2014 GC DOT 5.1 Brake Fluid - Jeep Garage - Jeep Forum

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  #1  
Old 12-10-2015, 07:32 PM
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2014 GC DOT 5.1 Brake Fluid

I have a question concerning Brake fluid on a 2014 Grand Cherokee 4x4 V8 with the HD brakes. I am asking this question for a friend of mine that is soon going to be towing at the 7200 lb limit in very harsh mountainous areas. He is at around 60,000 miles and doing brake pads and going to also bleed the brakes while changing pads and replace the brake fluid with the best available.

The owners manual calls for DOT 3 or 4 brake fluid. DOT 3, DOT 4 and DOT 5.1 are all polyethylene glycol-based fluid with DOT 5.1 having the highest boiling point followed by DOT 4 and DOT 3 with the lowest. DOT 5 is a different type of fluid that is silicone based and more geared towards racing and does not mix with DOT 3, DOT 4 or DOT 5.1. DOT 3, DOT 4 and DOT 5.1 can be mixed together. DOT 5.1 does meet the mopar requested SAE J 1703 spec and in addition the SAE J 1704 spec. DOT 5.1 increases the dry boiling point 100 F degrees and the wet boiling point 72 F degrees over DOT 3.

So even though the owners manual does not specifically call out DOT 5.1 use, from everything I have found it should be compatible and provide better performance. In the severe conditions he will be operating in the higher boiling points of the DOT 5.1 will be of value to him.

So the question, has anyone used DOT 5.1 brake fluid in their Grand Cherokees? or is anyone aware of any reason why DOT 5.1 would not be good to use in the Grand Cherokee? Thanks, appreciate anyone's thoughts on this.

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Old 12-10-2015, 07:49 PM
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Re: 2014 GC DOT 5.1 Brake Fluid

I would run a DOT 4 brake fluid from a reputable racing brand: I have used ATE Super Blue DOT 4 for the past 10 years. Now, post ban, you need to get the ATE Type 200 which is Amber in color but same quality juice as the blue dyed one.

A DOT 5.1 of choice would be Motul RBF 600 but I personally never used it. But ATE Super Blue is fantastic. I will use that (amber) in my Jeep. It is Tail of The Dragon verified :-)
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Old 12-10-2015, 09:07 PM
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Re: 2014 GC DOT 5.1 Brake Fluid

I have always used DOT 4 personally also but I understand my friends need and wanting to put the best possible in as long as it is compatible and without any negatives. I had been looking at MOTUL 5.1 and it does indicate compatible with DOT 3 and DOT 4. I cant find or see any reason not to run 100% 5.1 just appears to be a better version meeting a tighter spec than 3 or 4. For brake fluid running DOT 3, DOT 4 and DOT 5.1 seems to be a similar comparison for oil as running standard Dino oil, Synthetic oil or Advanced Full Synthetic oil. May just shoot MOTUL an email and get their thought
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Old 12-11-2015, 01:01 PM
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Re: 2014 GC DOT 5.1 Brake Fluid

I have not used 5.1 in any of my cars, but used to use it in the race bike. As technology progressed, I changed to other fluids. I'm not so sure there would be much benefit in the GC. If the fluid got hot enough to approach the boiling point, pads and rotors would probably be hot enough to damage them over time.
Wet boiling point is really the number to pay attention to. There are several DOT4 fluids out there that have a WBP in excess of the DOT5.1 minimum requirement. They also cost less. I currently use Amsoil Series 600 DOT4 in everything. The WBP is around the 380*f mark.
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Old 12-11-2015, 05:41 PM
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Re: 2014 GC DOT 5.1 Brake Fluid

Quote:
Originally Posted by The Evil Twin View Post
I have not used 5.1 in any of my cars, but used to use it in the race bike. As technology progressed, I changed to other fluids. I'm not so sure there would be much benefit in the GC. If the fluid got hot enough to approach the boiling point, pads and rotors would probably be hot enough to damage them over time.
Wet boiling point is really the number to pay attention to. There are several DOT4 fluids out there that have a WBP in excess of the DOT5.1 minimum requirement. They also cost less. I currently use Amsoil Series 600 DOT4 in everything. The WBP is around the 380*f mark.
ah ok I see now, so the reason why the DOT4s with the WBPs higher than the 5.1 standard are not actually rated 5.1 is that they don't meet the viscosity spec for 5.1 in ultra cold temperatures which doesn't really matter anyway. So bottom line is like you guys said a DOT 4 600 Amsoil or Motul would be the best performer for extreme conditions. Unless you happen to be driving in the Artic Circle then the 5.1 may offer some benefit. Thanks!
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