Would anyone know the internal diameter, or general hose needed to go from master cylinder to the top of the booster? It's a flexible hose and doesn't have any metal fittings on either end. It's secured by hose clips. Can't find the item in the repair manual and it's difficult to measure the internal diameter . This is for a 1973 XKE

 

also Moss:

https://mossmotors.com/xke-7825-brake-hydraulics-v-12

 

Not sure why this link didn't show up with other post:

https://www.sngbarratt.com/English(U...rake%20hose%60


SNGB generally has correct hoses. Tried 3 local auto parts stores for rubber connector hose for breather.. either too big or too small. SNG part fit perfectly. If you are online and logged in, use their chat. William or Jeremy know their stuff and can help you.

 

The pipe from master cylinder to the top of the booster should be 1/4" metal.