DOT 5 vs 5.1? What are you using?

[Zeus51]

Thanks for the information! This has been extremely helpful! Does anyone have a good location to buy the proportioning valve for the M1008? I have read in other threads that it is the PV2 proportioning valve. Is this correct? I know the GM parts codes are either 18008085 or 1257203. Could the link below be the correct one?


https://www.carolinaclassictrucks.com/172-1353-brake-valve.html