Soft Rear Brake - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 25 (permalink) Old 10-23-2020, 05:57 PM Thread Starter
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Soft Rear Brake

I have a 2014 ES FJR, two friends have a2009 and 2016 ES. All 3 of us have a soft rear brakes. All of us have bled the brake and it gets firm only to get soft later.

Has anyone experienced this or have a suggestion?

Thanks for any help.
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post #2 of 25 (permalink) Old 10-23-2020, 06:38 PM
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are you bleeding the integrated front caliper while you are bleeding the rear caliper....possible air in front line or caliper

Last edited by fjrville03; 10-23-2020 at 06:39 PM. Reason: mis spelled air
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post #3 of 25 (permalink) Old 10-23-2020, 07:00 PM Thread Starter
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Yes. I would bleed the front first, but the back brake would still get soft again..
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post #4 of 25 (permalink) Old 10-23-2020, 07:59 PM
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How much fluid did you push through? Are you using a vacuum bleeder? Are all 3 of you doing it the same way?

Ray
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post #5 of 25 (permalink) Old 10-23-2020, 08:30 PM
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Sounds like an enlarged prostate to me. You need to have a tech stick a fonger up the exhaust pipe.

Maybe getting a device that will allow tou to cycle the ABS module would help.... if only there were someway of getting one....
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post #6 of 25 (permalink) Old 10-23-2020, 10:35 PM
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If you apply the front brake slightly does the rear still feel soft ?

Steve P
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post #7 of 25 (permalink) Old 10-23-2020, 11:22 PM
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Soft Rear Brake

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Originally Posted by klawson View Post
I have a 2014 ES FJR, two friends have a2009 and 2016 ES. All 3 of us have a soft rear brakes. All of us have bled the brake and it gets firm only to get soft later. Has anyone experienced this or have a suggestion? Thanks for any help.
klawson,

I assume you are taking the advice posted above.

My 2008 has front brakes linked to the rear brakes, and the right front caliper must be bled before bleeding the rear brakes. I was having the same poor results as you, so I watched the old brake fluid that came (through a clear tube) from each caliper. I realized that I was not really moving much brake fluid, doing the job in a conventional way. Instead of letting the rear brake lever move up with my foot on it, I pressed the brake pedal, working as you would normally bleed the brakes, but then side-stepped the pedal, so the pedal could spring upward as fast as the return spring could pull it up. Repeat as needed.

That trick made a real improvement on how much old brake fluid (and air) got removed from the brake system. The result was a firm, like-new feel to the brake pedal, much better than my early attempts. I did the same trick when bleeding the front brakes, with equally good results. I suppose that a vacuum or pump system for brake fluid could do as well or maybe slightly better, but now I see no need for the extra gadgets. YMMV.

.
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post #8 of 25 (permalink) Old 10-24-2020, 12:10 AM Thread Starter
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Rayzerman,

Two of us used a vacuum pump independently of each other.
I ran a about two of the pump containers through.

The front brake is perfect.
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post #9 of 25 (permalink) Old 10-24-2020, 09:34 AM
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Have you also run the ABS bleed procedure? That helped mine improve a little.
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post #10 of 25 (permalink) Old 10-24-2020, 09:59 AM
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I have had mixed results with vacuum bleeders... once done, re-bleed the conventional way. After that and still not totally firm (it should be), you can tie the rear brake pedal down for a few hours or overnight, and a quick re-bleed should fix you up.
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