RossKean
Well-known member
Did you bake them out in an oven?
Brake Pads Soaked in Brake Fluid - Salvageable?
- Thread starter JamesK
- Start date
Help Support Yamaha FJR Motorcycle Forum:
I kind'a doubt your brakes will reach 1000 degrees F used in that test. At that temperature almost everything burns. If they did get that hot there isn't a DOT rating available that would prevent the fluid from boiling into oblivion.
Even brakes that are being heavily used will only reach maybe ~ 300F. Brake fluid in the pads is not going to burst into fiery flames of death. Even if the residue was to reach the flashpoint there wouldn't be enough in there to sustain a flame
Last edited by a moderator:
Donal
Well-known member
"there wouldn't be enough in there to sustain a flame" That's the killer punch right there...................................
If they could, you'd be competition for Gold Wingers and their "Ring Of Fire" light kits.
Afast03nNJ
Well-known member
300 Degrees is nothing. The disc and pad surface can see temps upwards of 1,000 degrees under severe use. At that temperature Cementite forms on the disc surface which is one of the causes of brake judder (warped rotors) felt on cars. To further that, the description most use, warped rotors, isn't really what happens, it's pad material transfer that causes brake judder. And that actually happens when the operating temperature of the brake pads is exceeded and that's way past 300 deg. Brake fluid doesn't directly see those temps (but can) as it's isolated by the pad and caliper itself. Under normal operating conditions most of the heat is on the rotor and pad surface. Venting on the rotor cools things down between stops.
Last edited by a moderator:
That's true, I was thinking of the fluid's temps in its normal position behind the pistons, not the pads and rotor. Still, I fail to see how there could be a flame on the pads with so little fluid in them. If it burnt, it would just oxidize and be gone. Even less reason to be concerned IMO.
Last edited by a moderator:
PhilJet09
Nondescript FJR Hierarchy Displayed
I get a "Brake Overheat" cas message in the Gulfstream at 650*C (about 1200*F). I've seen as high as 500*C doing landing currency for three pilots, even leaving the gear hanging.
I know...not exactly relevant here, but still interesting to see some of the temps certain brake systems can tolerate.
I know...not exactly relevant here, but still interesting to see some of the temps certain brake systems can tolerate.
Phil,
Are those temps in the calipers or are there sensors on the rotors or pads somewhere? Must be the latter.
Are those temps in the calipers or are there sensors on the rotors or pads somewhere? Must be the latter.
PhilJet09
Nondescript FJR Hierarchy Displayed
Honestly, I'll have to look a little closer next time I go in to work. I know the general location of the sensors, but couldn't say for sure if they're in the calipers or somewhere in the stack.
PhilJet09
Nondescript FJR Hierarchy Displayed
Here's a good link Fred. https://code7700.com/g-450_landing_gear_wheels_and_brakes.html
The sensor is in the inner chassis of the brake pack which contains the 5 pistons (caliper, if you will).
The sensor is in the inner chassis of the brake pack which contains the 5 pistons (caliper, if you will).
So the whole caliper gets that hot? Wow. How do they keep the fluid from boiling? The dry boiling point of the best auto brake fluids (DOT 5) is only 500F.
PhilJet09
Nondescript FJR Hierarchy Displayed
Good question, Fred. I tried unsuccessfully to find the boiling point of Skydrol. Surely, it has to be lower than 650C. Now I have another question to annoy my instructors at my next recurrent class.
majicmaker
Well-known member
The fire point of Skydrol is 350F. The auto ignition point of Skydrol is 880F. It's even less if its vaporized.
Wasn't familiar with Skydrol, had to google it. Trade name for a Phosphate Ester based hydraulic fluid. Can't find any boiling point specs anywhere, just the flashpoint/burning temps.
Seems the stuff is pretty nasty, so not in common use as brake (or other hydraulic) fluid on non-commercial airline applications. They use it there for its fire resistance attributes.
Most smaller airframe manufacturers (and the military) are still specifying mineral based fluids or more recently, synthetics for hydraulics. Seems the latest synthetic spec is MIL-PRF-87257, which is supposed to have the fire retardant-ness of Skydrol and maintain viscosity at low temps better than the minerals.
Seems the stuff is pretty nasty, so not in common use as brake (or other hydraulic) fluid on non-commercial airline applications. They use it there for its fire resistance attributes.
Most smaller airframe manufacturers (and the military) are still specifying mineral based fluids or more recently, synthetics for hydraulics. Seems the latest synthetic spec is MIL-PRF-87257, which is supposed to have the fire retardant-ness of Skydrol and maintain viscosity at low temps better than the minerals.
rp.foster
Member
James,
The FJR brake system is one of the most advanced brake systems on the road today. Unified braking, ABS, multiple pistons, sensors, ECS, ECU you name it, it's packed in there. Even with all this technology, the bike wont stop if the pads are not performing as designed...you know the answer. Fred is right, with proper knowledge, attention and preventive maintenance and tools anything is possible. Another element is the human. If you are used to performing preventive maintenance, performing preflight (and post flight) inspections, shaving pads, and have access to some of the manufacturing tools (ovens) mentioned above, you very well could reduce your risk. If you are like the other 95% of the folks on the road, buy new ones.
The FJR brake system is one of the most advanced brake systems on the road today. Unified braking, ABS, multiple pistons, sensors, ECS, ECU you name it, it's packed in there. Even with all this technology, the bike wont stop if the pads are not performing as designed...you know the answer. Fred is right, with proper knowledge, attention and preventive maintenance and tools anything is possible. Another element is the human. If you are used to performing preventive maintenance, performing preflight (and post flight) inspections, shaving pads, and have access to some of the manufacturing tools (ovens) mentioned above, you very well could reduce your risk. If you are like the other 95% of the folks on the road, buy new ones.
majicmaker
Well-known member
It IS nasty Fred. You have No idea. If you touch that stuff with your bare hands, your skin will feel like its on fire. You will run as fast as you can to the nearest sink to wash your hands for 15 minutes before the burning goes away. When the burning stops, you will think that you got all of it off. Then, the next time you have to go to the John for a leak and unzip your pants and pull your tallywhacker out, you will find out immediately that you didn't. Don't ask me how I know that! (About a dozen times!).
)Peter Murray
Well-known member
It's your LIFE why not !
With out creating a extensive list of Disabilities vs Death go ahead use the oil soaked shit..
IQ ?
GOOD GRIEF WTF !
FJRay
Well-known member
If you read the original post it states they were soaked in brake fluid NOT oil. Huge diference.
You are allowed your opinioncause they are like assholes, we all have one but insulting a persons motives and questioning their inteligence shows yours.
WTF??
JamesK
Got to ride
RossKean
Well-known member
Shouldn't be a problem - just ensures that there's little in the way of organic residue. The hydraulic fluid is, in fact, water soluble and I seriously doubt that there is any issue at all - not "oil" as someone suggested. I changed pads a few days ago and the hose popped off the bleeder during the process and a little fluid dripped over the pads. Just hosed it off with water and finished the service. No ill effects and did not expect any.
Similar threads
