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 Brake fluid? 
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Scooterologist

Joined: Sat May 05, 2012 7:39 pm
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Post Brake fluid?
Just standard brake fluid? will it work? I just ordered a bunch of new parts coming in a couple of weeks including new brake pads. So excited!

Thanks,
Alex


Sat May 12, 2012 6:56 pm
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Post Re: Brake fluid?
oem works just fine. I use motul rbf600. only because I use it on my gsxr and cbr.

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Sat May 12, 2012 8:12 pm
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Post Re: Brake fluid?
I found just putting in the new pads brought the brake fluid back to fully topped up. You may not need to add any.

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Sun May 13, 2012 9:53 pm
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Post Re: Brake fluid?
kayakbuilder wrote:
I found just putting in the new pads brought the brake fluid back to fully topped up. You may not need to add any.


actually its supposed to be that way unless you let out fluid on purpose
its a sealed system and none should be missing normally


pads wear down, fluid level drops to fill in the space
new pads go back on fluid level gets pushed back up and fills up to normal

but it takes minutes to drain and refill with new fluid and bleed if you choose to do so
pretty easy no special tools needed

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Sun May 13, 2012 11:46 pm
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Post Re: Brake fluid?
ZUMIKE wrote:
actually its supposed to be that way unless you let out fluid on purpose
its a sealed system and none should be missing normally


pads wear down, fluid level drops to fill in the space
new pads go back on fluid level gets pushed back up and fills up to normal


That was my point.

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Mon May 14, 2012 12:23 am
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Post Re: Brake fluid?
Yea, unless you are low it shouldn't need any new fluid when doing a pad change. If it is low then you need to find the leak.

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Mon May 14, 2012 12:57 am
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Post Re: Brake fluid?
You should bleed the system while you're changing pads. It's not that the fluid level changes but that it becomes old. You don't change your car's oil by topping it off.

Brake fluid is designed to absorb moisture and over time the brake feeling will become softer and mushier. I am pretty sure that the Zuma takes DOT3 fluid. You can go with a DOT4 but will have to bleed it twice to ensure no DOT3 is left. DOT5 and 5.1 are mineral based if I recall and are not to be mixed with DOT3 or DOT4.

On the other hand, the hydraulic clutch on my VFR750 uses DOT3/4 fluid and the volume increases as the clutch wears. When I switched over to steel braided lines and new brakepads, I flushed out the old fluid and used OEM Honda fluid. The braking feel was much better with more modulation and firmer action.


Mon May 14, 2012 2:13 pm
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Post Re: Brake fluid?
Brake fluid should be replaced every 3 years or so but not every time the pads are changed{unless that is 3 years time}.

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Mon May 14, 2012 9:09 pm
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Post Re: Brake fluid?
I think it depends on the abuse that the fluid is exposed to. I have noticed that my fluid in less than a year has started turning to a yellowish color. This could be from the high heat it is exposed to in AZ and also the high use that it gets as well.

I know that in our cars that we run here I always change the fluid every year because of the high heat but also the fluid turns acidic after about a year and it will wear out the rubber parts in the system. However this is also on a manual car so the clutch shares with the brake fluid so that is another reason for me to change it.

Also on the master cylinder cap it says use DOT3 or 4 so Im not sure which would be in there now.

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Tue May 15, 2012 9:43 am
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Post Re: Brake fluid?
Blue Scoot wrote:
I think it depends on the abuse that the fluid is exposed to. I have noticed that my fluid in less than a year has started turning to a yellowish color. This could be from the high heat it is exposed to in AZ and also the high use that it gets as well.

I know that in our cars that we run here I always change the fluid every year because of the high heat but also the fluid turns acidic after about a year and it will wear out the rubber parts in the system. However this is also on a manual car so the clutch shares with the brake fluid so that is another reason for me to change it.

Also on the master cylinder cap it says use DOT3 or 4 so Im not sure which would be in there now.


The clutch system should be totally separate from the brakes!!!

I never heard of the fluid turning into acid.

The reason they say it should be replaced every 3 years or so is water absorption. If you have water in the fluid the water can turn to steam under heavy use and cause it to not work when needed. Some systems like the one on the Zuma is completely sealed and shouldn't absorb much water at all.

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Tue May 15, 2012 7:46 pm
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Post Re: Brake fluid?
You obviously have never worked on a VW haha those crazy Germans do everything backwards.

Yes the fluid can start to have moisture in it overtime but also after a ton of abuse on the track we like to keep fresh stuff in there and make sure there is no moisture as well. I have just heard that it becomes acidic overtime could just be a rumor but sounded believable

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Wed May 16, 2012 3:46 pm
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Post Re: Brake fluid?
Blue Scoot wrote:
You obviously have never worked on a VW haha those crazy Germans do everything backwards.

Yes the fluid can start to have moisture in it overtime but also after a ton of abuse on the track we like to keep fresh stuff in there and make sure there is no moisture as well. I have just heard that it becomes acidic overtime could just be a rumor but sounded believable

Maybe way back the fluid did become acidic but DOT3 and 4 and the newer Euro types don't. If you are talking about a racer then hell yea you need to change it all the time, along with everything else. Racing is much harder on everything than normal street use.

What VW are we talking about - old or new? That sound even crazier if it is new German engineering. :doh:

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Thu May 17, 2012 2:08 am
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Post Re: Brake fluid?
Well on both of my VWs, I had a 98 Jetta that I swapped a VR6 into and swapped in the hydraulic clutch that is OEM. Also on my VW 2004 R32 it has a hydraulic clutch as well and the clutch uses the same fluid as the brakes. They share the same fluid reservoir I'll have to take a pic to explain it ha, it really is crazy but almost makes sense to do it that way ha.

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Thu May 17, 2012 8:07 am
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Fri Aug 16, 2019 1:11 am
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