what brake fluid to use on my 2009 bmw f-800?
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02-03-2010,04:16 AM #1
PRAY BEFORE RIDING
2007 f800 BRAKE FAILURES
I wish to inform you who own 2007 F800st about a problem with some 2007 F800st where the brakes exercise not operate and in some cases caused crashes, I have spent time reviewing the bug and see a trouble with the brake fluid foaming causing poor or no braking with the factory Dot4 fluid. I have in the by used culling fluids in the brakes in many BMW in the by and have noticed no issues with a production made in Federal republic of germany which is interesting enough, its called GTLMA 5.ane from castrol, I have performed a complete flush change out on my wifes 2007 f800st and am doing others besides to forbid any failures on these 2007 models. I want to state this is for your data do equally you lot wish (Hope this saves someone from harm)...
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02-03-2010,10:22 PM #2
Registered User
Why practice you believe the mill DOT 4 fluid foams any more than than whatsoever other fluid?
Have you lot washed any sort of comparison or do you take a reference for this determination?Primary reason for asking is that I sometimes teach restriction system design and maintenance to aspiring runway types and take never seen foaming raised as a real earth issue previously. Many other imaginable means of getting air or some gas stuck in brake lines are well known and include things like mc fluid getting too low, entrained air in fluid coming out nether heat, boiling brake fluid in calipers for whatever i of a number of reasons (including improper pad installation). air sucked back into caliper through bleeder screw threads, moisture accumulation in old fluid then subjected to high operating temps, etc.
More info delight.
Thanks.
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02-04-2010,01:59 AM #3
Rally Rat
Try here:
http://f800riders.org/forum/showthread.php?t=18225
or hither:
http://f800riders.org/forum/showthread.php?t=34179
or here:
http://f800riders.org/forum/showthread.php?t=33349
In that location are more than if yous look.Even the OP'due south comments wait familiar:
http://f800riders.org/forum/showthread.php?t=36803I'll leave it to you to make up your mind virtually it; but I retrieve all you may accomplish by irresolute fluid types is absolving BMW of any liability if you or your meaning other can't stop and crashes.
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02-04-2010,03:twoscore PM #4
Registered User
Bob, thanks.
Saw null disarming me annihilation is wrong with BMW DOT iv fluid. Only normal issues of bike vibration creating bubbles tha can get into line if parts are left out , level gets low, etc plus an credible ABS pattern issue on the 800 that can patently exist exacerbated by suspension settings way off.
Nothing incorrect with going to a DOT 5.one but why? Don't need the added oestrus resistance and I'thousand not aware that foaming properties are whatever unlike. Reservoir blueprint and keping information technology up to level is the issue there.
Personally, except for racing situations I use manufacturer recommended fluids. For racing, the minor differences in restriction fluid VISCOSITY can be used to help (with pad selection) fine tune the precise brake release feel a driver prefers. This can be useful in route form and clay track racing for cars. don't know nearly this for bikes.
Having said that re the 800, my 08 RT has a relatively wimpy rear brake and rear ABS kicks in a lilliputian earlier than needed in my experience. No behaviors I consider dangerous, just not my preferred balance. I'd similar a harder rear pedal that goes all the way to lockup before ABS interferes every bit I learned threshold braking well a long fourth dimension agone.
BMW seems extremely paranoid/bourgeois virtually avoiding rear wheel lockups under brakes - an opinion that they can probably support with data- simply that takes some getting used to for old timers and dirt riders who have often deliberately slid their machines effectually on a locked rear wheel. (No, I've never endemic a Harley). No negatives to the ABS on the forepart of the RT - the brakes can exist used aggressively without any wierdness fom the ABS.
I have changed brake pads on all my Mercedes vehicles because the manufacturers choice makes threshold braking difficult and trips the car into the ABS early by design. Non a behavior I value on snow and water ice where maintaining full steering control on the verge of lockup is important.
Manufacturers tend to make stuff for the untrained....
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02-eleven-2010,ten:35 PM #five
Registered User
The only issue I have seen ...
I have owned and ridden my F800ST since 2007. I ride nearly daily, summertime, winter, spring and autumn, here in the NW. I have almost 15K on the bike now, and have only seen one result with the brakes.
About a yr and one-half, or so ago, I institute my rear brakes were not working. I took information technology to a store that I frequent (Non a BMW dealer, simply the possessor is a big BMW fan and is noted in the area for restoration of one-time bike, many BMW's) where the shop managing director is a certified BMW mechanic. He took one look at the bike and determined that the brake reservoir had been over filled by the BMW dealer and this had caused the fluid to over heat and boil under braking. He flushed and refilled the system and I take not had a problem since.
Makes you lot call up, doesn't it.
CoyoteBMW
53 years of BMW's - 1960 R26 and 2007 F800ST!
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02-12-2010,03:20 AM #6
PRAY BEFORE RIDING
I took samples from several bmw bike brakes dot 4 and filled them in a small-scale vial then took some used 5.ane gtlma from castrol out of one of my personal bike did the same, used brake fluid one year in the organisation -- ii vials ane dot4 and one v.1 and shook them both, the dot iv foamed a small layer on top, the v.1 did non.
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02-15-2010,07:16 PM #seven
Registered User
Wow; looks similar irrefutable scientific prove to me!
I'm going out and changing all the DOT 4 brake fluid in my 2009/F800ST immediately; after reading the results from this elaborate controlled experiment I think all manufactures of DOT 4 brake fluid should shut down their R&D labs right away...
Pray before you ride; Indeed!!!
Simply really; if you affluent and renew your brake fluid, (DOT 4, or other), at to the lowest degree annually, (may be needed more than often if you live near the sea), then y'all shouldn't have a problem. Restriction fluid is hygroscopic: (will blot and retain water nether some weather condition of humidity and temperature). This will as well reduce substantially or eliminate most mutual brake fluid problems.
Happy Presidents Day !
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02-xv-2010,07:55 PM #viii
PRAY BEFORE RIDING
Yes I piece of work off facts, some other annotation, when I did my wifes f800st brake fluid flush to 5.ane the left front caliper had a significant amount of air in it, I dont know since i purchased information technology used at 8000 mile if its ever been touched as far equally restriction bleeding or non, I found this interesting since the wheel merely has 9500 miles on it,. so from now on any new used bike i go,, im bleeding the brakes just to be safe...matthew
hastingsfuser2001.blogspot.com
Source: https://forums.bmwmoa.org/showthread.php?42715-2007-f800-BRAKE-FAILURES
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