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seankenyon wrote:Peter,
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Sorry to sound daft but this is new to me
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- is it the case that both threads
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(1 on the hose and the 1 on the union) are metric but one end of the adapter I've bought isn't?
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Correct.
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Your brake pipe unions are M10x1, i.e.
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10mm diameter and 1mm pitch.
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Obviously, both the make and female threads will be the same ensuring a perfect fit.
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To use some form of adaptor that joins to both the male and female ends of your joint, you'll need matching M10x1mm threads on both sides of the adaptor which you don't have.
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One side of your adaptor is M10x1mm which is correct.
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The other is BSP
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(British Standard Pipe), which is a totally different imperial thread.
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What you need, not that you'll find it it, is a M10x1mm on both sides of the adaptor.
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FWIW, i have experienced the same problem as you when fitting aftermarket hoses to Mk1s.
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In each case i have made new short lengths of pipe, about 12" long, used a full length male M10x1mm adaptor on the end, and a simple male/female pipe joiner from old to new.
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