front lines are 3/16"
Line from M/C to dist block to rear axle is 1/4"
Lines from rear axle tee fitting to rear wheels are 3/16"

The flare nuts vary in thread size based on location. This was done to prevent improper connections on the assembly line. The repro line vendors all sell these non-standard flare nuts.
Old September 21st, 2017 | 06:53 AM
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That's what I thought. Are any of the other fittings oddball sizes, other than the MC fittings?


I suppose I can always try and use the fittings off the old line but it's always nicer to have a line complete to save on fluid loss and bleeding.
Old September 21st, 2017 | 06:57 AM
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Originally Posted by TheBigBlueBoat
That's what I thought. Are any of the other fittings oddball sizes, other than the MC fittings?
The distribution block/combo valve also used non-standard fittings.
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