SuzukiHayabusa.org
GENERAL => BIKE TALK => Topic started by: TT on January 08, 2018, 07:13:17 PM
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I’m rebuilding my front calipers should I use synthetic brake fluid or no?
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I suppose it would be better to use synthetic over conventional but like synthetic motor oil, your bike would probably never see a difference,
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Considering that Wal-Mart has synthetic for cheap, I wouldn't know why you wouldn't use it.
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Considering that Wal-Mart has synthetic for cheap, I wouldn't know why you wouldn't use it.
the $ is no problem i get valvoline synthetic for nothing the reason im asking is that i rebuilt my calipers twice before and used synthetic and each time i end up with a spongy lever, and the reason why its spongy is because when i release the lever the pistons retracted way too far so the next time u pull the lever the pistons have to travel all that extra distance to make up the slop making it spongy i thought maybe the synthetic has something to do with it
when i release the lever u can see the pistons retracted at least a 1/8 of a inch anyone know why????????? im puzzle fucked
and no there is no air trapped in the system i have a bleeder on the master cycl and i bleed this thing every way known to bleed a brake system i probably bleed 50 gals thru this thing
i also know that there is a tapper to where the seals sit in the caliper so its impossible to install the seals wrong
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If you are talking DOT 5 silicone based brake fluid, don't use it.
It is compressible and it is hard to get all the air bubbles out of and gives brakes a "wooden" feel.
Use a gylcol based 5.1 you'll be happier with the feel.
https://www.motosport.com/product/?adpos=1o1&cc=us&creative=188670675481&device=c&gclid=EAIaIQobChMI2sHRxpLL2AIVjeNkCh1UUQPuEAQYASABEgK5H_D_BwE&key=Motul-DOT-51-Brake-Fluid&matchtype=&mrkgadid=1409986374&mrkgcl=500&network=g&product_id=MUL0003-X001-Y001&pssource=true&rkg_id=h-62903758a83e02b786ebe15ae4c32256_t-1515510118&segment=badger
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If you are talking DOT 5 silicone based brake fluid, don't use it.
It is compressible and it is hard to get all the air bubbles out of and gives brakes a "wooden" feel.
Use a gylcol based 5.1 you'll be happier with the feel.
https://www.motosport.com/product/?adpos=1o1&cc=us&creative=188670675481&device=c&gclid=EAIaIQobChMI2sHRxpLL2AIVjeNkCh1UUQPuEAQYASABEgK5H_D_BwE&key=Motul-DOT-51-Brake-Fluid&matchtype=&mrkgadid=1409986374&mrkgcl=500&network=g&product_id=MUL0003-X001-Y001&pssource=true&rkg_id=h-62903758a83e02b786ebe15ae4c32256_t-1515510118&segment=badger
no im using dot4
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Did you try zip tying your lever back over night?
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YEP like i said i tried eveything know to man kind the problem is not air in the system the problem is the pistons are retracting too far when releasing the lever
ive read other forums that other guys have had the same problem but no one knows why
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My guess would be that the fluid changes the stiction of the seal to the piston. The seal is rectangular and its OD is held stationary in the caliper groove. The ID is free to move on the piston and when the brake is applied the seal will distort slightly and the distortion is the only thing that provides the correct amount of retraction. The factory materials and fluid choice used on the contact surfaces are balanced to provide that just right amount of seal stiction that in turn will create the correct amount of seal distortion for retraction. If the fluid used makes the seal harder to slip on the piston surface there will be more distortion created when the brake is applied and therefore more retraction when it is released.
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My guess would be that the fluid changes the stiction of the seal to the piston. The seal is rectangular and its OD is held stationary in the caliper groove. The ID is free to move on the piston and when the brake is applied the seal will distort slightly and the distortion is the only thing that provides the correct amount of retraction. The factory materials and fluid choice used on the contact surfaces are balanced to provide that just right amount of seal stiction that in turn will create the correct amount of seal distortion for retraction. If the fluid used makes the seal harder to slip on the piston surface there will be more distortion created when the brake is applied and therefore more retraction when it is released.
very good explanation makes alot of sense, then maybe i should use suzuki brake fluid
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Doesn't need to be Suzuki fluid just the grade recommended in the manual.
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You didn't rebuild the master cylinder right? When changing over, all parts of the system need rebuilding to void the system completely away from non synth fluid.
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You didn't rebuild the master cylinder right? When changing over, all parts of the system need rebuilding to void the system completely away from non synth fluid.
the master was rebuilt 2 yrs ago i suppose i could disasseble it and clean it up
but the valvoline dot 3 & 4 is compatible with non synthetic fluid so maybe trace amounts wont hurt any thing??
https://shop.advanceautoparts.com/p/valvoline-dot-3-and-4-synthetic-brake-fluid-32-oz-601458/7080002-P
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found this
https://www.allpar.com/forums/threads/brake-pedal-to-floor-calipers-retracting-too-far-ve-valiant.151012/