Motor Vehicle Maintenance & Repair Asked on June 29, 2021
I have a 2008 Kawasaki ER6 / Ninja 650R race bike. Within my class I must use OEM calipers & a OEM master cylinder. These components are also not allowed to be modified.
As the title says, the brake lever has a very soft feel and the lever’s travel from zero braking to maximum braking is very long. The brake fluid gets changed regularly and bled often. The calipers and the master cylinder have been recently rebuilt by a qualified technician and the bike has braided hoses.
None of these things have made much of a difference. The braided hoses have been on the bikes since I bought it, but as far as I can tell, they are in perfectly good condition.
What else can I do / check to try and improve this?
Thanks in advance
Willem
The cause of a soft brake lever is one or more of (a) air in the brake lines, (b) tired brake lines that expand as brake fluid pressure increases when the brake lever is pulled, (c) failing master cylinder, (d) failing wheel cylinder(s), and/or (e) a physical leak in the brake system that yields a puddle on the garage floor and may allow entry of air, causing (a).
(c) and (d) failures may not be evident externally. If the brake fluid level in the master cylinder reservoir isn't going down over time, then the problem is not (e).
You will need to examine the brake system, and rectify any fault(s) you find. Only because it's a very common problem, I'll guess the issue is (a). Find good instructions on how to bleed your machine's brakes, and follow them. You might ask other Ninja pilots how they do the job.
Answered by DavidSupportsMonica on June 29, 2021
do you have ABS? if not, it's air, or a damaged worn master cylinder (the pump on the handlebar)
if you have ABS it could be the abs module
Answered by Francesco on June 29, 2021
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