Author Topic: Definitive test for brake fluid  (Read 2154 times)

gjz30075

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Definitive test for brake fluid
« on: March 27, 2018, 08:08:46 PM »
I'd like to flush the braking system on 2249 just as preventive maintenance thing,  but I don't know what kind of brake fluid is in it now.     
I pulled a bit out and put it on a painted piece of metal and after several hours, no paint was peeling  up.   This tells me it MIGHT be
silicone, so I'm just wondering,  is there a better litmus test for brake fluid or have I just done it?   
Greg Z
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NC TRACKRAT

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Re: Definitive test for brake fluid
« Reply #1 on: March 28, 2018, 08:25:32 PM »
In all probability, it is silicone.  Usually, DOT 3 brake fluid will do a number on paint in short order.  Does the brake fluid have a color tint?  Light purple? Yellow? Amber?  Any chance of checking with the previous owner or mechanic who worked on the car? 
5S071, 6S1467

gjz30075

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Re: Definitive test for brake fluid
« Reply #2 on: March 29, 2018, 06:10:48 AM »
Stan, it's fairly clear, in color.    I can try to contact the previous owner/ shop.   That may be my best bet at this point.
Thanks!
Greg Z
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427gt

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Re: Definitive test for brake fluid
« Reply #3 on: March 30, 2018, 02:56:33 PM »
if it washes off your finger with water, it isn't silicon
67 gt 500 #1947 the drag unit. 70 gt 500 second owner.

gjz30075

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Re: Definitive test for brake fluid
« Reply #4 on: March 30, 2018, 03:59:14 PM »
Thanks, I'll try that.   I also understand there's a difference in specific gravity.   I no longer own a battery tester with specific gravity
numbers on it but I'm going to look for one this weekend.
Greg Z
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