firenut Posted January 15, 2019 Share Posted January 15, 2019 I just finished replacing all of the brake lines and restored (thanks white post) cylinders on my 85LS fire engine. What type of Brake fluid should I put back in it?? Quote Link to comment Share on other sites More sharing options...
CaptainCrutch Posted January 16, 2019 Share Posted January 16, 2019 (edited) I would request a service manual from the Mack Museum. It should include information like that and will help you with similar stuff in the future. If you give them the VIN they’ll also be able to send you information regarding your truck specifically and in some cases they’ll send you build photos. Edited January 16, 2019 by CaptainCrutch Quote Who needs a back yard when you could have a Yard?! Link to comment Share on other sites More sharing options...
firenut Posted January 16, 2019 Author Share Posted January 16, 2019 Oh my brother I have all of them... The problem is that they recommend SAE R71 fluid which I think is DOT 3, but want to make sure I ask the veterans on here first.... Quote Link to comment Share on other sites More sharing options...
j hancock Posted January 16, 2019 Share Posted January 16, 2019 DOT 3 brake fluid would be the closest to the original spec available today. DOT 4 could also be used and it has a higher boiling point. Both are glycol based. I would use the DOT 3. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
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