Tip & How-To about Ford F-100

Brake Fluid misconceptions

I have come across several misconceptions concerning brake fluids. Unfortunately the brake fluids available to us are the inheritance of a by-gone age and we are stuck with the inferior Glycol-Ethyl based fluids because there is no practical way upgrade all the vehicles in the world to the far superior Silicone based fluids, and the two differnet based fluids are not compatible with each other.
Brake fluids need to comply to several stringent requirements, these have been upgrared over the years and are marked by their DOT ratings, most recently from DOT 3 to DOT 4, and the seldom seen DOT 5.1.
Here the main problem arises. DOT 4 supercedes DOT 3, (the older fluid is not meant to be used on older cars) and if you come across any, it is long past its Sell By Date.
The main difference between Dot 3 and Dot 4 is the boiling points of the fluids (which for obvious reasons have to be as high as possible). DOT 3 has a dry boiling point of 205 deg F. while DOT 4 has a dry boiling point of 230 deg F. With a mere 3.7% water added to the fluids DOT 3 boiling point drops to 140 deg F. and DOT 4 drops to 155 deg. F.
Basically, what it comes down to is that DOT 3 fluids should be phased out and removed from systems as soon as possible, even on older and vintage and veteran vehicles and replaced with DOT 4 fluid.
Strictly speaking, if normal maintenance routines are followed, there should not be any DOT 3 equiped vehicles on the roads anymore.

More about this in a following tip.

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1 Answer

Yellow leak in the snow - same colour as brake fluid


Hi Julie, I don't know if you ever found a solution to your answer, but the same thing happened to me this year with my Toyota Camry. I ruled out transmission fluid and Toyota coolant because both are red. Oil is typically brownish to dark brown - depending on your oil change cycle. I ruled out anything from an animal, because it didn't have that type of odor. So, I did some research and came across an excellent Toyota forum web-site that sounds EXTREMELY reliable concerning this problem. (I also bounced this question off of my brother-in-law who lives in Maine and sure enough, he's seen the same problem under his vehicles. btw: I believe most people don't notice this issue because they typically get into their vehicle, start it and take off. It's a sight that goes unnoticed by most people. But, when you do notice - perhaps moving the car a little and getting out - it causes concern because you "think" your vehicle is leaking some fluid.) I'm quite sure this response will help many others!!! And, this problem is not limited to Toyota's either, although it may be more typical with older vehicles that have been subjected to time, weather, salt, etc: http://yellowstainsonsnow.blogspot.com

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1 Answer

Rear brake caliper won't slide across to allow movement to put in new pads. One side no worries other no way? Any ideas. Lexus es 300 2005!


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Hi!

YES! You should be very concerned. The breaking fluid must never leak. It can happen anytime that the car loses all breaking power, by leaking more fluid and by air entering the system. Please let a professional check and repair that breaksystem.

Best regards!

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