Spungy brake pedal


Information and questions on GL1800 Goldwings (2001-2017)
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rlwfarrier
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Joined: Sat Dec 05, 2009 9:42 am
Location: Elberton, GA
Motorcycle: 1989 GL1500

Spungy brake pedal

Post by rlwfarrier »



I am working on a 2002 GL 1800 with a spungy brake pedal. I have changed the brake fluid and bled the brakes. 99% sure that there is no air in the system. You must pump the brake pedal one time and then you have a firm brake pedal. The bike will safely stop, but I know that this is not right. I have a theory about what is wrong, but before I say what I think the problem might be I would appreciate some feed back from someone else who might have had this problem and what you did to fix it.

Thanks in advance for you input.



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oilboy1162
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Re: Spungy brake pedal

Post by oilboy1162 »

18 YEAR OLD SPONGY BRAKE LINES?
:lol: I know people say we spend too much money on our rides, but I can't hear them when I'm 1000 miles away! :roll:

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keithg64
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Re: Spungy brake pedal

Post by keithg64 »

Did you bleed the brakes in the correct sequence? Being that this is a linked braked system there is a procedure to follow.

Front Brake Reservoir

1: Front Right Caliper Upper Bleeder Valve 8mm
2: Front Left Caliper Middle/lower Bleeder Valve 10mm


Rear Reservoir (under right side engine cover)

1: Front Left Caliper Upper Bleeder Valve 8mm
2: Front Right Caliper Lower Bleeder Valve 10mm
3: Rear Caliper Lower Bleeder Valve 8mm
4: Anti-Dive: bleeder valve on top 10mm
5: Rear Caliper Upper Bleeder Valve 10mm
It's not what you buy, it's what you build.

rlwfarrier
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Joined: Sat Dec 05, 2009 9:42 am
Location: Elberton, GA
Motorcycle: 1989 GL1500

Re: Spungy brake pedal

Post by rlwfarrier »

I did not follow that specific sequence. I will go back and do it again in that order. Thanks for the help. I will report back when I have time to do that.

Have a great weekend.

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WingAdmin
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Re: Spungy brake pedal

Post by WingAdmin »

You can often diagnose problems by what the pedal/lever is doing:

No brakes, cannot pump up brakes: air in brake lines and/or empty reservoir
Spongy brakes with too much travel (or requires pumping up to obtain sufficient pressure): air in brake lines or swelling hoses
Firm brakes with too much travel (or requires pumping up to obtain sufficient pressure): Stuck piston or excessive rotor runout
Brakes operate, but may require pumping to obtain sufficient pressure, and pedal sinks slowly after pressure applied: brake fluid leak or worn seal in master cylinder
Brakes firm and seem to work normally, but little or no braking actually occurs: oil or brake fluid contamination on rotor and/or pads

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GoldWingrGreg
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Re: Spungy brake pedal

Post by GoldWingrGreg »

rlwfarrier wrote:
Thu Jun 18, 2020 9:03 pm
I am working on a 2002 GL 1800 with a spungy brake pedal.
Is this a trike ???

rlwfarrier
Posts: 10
Joined: Sat Dec 05, 2009 9:42 am
Location: Elberton, GA
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Re: Spungy brake pedal

Post by rlwfarrier »

Not a trike.
Thanks

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GoldWingrGreg
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Re: Spungy brake pedal

Post by GoldWingrGreg »

What bleed method are you using ... manual, vacuum, or pushing with a bladder ???

rlwfarrier
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Re: Spungy brake pedal

Post by rlwfarrier »

A big thanks to keithg64 in providing the correct sequence to bleed the brakes. I went through that procedure about 3 times and now I have a good pedal.

What I thought I knew, I did NOT know.

Once again thanks to keith64 and to all of you who reached out to me for the solution.

Have a great week.

autonoob
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Re: Spungy brake pedal

Post by autonoob »

This is really a helpful thread thanks for providing the sequence.

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keithg64
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Re: Spungy brake pedal

Post by keithg64 »

You welcome. I found that last year while doing my brakes. Using speed bleeders helps in changing brake fluid and making sure all the air is out.
It's not what you buy, it's what you build.

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keithg64
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Re: Spungy brake pedal

Post by keithg64 »



It's not what you buy, it's what you build.

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