Rear brake lever feeling more spongy than the front one
Is it very common that the the rear brake lever always feels slightly spongy than the front one, due to longer hose? Assume everything is perfect, e.g. no air bubble trapped, fresh fluid, perfectly aligned calliper, no lazy piston, true rotors…etc
I am currently using Hope Tech EVO M4. Today, I got a fresh new bleed (both F/R) from LBS and it feels like mentioned above, even in day one, the date I purchased them brand new from Hope.
Any thoughts?Posted 4 years agowwaswasSubscriber
It’s *possible* that the hose expands slightly under pressure and thus a longer hose will expand slightly more than a shorter one. Certainly on my car changing to braided hose over standard ones firmed the whole braking system up but I don;t know if pressures in mtb systems are enough for this to be an issue.
I suspect it’s still likely that there is air somewhere causing this – I manage to get both my brakes with the same feel post a bleed, anyway.Posted 4 years ago
I tried to think of it with some basic physics.
Both lever (Front and Rear ones) are identical which generate the same amount of force to push the fluid in each hoses. The longer hose (rear one) must contain more of it. So the forces that end up at the pistons will be weaken.
Longer hose allows more extension in the hose under pressure.
Longer hose results in more resistance? Just like electric cable?
I am just trying convince myself that the defect of the rear lever is NORMAL. 😉Posted 4 years agobigyinnMember
TJ Im sure denied this was the case. I beg to differ though and suggest the hose does expend more due to it length. Expansion can probably be lessened further by changing to a braided hose.Posted 4 years ago
But in both my bikes, the rear does feel slightly spongier. (same hoses, calipers, levers etc for front and rear)
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