[Bhigdog]

I use it in all my old cars with no problems. It's been in my Vette for 20 years with no leaks or corrosion.................Bob

[oldwood]

I replaced all wheel cyls, mst cyl, rubber lines, and sprayed brake cleaner in the metal lines and cleared w/air and used .5. I never had a problem. This was on my '50 Buick Rivi.

[Hurst_Olds_1968]

Originally Posted by rocketguy

I have four wheel disc on my 442 and have used .5 for 12 years with no problems. It was basically a new system when I installed it though, and I would reccomend purging yours with something to rinse out the dot 3 if you do use dot 5. Dot 3 and .5 are not compatable liquids and will coagulate if put together.

The thing I 've read about .5 is that it does not absorb moisture. Therefore .5 will allow H2O to be a separate liquid in your brake system. If your brakes get REALLY hot, the H2O can then boil, introducing air into the system. This leads to a very undesireable situation. This is probably why OldsmoREO had the situation at high altitude. If you use .3, the H2O is absorbed into the fluid, therfore cannot boil under extreme heat.

Best of luck with your car!


.

Thank you, but my question is what do I run through first to purge the DOT 3????

Thanks again