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I'd use DOT3. Its what ford designed the system to use. DOT4 absorbs water much quicker. In my offroad buggy I run DOT4, and have to change the fluid every 12 months. I can test the fluid and it will show 3% water in that time. In my support vehicle (an E SuperDuty box van) I can show 1% water in the same timeframe.
DOT4 has a higher boiling point, and if you change the fluid yearly would probably hold up better under extreme heat conditions such as racing, downhill decents, etc. If you are like, say, 3/4s of the vehicles on the road, you should probably use DOT3 for its maintenance interval.
Have often read that DOT4 brake fluid absorbs water more slowly than DOT3, extending its service life. Water absorption doesn't reduce DOT4's higher boiling points to the lower temps seen in DOT3.
Originally Posted by 95e150CW
I'd use DOT3. Its what ford designed the system to use. DOT4 absorbs water much quicker.
If I was doing front brakes & "the rear brakes and a full brake system bleed-out" the 1st thing I'd do would be to draw all the old fluid out of MC & fill w/fresh DOT4.
The gov't specs & companies that make brake fluid claim DOT4 is superior to DOT3. Castrol, among others, recommends DOT4 for "ford designed" vehicles. Castrol's recommendation is not "Ford only".
Just changed my master cyl BF last week end, Valvoline synthetic DOT3/4 for all ABS systems. Pulled a full 16oz out of the P/S res while I was there.....once a year and your parts last forever.
PST I'll be interested in following your experience with those rotors and pads----seem to be an interesting combination. I like the idea of those grooves, assume its to channel water away---good idea. Their longevity as compared to the more standard type, whether they warp under hard braking is something to watch.
Love those new wheels---gonna be a bit tough to keep 'em looking as bright and shiny as the catalog photos show though! I've toyed with the idea of finding a gently used set of the factory allows but shudder to think of the constant cleaning they typically need to stay great looking.
As far as the fluid I'd second 95E150's suggestion and go with Ford's original recommendation to your vehicle's years, DOT 3 in your case.
I am currently installing line lock and upgrading to stainless steel braided hoses on my Mustang this weekend. Once done I am doing the rears on my E and will take pics of the fronts as I should have 1000 miles on by then.
PST I'll be interested in following your experience with those rotors and pads----seem to be an interesting combination. I like the idea of those grooves, assume its to channel water away---good idea. Their longevity as compared to the more standard type, whether they warp under hard braking is something to watch.
Love those new wheels---gonna be a bit tough to keep 'em looking as bright and shiny as the catalog photos show though! I've toyed with the idea of finding a gently used set of the factory allows but shudder to think of the constant cleaning they typically need to stay great looking.
As far as the fluid I'd second 95E150's suggestion and go with Ford's original recommendation to your vehicle's years, DOT 3 in your case.
Keep us up to date on those rotors and pads!
The slots allow gasses generated by the pad to escape, theoretically improving braking performance under very very extreme braking conditions. I've never seen that particular pattern before, most rotors have radial slots like the ones on my SRT8:
The machine finish on those pictured rotors seems to be awfully smooth. I usually expect to see crosshatching from a grindstone truing the rotor as the final production step (usually even after paint/epoxy...)
I would bed those rotors, particularly if you used very heavy duty pads. Get the rotors hot, until you get a light brake smell, with repeating braking. Then drive without touching the brakes (i use a highway) for a few miles to let the brakes cool. When done, the rotors should have a light grey-ish tinge to them. That's transferred material, meaning those super ultra heavy duty pads can start to do their job. More info from a very respect brake specialist here: Instructions for bedding in your brakes
Heavy duty pads don't brake too well unless they are warm. Hawk actually recommends that their superduty pads, for example, not be used unless you are very near your GCWR all the time.
The rotors got their first test today after a major panic stop after being distracted by a very nice boat and not noticing a car stopped ahead of me for no real reason.
All worked really well. Stopped with space to spare. Peeled wife off of dash.
I am a little late on posting but here is the reason for replacing my rims, cracked! Not sure how but suspect driving into a cabin on very cold winter day.
Here are the new Eagle rims mounted!
Only thing left to do is rear brakes and interior clean-up and back to great condition again.