Front brake is soft - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #1 of 17 (permalink) Old 11-28-2017, 08:09 AM Thread Starter
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Front brake is soft

On my GSXR100 , i disambled calippers and clean them with water and soap. After that i did bleeding and there is not any bubles now i did it 100 time mabe in 1 caliper but

The leaver is Soft when i am using it first or secound time , after therd use it goes good, i mean first and secound push on lever is soft and dont have good brakes but 3rd push on it is ok what could be the problem ?
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post #2 of 17 (permalink) Old 11-28-2017, 12:04 PM
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Re: Front brake is soft

Air is in the system.
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post #3 of 17 (permalink) Old 11-28-2017, 12:05 PM
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Re: Front brake is soft

What year? As I recall, the GSXR100 uses inferior parts. Your symptoms are classic air-in-the-lines. It takes some fooling around to get the air out when they're as fully disassembled as you apparently did. There are many threads here about brake bleeding.
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post #4 of 17 (permalink) Old 11-28-2017, 12:43 PM
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Re: Front brake is soft

Air in the system. Crappy aftermarket levers also don't help
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post #5 of 17 (permalink) Old 11-28-2017, 03:26 PM Thread Starter
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Its 2009 year and i full disamble pistons also and clean them, it had always very strong breaks, i had oem lever on 2 position now this position is soft and i used 1 position but first and secound lever push is soft then becames normal ,

So i used bleeding like normal motorcycles and there is not bubles when bleeding and in this model there is somthing what i have to do for air becouse i disambled fully ?
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post #6 of 17 (permalink) Old 11-29-2017, 10:37 AM
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Re: Front brake is soft

The air is in the MC or in the line between the MC and the reservoir.
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post #7 of 17 (permalink) Old 11-29-2017, 12:03 PM
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Re: Front brake is soft

The K9 monoblocks are hard to disassemble but they should be OK unless you happened to use something like grease to pump the pistons out of the bores and didn't completely clean it out afterwards. So I'm with MacBayne that there's probably air in the MC. Start by bleeding at the MC. Then see if you can flush any remaining air through the lines and out the caliper bleeders.
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post #8 of 17 (permalink) Old 11-29-2017, 02:30 PM Thread Starter
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Thanks for advice . I did bleeding from bleeder on master cylinder but air is not comming out . Is it possible that air is traped but its nor comming from bleeder of master cylinder ? Also bleed a lot in caliper bleeders and no air on them also .

So this means that air is in system but they couod not come out from bleeders ? Is there another way to pump air out ?
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post #9 of 17 (permalink) Old 11-29-2017, 09:48 PM
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Re: Front brake is soft

One technique is to pump up the brakes and bleed without releasing the pressure. This requires an assistant or a bunch of strong rubber bands over the lever. This compresses the bubble which makes it easier to flush out.
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post #10 of 17 (permalink) Old 11-29-2017, 10:19 PM
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Re: Front brake is soft

Loosen the retaining bolts on the MC and turn it downward a bit. Tap it. Squeeze the line from the MC to the reservoir with the reservoir cap off. All you have to do is disrupt the bubble enough to get it to move and you can eventually burp it out the top or bleed it out.
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post #11 of 17 (permalink) Old 11-29-2017, 11:19 PM Thread Starter
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Is there any video of your explanation to do it right ? Whic one is retaining bolts on the MC ?
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post #12 of 17 (permalink) Old 11-29-2017, 11:31 PM
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Re: Front brake is soft

Have you gotten the MC recall done? If not, maybe take it to the dealer and let them figure it out.
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post #13 of 17 (permalink) Old 11-30-2017, 09:08 AM
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Re: Front brake is soft

Quote:
Originally Posted by Antonio_beqa View Post
Is there any video of your explanation to do it right ? Whic one is retaining bolts on the MC ?
The bolts that clamp it to the clipon.
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post #14 of 17 (permalink) Old 11-30-2017, 12:26 PM
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Re: Front brake is soft

It's my understanding that the MC-to-reservoir line comes out of the side of the MC on the OEM MC and out of the top of the MC on the recall part. I wouldn't expect the recall MC to benefit from turning.
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post #15 of 17 (permalink) Old 12-04-2017, 01:45 AM Thread Starter
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Thanks i solved problem from pump air
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post #16 of 17 (permalink) Old 12-04-2017, 07:49 PM
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Re: Front brake is soft

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Originally Posted by Antonio_beqa View Post
Thanks i solved problem from pump air
What?
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post #17 of 17 (permalink) Old 12-05-2017, 06:15 AM Thread Starter
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Air was in the line between MC and reservuar
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