Al Downs Posted April 29, 2015 Report Share Posted April 29, 2015 I haven't been able to find the correct brake fluid on this site or the manuals I have. Can someone please inform me? Thanks Link to comment Share on other sites More sharing options...
Doug G. Posted April 29, 2015 Report Share Posted April 29, 2015 I believe I got mine from CPS. Link to comment Share on other sites More sharing options...
Al Downs Posted April 29, 2015 Author Report Share Posted April 29, 2015 I am guessing many for the vendors have it but I don't know which type it is. I know there is a difference in them and don't want to use the wrong one. Link to comment Share on other sites More sharing options...
Doug G. Posted April 29, 2015 Report Share Posted April 29, 2015 Aeroshell Fluid 41 MIL-H-5606 Brake Fluid From page 1-10 of the FD maintenance manual. I realized after I answered you were asking a different question. Link to comment Share on other sites More sharing options...
Anticept Posted April 29, 2015 Report Share Posted April 29, 2015 5606, known as "red oil" because it's red, is used. It's a petroleum based hydraulic fluid. Based on milspec MIL-H-5606. You can use any 5606 spec red oil, they are chemically compatible. The other two hydraulic fluids (NOT TO BE USED IN CTs) are green and purple color. Green is vegitable base, purple is phosphate ester based. Link to comment Share on other sites More sharing options...
Doug G. Posted April 29, 2015 Report Share Posted April 29, 2015 Neither is Dexron approved, which is red and was sold to me by CPS. Link to comment Share on other sites More sharing options...
Doug Hereford Posted April 30, 2015 Report Share Posted April 30, 2015 There is another type of "Red" fluid. MIL-PRF- 83282. This fluid is completely compatible with MIL-H-5606. It also has the advantage of being fire resistant. If given a choice, I would recommend its use over 5606. A common trade label for this fluid is Royco 782. Its one draw-back is viscocity performance at very low temps. That being said, it is still in common use in the corporate aircraft fleets such as Citation 650, and Falcon aircraft, so it must do pretty well at altitude (cold soak). Doug Hereford Link to comment Share on other sites More sharing options...
Rich Posted April 30, 2015 Report Share Posted April 30, 2015 Good morning, Although I don't own a CT, when my brake cylinders were changed, DOT 5 was used. Previous DOT 4 was removed. The DOT 5 has the advantage of being a pure synthetic and will not harm the paint on your AC. It's also very high temp fluid and from what I've heard, it reduces brake fading. Light purple in color. Link to comment Share on other sites More sharing options...
Roger Lee Posted April 30, 2015 Report Share Posted April 30, 2015 DOT 3, DOT 4, and DOT 5.1 brake fluids are glycol-based compounds that are compatible with one another. On the other hand, DOT 5 brake fluid is silicone-based and should never be mixed with any other type of brake fluid. DOT 3, DOT 4, and DOT 5.1 brake fluids will damage painted surfaces. DOT 3 and DOT 4 fluids have lower boiling temperatures than DOT 5 and DOT 5.1. Furthermore, DOT 3, DOT 4, and DOT 5.1 fluids are hygroscopic--they absorb moisture from the air. This causes the fluid to turn dark, indicating that it is time for the brake fluid to be replaced. DOT 5 fluid will not damage paint, has a boiling temperature in excess of 500 degrees F, and is not hygroscopic. Link to comment Share on other sites More sharing options...
Tom Baker Posted April 30, 2015 Report Share Posted April 30, 2015 Asking what kind of fluid to use is a good thing. If you use the wrong type of fluid it can ruin the seals in your brake system. I have seen this first hand with owners thinking brake fluid is brake fluid and adding automotive brake fluid to a aircraft that uses MIL-5606. Link to comment Share on other sites More sharing options...
Anticept Posted May 1, 2015 Report Share Posted May 1, 2015 There is another type of "Red" fluid. MIL-PRF- 83282. This fluid is completely compatible with MIL-H-5606. It also has the advantage of being fire resistant. If given a choice, I would recommend its use over 5606. A common trade label for this fluid is Royco 782. Its one draw-back is viscocity performance at very low temps. That being said, it is still in common use in the corporate aircraft fleets such as Citation 650, and Falcon aircraft, so it must do pretty well at altitude (cold soak). Doug Hereford apparently there is another slew of red oil spec to fix the low viscocity and other various problems. It's freaking crazy how many red oils are out there are and I had no idea... http://www.shell.com/content/dam/shell/static/aviation/downloads/AeroShell-Book/aeroshell-book-6hydraulics.pdf Link to comment Share on other sites More sharing options...
Doug Hereford Posted May 1, 2015 Report Share Posted May 1, 2015 Anticept, Yes there are numerous other fluids. However, none of them are approved in the U.S. as far as I know. 83282 has been in use for a long time. I think there might be one other fluid that is approved as an alternate for it (MIL-PRF-87257). Either way, 83282 would be my hydrocarbon fluid of choice. Unfortunately, in the standard world, switching from 5606 to 83282 would probably still require additional FAA approval (STC or Field approval). There are several aircraft I know of that have recurring AD's against them for brake fires (Cirrus SR20/22) etc...... Switching to this type of fluid would possibly be an AMOC to terminate these AD's. As for SLSA, I would think that MFG authorization is required, but should be easy to get. If you are experimental, and using 5606, I would recommend switching to 83282 whenever is convenient. I looked it up on Aviall.com. My cost is less then $8/qt. Doug Hereford Link to comment Share on other sites More sharing options...
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