1998 Cadillac Seville Support Question
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Question posted by doss55292 on September 13th, 2014
Bad Brakes
Current Answers
Answer #1: Posted by TexasDeviL on September 13th, 2014 7:34 PM
DOT 5 is a silicone-based brake fluid. It will never mix with DOT 3. It will only rise to the top of the glycol based DOT 3. Using DOT 5 in a DOT 3 system without proper flushing will cause damage to the seals and cause brake failure. DOT 5 brake fluid is not compatible with anti-lock brake systems. DOT 5 brake fluid absorbs a small amount of air requiring care when bleeding the system of air. (which ties directly into your trouble with the brakes not bleeding correctly)
If silicone is introduced into an older brake system, the silicone will latch unto the sludge generated by gradual component deterioration and create a gelatin like goop which will attract more crud and eventually plug up metering orifices or cause pistons to stick. If you have already changed to DOT 5, don't compound your initial mistake and change back. Silicone is very tenacious stuff and you will never get it all out of your system. Just change the fluid regularly.
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