Synthetic or Regular Brake Fluid??


Technical information and Q&A applicable to all years and models of Goldwings
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cas82375
Posts: 2
Joined: Sat Apr 04, 2015 6:17 pm
Location: langhorne, pa
Motorcycle: 1983 GL1100A Aspencade

Synthetic or Regular Brake Fluid??

Post by cas82375 »



1983 Aspencade GL1100, Need to know if it is ok to switch to Synthetic? Any help would be great.. Thanks..... :D


steve491
Posts: 15
Joined: Thu Sep 25, 2014 8:04 am
Location: Charlotte, North Carolina
Motorcycle: 1981 GL1100 Interstate

Re: Synthetic or Regular Brake Fluid??

Post by steve491 »

I think you mean Silicone based brake fluid (DOT 5 or newer). The two are not compatible. I would use any DOT 3 or 4.
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Dusty Boots
Posts: 735
Joined: Mon Oct 26, 2009 4:25 pm
Location: Alvinston, SW ON
Motorcycle: 1992 GL1500 Aspencade
2013 Victory Cross Country Tour

Re: Synthetic or Regular Brake Fluid??

Post by Dusty Boots »

Yes, you can use synthetic DOT 3/4 brake fluid with your bike and have no compatibility issues!
cas82375
Posts: 2
Joined: Sat Apr 04, 2015 6:17 pm
Location: langhorne, pa
Motorcycle: 1983 GL1100A Aspencade

Re: Synthetic or Regular Brake Fluid??

Post by cas82375 »

Dusty Boots wrote:Yes, you can use synthetic DOT 3/4 brake fluid with your bike and have no compatibility issues!
thanks, also will the synthetic harm any of the rubber seals???
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newday777
Posts: 2413
Joined: Tue Jan 11, 2011 5:21 pm
Location: Milford NH
Motorcycle: 2008 Cabernet Red. Level 4 bought at 15,000 now 172,000

1975 CB750 K5 Planet Blue 11,00 miles

Project bikes
1976 CB750 K6 Anteres Red 25,000 miles, 2 more K6s, 1 K4, 1 K8

Past rides
1983 GL1100A Wineberry 63,000 miles(sold)

1999A Restored from PO neglect & sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Synthetic or Regular Brake Fluid??

Post by newday777 »

Synthetic Dot4 will do no harm. It has a higher boiling point than Dot3, so it is much better.
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Ghostman
Posts: 438
Joined: Fri Aug 14, 2009 10:52 am
Location: Midwest
Motorcycle: gl1800

Re: Synthetic or Regular Brake Fluid??

Post by Ghostman »

All DOT3,4 and 5.1 brake fluid is synthetic (polyglycol and glycol ethers)base. Boiling points are due to each brands formula of additives. DOT 5 is silicone based and shouldnt be mixed at all. Some HDs use DOT 5.


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