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Hydraulic Brake Bleeding Interval

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Hydraulic Brake Bleeding Interval

Old 02-05-23, 10:00 AM
  #26  
Polaris OBark
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Well, just do the pads first. That is dead easy and might make all the difference. If you do use the fluid, wear gloves and eye protection.

Is the whole caliper moving? If so, you absolutely have to address that. If it has an adapter, figure out which part is moving. If it is between the adapter and the caliper, you have nothing to lose. If it is indeed the fork, I would very cautiously tighten it a bit more, and perhaps use some locktite. The force vector should be straight down, so it shouldn't have to be insanely tight.
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Old 02-05-23, 10:10 AM
  #27  
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Originally Posted by Iride01
Brakes systems on cars with metal brake lines will get corrosion from the water that the DOT 3 fluid absorbs. But even in cars that usually takes many years to get to the point where it's and issue for those cars. Then it's quite costly.
I've never replaced a brake line that corroded from the inside out. Either corrosion from the outside (especially where strapped to the frame) or a rubber hose/caliper/wheel cylinder failure first. Living in the salt belt, owning a plow truck, and having replaced hundreds of feet of brake lines, I now only use Ni-Copp on replacements with stainless fittings and bleeder screws.
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Old 02-05-23, 12:43 PM
  #28  
tomato coupe
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Originally Posted by DaveSSS
If mineral oil is so great cars and motorcycles would use it but almost none do.
Different applications often dictate different solutions.
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Old 02-05-23, 02:10 PM
  #29  
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Originally Posted by DaveSSS
Calling it corrosive is a stretch.
The MSDS that comes with every container labels it corrosive. Not me.

My main objection to its use is that it is hygroscopic.


​​​I don't bother to wear nitrile gloves when bleeding. I've been bleeding automotive brakes since 1969.
How compelling. Just like the chain smoker who says they've [cough-cough] avoided lung cancer.


Dismissing mineral oil because it isn't good for stopping a semi is equally comical.
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Old 02-05-23, 03:08 PM
  #30  
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SRAM has many videos on bike maintenance. The bleed video is particularly good, since there are certain steps that must be done in the correct order. Buy a bleeding edge .bleed kit first.


​​​​​​
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Old 02-05-23, 03:29 PM
  #31  
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Both my bikes are Shimano/mineral oil. I do a lot of hill riding and I ride my brakes a lot on descents. Because of this I flush my disc brakes annually. For the cost of my time and one bottle of Shimano mineral oil, I find the time to be well invested.
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Old 02-05-23, 03:35 PM
  #32  
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Originally Posted by NoWhammies
Both my bikes are Shimano/mineral oil. I do a lot of hill riding and I ride my brakes a lot on descents. Because of this I flush my disc brakes annually. For the cost of my time and one bottle of Shimano mineral oil, I find the time to be well invested.
yes our tandem needs the back line flushed more often steep hills that need hard braking will do that.
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Old 02-05-23, 11:27 PM
  #33  
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The whole fear of Dot is way over done. Water gets into both Dot and mineral oil systems. The difference is Dot distributes the water throughout the whole system while with mineral oil it gathers in the lowest point often the caliper. And yeah Dot is corrosive so don't leave it on your skin or paint for hours or drink it. If you can avoid those things you will be fine.
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Old 02-06-23, 07:14 AM
  #34  
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I would flush the fluid at intervals where the fluid actually gets noticeably dirty. Try it after one year, if it looks pretty clean, extend the interval.

On my XTs, they are just noticeably dirty after one year of heavy riding.

Of course, some people never flush their fluid or do a bleed. Sometimes it works out OK for many years, other times not.

I will add this: I canít speak for road brakes, but half the time I try someone elseís hydros on their mountain bike, it feels to me like they need to be bled.
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Old 02-06-23, 08:15 AM
  #35  
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Originally Posted by Canker
The whole fear of Dot is way over done. Water gets into both Dot and mineral oil systems.
I guess Iím not worried about the fluid if it works.

So many people, have had terrible experiences with SRAM brakes, and good experiences with Shimano and Magura. The mind likes to make connections ya know.
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Old 02-06-23, 08:17 AM
  #36  
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Originally Posted by DaveSSS
SRAM has many videos on bike maintenance. The bleed video is particularly good, since there are certain steps that must be done in the correct order. Buy a bleeding edge .bleed kit first.


​​​​​​https://m.youtube.com/watch?v=mO5lipPGGlo
Thanks for posting that, I have a few tools to buy and the SRAM bleeding kit. Looks easy.
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Old 02-06-23, 01:30 PM
  #37  
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The thing about Sram brakes is they are less forgiving about half assing bleeding than shimano. There are multiple ways you can bleed shimano brakes and still get a pretty good lever. Sram you have to follow the directions. If you actually step by step bleed shimano brakes the way you are suppose to Sram really isn't much harder these days. Back BACK in the day avid(sram) were a pita. My fingers would hurt for a day or two after bleeding my juicy 5s but my Avid elixirs which are still pretty freaking old aren't bad.
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Old 02-07-23, 09:41 AM
  #38  
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Originally Posted by Kapusta
Of course, some people never flush their fluid or do a bleed. Sometimes it works out OK for many years, other times not.
That would be me. But actually had to do bleed on my mountain bike last year. Lost my rear brakes.
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Old 02-09-23, 09:03 AM
  #39  
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Originally Posted by Spandex_fairy
How often should I be bleeding the brakes on my road bike? Is it like a car, where I can pretty much ignore it?
If you have ABS on your car, you may want to re-think that. Failure to flush out your braking system is bad, but not flushing it on an ABS equipped car can get very, VERY expensive. Have a shop do it, as they will probably need special tools and/or procedures to do a "secondary bleed" of the ABS unit itself, which opens the solenoids and activates the internal pump to flush the fluid out of the unit.
Believe me, if the fluid in the ABS unit is allowed to get bad enough to corrode the sensitive parts in the unit, you're looking at a huge bill, both in parts and labor.
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Old 02-09-23, 09:01 PM
  #40  
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Originally Posted by Spandex_fairy
I'm using Shimano/ mineral oil; looks like I'm good for some time then. The brakes were mushy from brand new. The service guy told me that's how it's supposed to feel. I didn't believe him so I took the bike home and flushed it myself (multiple times). It seems he was right because nothing changed. I'm using the short reach shimano 105 shifters that came on my 52cm bike. What a difference in pull stroke and force vs performance moto master cylinders, such as a brembo rcs19 or an Accosatto equivalent.
My Shimano hydraulic disc brakes went 5K miles before I flushed and bled them. Probably should have done it earlier. Braking was starting to get soft.
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Old 02-11-23, 05:41 PM
  #41  
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Originally Posted by Bald Paul
If you have ABS on your car, you may want to re-think that. Failure to flush out your braking system is bad, but not flushing it on an ABS equipped car can get very, VERY expensive. Have a shop do it, as they will probably need special tools and/or procedures to do a "secondary bleed" of the ABS unit itself, which opens the solenoids and activates the internal pump to flush the fluid out of the unit.
Believe me, if the fluid in the ABS unit is allowed to get bad enough to corrode the sensitive parts in the unit, you're looking at a huge bill, both in parts and labor.
Would just changing brake fluid be enough or are saying it has to be a flush?
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Old 02-11-23, 05:47 PM
  #42  
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Originally Posted by greysquirrel
Would just changing brake fluid be enough or are saying it has to be a flush?
Changing the brake fluid won't do it. The solenoids, pump and valves within the ABS unit have to be activated by a tool (usually a computer) in order to get all the old fluid trapped in the unit itself out.
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Old 02-11-23, 09:39 PM
  #43  
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Originally Posted by greysquirrel
Would just changing brake fluid be enough or are saying it has to be a flush?
If there is moisture in there it could be considered cheap insurance to flush the system but flushing is certainly no guarantee the ABS module won't fail. Not flushing is no guarantee that it will fail.
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Old 02-12-23, 07:21 AM
  #44  
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I was not aware that ABS was so common in bikes these days.
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Old 02-12-23, 07:32 AM
  #45  
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Originally Posted by Kapusta
I was not aware that ABS was so common in bikes these days.
It might be coming.
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Old 02-12-23, 09:52 AM
  #46  
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Originally Posted by Kapusta
I was not aware that ABS was so common in bikes these days.
its not and even then I think its only a couple of e bike brands like bosch and strromer that really have it and only on a few bikes.
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Old 02-12-23, 04:35 PM
  #47  
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Originally Posted by big john
It might be coming.
Not might...It's 100% guaranteed that few years from now high end bikes will have some sort of ABS , traction control,, radars, sensors, all kinds of detectors and maybe even electronic assisted steering.. Even cycling bibs will have built in sensors to keep your whole body in perfect harmony while riding.
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Old 02-12-23, 05:13 PM
  #48  
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Originally Posted by wolfchild
Not might...It's 100% guaranteed that few years from now high end bikes will have some sort of ABS , traction control,, radars, sensors, all kinds of detectors and maybe even electronic assisted steering.. Even cycling bibs will have built in sensors to keep your whole body in perfect harmony while riding.
Can't wait.
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Old 02-12-23, 06:47 PM
  #49  
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Originally Posted by wolfchild
Not might...It's 100% guaranteed that few years from now high end bikes will have some sort of ABS , traction control,, radars, sensors, all kinds of detectors and maybe even electronic assisted steering.. Even cycling bibs will have built in sensors to keep your whole body in perfect harmony while riding.
Next thing you know, we will have automatic cyclists and all the actual cyclists will stay home and drink beer.
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Old 02-12-23, 07:01 PM
  #50  
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Originally Posted by Lombard
Next thing you know, we will have automatic cyclists and all the actual cyclists will stay home and drink beer.
Drone bikes.
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