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Old 08-20-2006, 10:02 AM   #1
Don W
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HD brake fluid?

I picked up my new 06 Nightrod yesterday. Of course it was pouring rain, but none the less, it was a great experience!! Rode my first 80 miles, mostly back roads. All I can say is I wish I could live on that bike.

Point of interest for me. My last Harley was a 1985 Sportster. I remembered that it called for DOT5 brake fluid. My v rod manual calls for DOT4 fluid. Was this spec changed for all Harley's, or just vrod?

Sun's out!! Time to ride. Be safe.
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Old 08-20-2006, 12:53 PM   #2
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They changed to DOT 4 last year or the year before. Go with what it says on the master cylinder covers and in the manual. DOT 4 is the fluid for you.
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Old 08-20-2006, 02:07 PM   #3
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Thanks for the info, Larry
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Old 08-21-2006, 09:20 AM   #4
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after all the info I have gotten from everyone else, it is a pleasure to pass some along
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Old 11-30-2007, 06:17 PM   #5
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Does anybody know if DOT 5 will work instead of DOT 4? DOT 5 wont eat paint.
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Old 11-30-2007, 06:33 PM   #6
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only if dot 4 has not been put in te system and all the lines and MC and calipers are new... mixed I heard they form clumps
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Old 12-02-2007, 10:46 PM   #7
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The piston seals on the calipers will be attacked by silicone brake fluid, the materials are incompatible. All brake systems absorb water. Dot 3/4 have anti-corrosion additives that absorb water in the system so it doesn't corrode things. Over time moisture uses up these additives so fluid changes must be part of routine maintenance. Dot 5 silicone fluids do not mix with water. Water that enters the system stays separate and drops to the lowest point in the system. Once there it will attract any dirt in the system, eventually forming a ball of fung that can clog orifices. The water also kills brake feel, water gives the brakes a spongy feel. Since the water is not absorbed in Dot 5, any water in the system will boil at 100 degrees C or 212 F regardless of the boiling point of the fluid. You can get vapor bubbles and even a vapor lock when using the brakes hard for a prolonged period of time unless the fluid is absolutely moisture free, which is why you never see silicone brake fluids used in performance cars or bikes or in racing. Dot 4 does not suffer this problem. Both suffer degraded boiling points with age, but Dot 4 does not allow water to separate out and boil off on it's own.
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Old 12-03-2007, 10:14 AM   #8
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Quote:
Originally Posted by Philthy
The piston seals on the calipers will be attacked by silicone brake fluid, the materials are incompatible. All brake systems absorb water. Dot 3/4 have anti-corrosion additives that absorb water in the system so it doesn't corrode things. Over time moisture uses up these additives so fluid changes must be part of routine maintenance. Dot 5 silicone fluids do not mix with water. Water that enters the system stays separate and drops to the lowest point in the system. Once there it will attract any dirt in the system, eventually forming a ball of fung that can clog orifices. The water also kills brake feel, water gives the brakes a spongy feel. Since the water is not absorbed in Dot 5, any water in the system will boil at 100 degrees C or 212 F regardless of the boiling point of the fluid. You can get vapor bubbles and even a vapor lock when using the brakes hard for a prolonged period of time unless the fluid is absolutely moisture free, which is why you never see silicone brake fluids used in performance cars or bikes or in racing. Dot 4 does not suffer this problem. Both suffer degraded boiling points with age, but Dot 4 does not allow water to separate out and boil off on it's own.
First, DOT5 brake fluid doesn't attack the seals in any brake calipers currently being sold. This has been discussed several times on the forum. Max sent a letter to Brembo and the response he received was that Brembos should use DOT4 fluid only. This bothered me since I've used DOT5 fluid in several different brands of calipers and master cylinders, including Brembo, with no problems. I called Brembo North America (800-325-3994) and talked with Jason Hiliger on extension 238 (he handles motorsport applications including motorcycles) and he told me that he had also heard that DOT4 was recommended but was never told that DOT5 couldn't be used. He said that most Brembos are used in high performance applications and DOT4 is preferred because it provides a higher dry boiling point and has less affinity for air than DOT5 fluid. He was interested in hearing about my positive experience with DOT5 fluid in Brembos and said he would pass the information along. I didn't make a big issue of this since it wasn't really an endorsement but I would say that the answer you receive depends on who you talk to. I will say that I've never had a problem with degraded seals due to DOT5 fluids in any of several brands of brake components since the 1980's when I first started using it. I will also say you should never mix DOT3/4/5.1 with DOT5 and never use DOT5 in a system that previously used DOT4 without replacing all soft parts and completely cleaning all traces of DOT4 from wetted metal surfaces. Also, never use DOT5 in an ABS equipped brake system.

Second, your description of brake fluids is incorrect. The DOT 3/4/5.1 fluids are composed of various glycol esters and ethers that are hygroscopic by nature but they contain no "anti-corrosion additives". These types of fluid need to be replaced when the quantity of absorbed water degrades performance (at least every two years). I agree that DOT5 fluid doesn't absorb water and I agree that all DOT3/4/5.1 hydraulic systems absorb water but I don't agree that all brake systems absorb water. Water only enters a hydraulic system with DOT5 fluid when allowed to enter while servicing the fluid or in small amounts through the vent. This potential water contamination is why DOT5 fluid should be replaced at regular intervals just like DOT 3/4/5.1 fluid. It's also unlikely that the small amount of water that might enter DOT5 fluid would ever migrate to the region of the caliper where temperatures would cause it to boil.

I don't want to get into a big debate on which type of fluid is best, but if you're familiar with the difficulties of bleeding DOT5 and want to use it in a new, non-ABS brake system that hasn't been contaminated with DOT4, then there's no technical reason not to.
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Old 12-03-2007, 10:04 PM   #9
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Brake Fluid White Paper

Looks like Steve has posted an excellent response. If anyone is interested in additional reading, and other excellent "real world" white papers on high performance braking systems you may want to take a look. (mostly automotive)

http://www.stoptech.com/tech_info/wp...fluid_1a.shtml

In the interest of full disclosure, until recently my son worked for StopTech so I may be biased!
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Old 12-03-2007, 10:10 PM   #10
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So which should I use? 2006 VRSCSE2 with brembos.
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Old 12-03-2007, 10:28 PM   #11
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Quote:
Originally Posted by blazrdude
So which should I use? 2006 VRSCSE2 with brembos.
I would use fresh DOT 4 from an un-opened container. Throw out what you don't use! Don't buy large quantities to have "on the shelf", unless you are in the brake business.
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Old 12-04-2007, 10:23 AM   #12
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Quote:
Originally Posted by blazrdude
So which should I use? 2006 VRSCSE2 with brembos.
I agree with JustSam. In 2006 Harley switched to DOT4 on all models except the Sportsters (actually the VRSCR and the Touring models had DOT4 in 2005) so I would continue to use it.
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Old 12-04-2007, 01:05 PM   #13
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Dot 4

Quote:
Originally Posted by Philthy
The piston seals on the calipers will be attacked by silicone brake fluid, the materials are incompatible. All brake systems absorb water. Dot 3/4 have anti-corrosion additives that absorb water in the system so it doesn't corrode things. Over time moisture uses up these additives so fluid changes must be part of routine maintenance. Dot 5 silicone fluids do not mix with water. Water that enters the system stays separate and drops to the lowest point in the system. Once there it will attract any dirt in the system, eventually forming a ball of fung that can clog orifices. The water also kills brake feel, water gives the brakes a spongy feel. Since the water is not absorbed in Dot 5, any water in the system will boil at 100 degrees C or 212 F regardless of the boiling point of the fluid. You can get vapor bubbles and even a vapor lock when using the brakes hard for a prolonged period of time unless the fluid is absolutely moisture free, which is why you never see silicone brake fluids used in performance cars or bikes or in racing. Dot 4 does not suffer this problem. Both suffer degraded boiling points with age, but Dot 4 does not allow water to separate out and boil off on it's own.
Harley recommends changing DOT4 fluids every 12 months, and I dont think a person would have to change DOT5 more often than that. Also, I read a thread somewhere here about the seals not being affected by DOT5 fluid, (according to a Brembo tech rep, anyways). However, I realize DOT4 is superior performing than DOT5. I just dont like the idea that it can ruin painted surfaces, since its nearly impossible to bleed the systems without spilling some of it.
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Old 12-04-2007, 01:31 PM   #14
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Quote:
Originally Posted by Jackflash
Harley recommends changing DOT4 fluids every 12 months
Not trying to second guess you here, but this alarmed me so I checked my service manual. 2006 manual, page 1-4, Maintenance Schedule says replace DOT4 every 2 years.
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Old 12-04-2007, 01:39 PM   #15
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Quote:
Originally Posted by Jackflash
... I read a thread somewhere here about the seals not being affected by DOT5 fluid, (according to a Brembo tech rep, anyways). ...
To be clear on this, I talked to the Brembo North America rep. that handles Motorsports (including motorcycles) and he told me that Brembo recommends DOT4 fluid. He then said that he hadn't heard that DOT5 could not be used. When I told him I was currently using DOT5 in Brembo calipers with no problems he said he would pass the info along to others at Brembo. So he didn't endorse the use of DOT5 or say it wouldn't harm the seals but he also didn't say I needed to get rid of it. I've never seen a rubber part damaged by DOT5 in the more than 20 years that I've been using it and can't imagine any type of rubber that would be damaged by this relatively inert fluid.
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