Thread: brake question
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Old 10-29-2019   #6
Hib Halverson
 
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
Default Re: brake question

Quote:
Originally Posted by Thomas ZR-1 View Post
You should use DOT3, DOT4 and 5 are chemical more aggressive to the rubber seals in the brake system (rubber swelling).
"Thomas ZR-1", are you able to offer some facts to support the statement that DOT4 and DOT5 brake fluids are "chemical (sic) more aggressive" such that they cause swelling of rubber seals?

Also, DOT5 fluid is silicone-based and is an excellent choice for old "non-ABS" classic cars where preventing corrosion inside the brake system is the prime concern and braking performance is secondary.

DO NOT use DOT5 silicon-based brake fluid in any vehicle with ABS. The viscosity of DOT5 fluids is incompatible with the rapid fluid movement required for an ABS to operate properly.
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Hib Halverson
Technical Writer
former owner 95 VIN 0140
current owner 19 VIN 1878
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