I've bled a set of brakes twice. when changing a set of hoses. Fresh bleed on a new set of hopes as they weren't done up tight enough. Since 2005 ish
How often do you bleed your brakes?
~every four years.
There are only 2 reasons to bleed brakes or replace fluid.
1. Water contamination: symptom is spongy non progressive feel. Fluid change required, and you need to suss out where the moisture is getting in as it shouldn't.
2. air in the system, symptoms, long travel on lever that shortens when you pump the lever. Fix is to bleed brakes and suss out how air is getting in as it shouldn't be.
Other than that no need to bleed brakes at all in a sealed system. Cars are not sealed systems so need bleeding every 2 yrs or so. Bikes systems are sealed, so in theory you should never have to bleed brakes or replace fluid so long as your system remains fully sealed.
Depends on the brakes.
DOT systems, every year/18 months as the fluid goes all crappy with it being hygroscopic
Mineral systems, when they feel spongy-so hardly ever unless there's another problem with them.
usual rule for bike fettling:
People who fanny about bleeding brakes regularly complain about brakes a lot.
People who fit and forget tend not to mention them.
The fluid is hygroscopic, but the systems are fully sealed, so no moisture to get in there assuming your brake system seals are good and the brakes were bled properly upon installation. Other than tat the fluid does not degrade with time or use, until such time sealing fails. No need to change fluid otherwise, you are just introducing opportunity for problems.
In theory wobbliscott you are of course correct, but in reality I haven't come across a 'sealed' DOT system yet that doesn't need a fluid change after a few years.
The fluid always goes cloudy (water ingest) & can cause corrosion issues in severe cases.
hmmm every two weeks for me,as i think maintenance is highly important.
Only ever had to bleed a set of old Hayes HFX 9s once because I accidentally popped a piston out. Took me 10 minutes because because a I did a "bottom-up" bleed by forcing fluid into the system at the caliper with a large syringe.
Never had to bleed any of my Avids, but then I don't faff with them. If it ain't broke, don't fix it.
grum - Member
Bought my Pitch in 2008, never touched the Juicy 3s except for pads. Guess I've been lucky never known what it was like to have decent brakes so I don't know what I'm missing
Haha, I have thought that but honestly I don't ever feel I've been under braked. The wheels can be locked easily and I get plenty of feel from the levers.
sircharles : get back under your bridge.
Dunno, I've had SLX brakes for a bit, my mates got XTs and I still prefer my Avid Elixirs (and preferred the Juicys before that). Think it's mostly down to the lever design/shape than anything else though, plus the Shimanos seem to have a more on/off feel that I didn't get on with as much.
Also had a Formula K18 for a while but didn't get on with that much. Tiny pads that wear really quickly, and the lever was too chunky.
I've a set of 2004 M4s. They were bled because I fitted braided hoses in 2007. They still stop like I've just ridden into a barn door.
Some brakes work very well, some don't.
Load of bolloxs talked about brakes get real FFS
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