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Another brake question

Al GalloAl Gallo

So it's Sunday morning and I've finally had time to install my new MC. I've bled it and am about to bleed each wheel in order.  The question I have is about brake fluids being compatible with each other .  I've been using Prestone synthetic dot 3 so far, but I will empty the bottle before I'm through bleeding the brakes.  The local Ace (2 miles away) is where I bought the Prestone, but they are out of it.  They have PEAK synthetic dot 3 fluid on the shelf. Is that going to be compatible with the Prestone?

 

I'm sorry if this is a stupid question, but the only other place that's open on Sunday is the Auto Zone which is 30 miles each way.  Life near the end of the sandbar.

Last edited by Al Gallo
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Jim KellyJim Kelly2013 SAS coupe-Fiji

Al,

 

DOT 3, DOT 4,  & DOT 5.1 are all glycol-based brake fluids that are fully interchangeable.  DOT 5 is the one that's different, and can't be mixed with any of the above.  Glycol-based brake fluids absorb moisture at the rate of 2-3%/year, so manufacturers suggest changing every 2-3 years.  Unless we are tracking our cars, changing brake fluid when you do a major brake job should be sufficient.  More water in the system means a lower boiling point for the fluid. 

Al GalloAl Gallo

Thanks to all.  I'm back on the road with my drum brakes until cooler weather when I'll install a front disk brake kit. Mission accomplished for now except that the old brake fluid is still dripping out from where the pan and bulkhead come together and I can't get at it to clean it up. I'll just keep spraying brake kleen in there and wiping it up for now.

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