Brake Master Cylinder/Servo Upgrade - Confusion

Hi,

I have read the very good guide

https://gbr01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fvwgolfmk1.org.uk%2Findex.php%3Fpage%3Dcedi%26type%3Dmisc%26id%3D28&data=05%7C02%7Cblumbers%40waveedu.org%7Cc98e08c49e4a4c43639c08dbfa21101b%7Caf7ba1179cdc441881bbd0f9780fe1ef%7C0%7C0%7C638378792126559429%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=IZ%2BHhL4KVOiMBuU2e%2BHmPXkJa%2FWxpHLdFjwJcmHHNys%3D&reserved=0

and dug out the Mk2 16v Brake upgrade kit I bought a year ago… my garage was fitting it today (along with EBC disks/Pads/New Bearings)… but the they hit a couple of issues not in the guide ( [1] I have sourced a new brake fluid reservoir) but [2] the original master cylinder has brake pressure sensors (I think) do these need to be kept as they were not on the upgraded master cylinder I bought.  I have included a photo.

Thanks for any help

Those aren't pressure sensors.  They are pressure regulators (proportional Valves)  so that rear drum brakes can't LOCK up under stomp it to the floor conditions.

Over here on this side of the pond, the valves are located on opposite locations of the MC on the Cabriolets that I drove.

yes they need to be in the rear brake lines

Thanks. Much appreciated as always