Upgrading brakes question - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 15 (permalink) Old 07-27-2019, 11:08 PM Thread Starter
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Upgrading brakes question

Can someone tell me what brake fluid a 2009 Dyna Wide Glide uses? DOT5, DOT4 etc? The reason I ask is, that I am thinking of upgrading the rear brake caliper on my 1986 FXR, (which uses DOT5 brake fluid) to a twin piston caliper from a 2009 Dyna, and wanted to know if there is a compatibility issue with the brake fluid. Because, I believe different brake fluids need different types of rubber in the seals etc. Thanks in advance for any help or advice.
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post #2 of 15 (permalink) Old 07-28-2019, 01:36 AM
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It isn't that they used different types of rubber, its that when DOT4 and DOT5 fluid is mixed, it turns into a gel.

DOT4 is only used on bikes with ABS. The 2009 Dyna was not ABS so it had DOT5.
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post #3 of 15 (permalink) Old 07-29-2019, 07:01 AM
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That brake system would have used DOT 4.

ABS or not, HD went to DOT 4 around 2006 or thereabouts, so that all bikes would use the same fluid.
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post #4 of 15 (permalink) Old 07-29-2019, 07:53 AM
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Just clean the caliper very well, replace the rubber( which you should do anyway), then use whichever fluid you now use.
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post #5 of 15 (permalink) Old 07-30-2019, 04:50 PM Thread Starter
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Thanks guys. I knew about the 2 different fluids not being compatible, and turning to gel when they mix, but wasn't sure about using dot5 fluid in a caliper designed for dot4, and whether the rubber seals wouldbe ok, or whether they would fail (which obviously, could be quite disastrous, depending on where, and how quickly they failed!)
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post #6 of 15 (permalink) Old 08-01-2019, 07:13 PM
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It's DOT 5. It's purple fluid and your old fluid may look brown.

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post #7 of 15 (permalink) Old 08-01-2019, 07:34 PM
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Quote:
Originally Posted by Das Motorrad View Post
It's DOT 5. It's purple fluid and your old fluid may look brown.

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post #8 of 15 (permalink) Old 08-07-2019, 07:39 AM
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Quote:
Originally Posted by Das Motorrad View Post
It's DOT 5. It's purple fluid and your old fluid may look brown.
Who are you answering here?

The bike would have originally used DOT 4, as already explained in post #3.

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post #9 of 15 (permalink) Old 08-07-2019, 08:45 AM
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OP the '09 caliper ain't gonna fit your '86 FXR. '86 3/4" axle, '09 25mm axle.
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post #10 of 15 (permalink) Old 08-07-2019, 04:50 PM
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OP the '09 caliper ain't gonna fit your '86 FXR. '86 3/4" axle, '09 25mm axle.
But...Schmidty, he didn`t ask if the caliper would fit...

Good catch, we were all preoccupied with the DOT flavor...
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