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flathead4rd · 03-11-2025, 12:45 PM

I have DOT-5 in my 50. Disc in front drum in rear. Been there going on 10 years now. Here is the problem I see with DOT-5. You cannot bleed the brakes using the old method. It is important when bleeding to pump the brakes up very slowly. you cannot use the rapid pump up method. Why? Because rapid pumping puts air into DOT-5 fluid and you will never get it out. Results: Spongy brake pedal. Might as well drain the whole system and start over.

03-11-2025, 12:45 PM	#9
flathead4rd Senior Member Join Date: May 2010 Location: Michigan Posts: 571	Re: Switch to silicon brake fluid? I have DOT-5 in my 50. Disc in front drum in rear. Been there going on 10 years now. Here is the problem I see with DOT-5. You cannot bleed the brakes using the old method. It is important when bleeding to pump the brakes up very slowly. you cannot use the rapid pump up method. Why? Because rapid pumping puts air into DOT-5 fluid and you will never get it out. Results: Spongy brake pedal. Might as well drain the whole system and start over.