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P30 chassis brakes Greg Beard 10-25-10  
I have 97 Holiday Rambler Vacationer. The brakes have gone out on me 2 times on steep down hill sections. I know that the fluid is getting hot and vaporizing. I have tried changing the fluid with same results. My question is can I change to a higher dot fluid, say 4,5, or 6 ? these come with higher boiling points and would help with the overheating fluid. I just don't know which are compatible. thanks for any help.
Re: P30 chassis brakes BUBBA THE BUS TECH 10-25-10  
That is a dificult up grade to pull off, these fluids tend not to be compatable.
Also if you brake fluid boils and is new your brakes should be litterally smoking hot. I think you would notice that the brakes were hot enough to roll smoke and stink going down a hill, that is how hot they would need to be to boil fresh fluid. They would also be ruined when you finally stopped.
This is called "FADE". This is where the linings get hot enough that the lining surfadce that contacts the drum or rotor flashes to liquid and quits working.
The way to tell is does the brake peddle go to the floor and recover later? Yes = boiled fluid. No = Fade.

Get your local fast lube to check your brake fluid for contamination. Good ones have a little device they dip in the fluid and can tell the water content.
Getting all the contamination out can be a ereal pain and I have had to vehicles three times to get it done correctly.
By the way, fade or boiling good-ish fluid means you are asking too much of your brakes, slower down hills, hold it by manually shifting to lower gears etc.
Good Luck
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