BAC Forum

General Boards => Technical Support => Topic started by: Frank Bannert on November 09, 2011, 01:52:48 AM

Title: Brake fluid
Post by: Frank Bannert on November 09, 2011, 01:52:48 AM

Does anyone know if you mix synthetic brake fluid with the regular Dot 3 if it will hurt any of the components or do any damage. Also what is the capacity of the system.

Thanks Frank

Title: Re: Brake fluid
Post by: Karl Welhart on November 09, 2011, 09:33:02 PM

It would not be good idea to mix Dot 5 with either Dot 3 or 4. However, you can use Dot 3 and Dot 4 interchangeably). The piston seals could be damage as a result of this mixing.  Additionally, in an old motorhome that has not started it's life with Dot 5, brake hose lining could be damaged as a result.  During the early days of the disk brake recall for Bosch calipers, this Dot 5 mixing with Dot 3 was claimed to be part of the problem.  I have heard from several mechanics that they saw a sludge come out of brake lines that during the recall campaign.