I am in the process of rebuilding the brake system on my Midget. I have not seen the need yet for R&R on the master cylinder and prefer to let sleeping dogs lie. I am replacing the rear cylinders and rebuilding the front calipers. Along with this effort, I will be switching from DOT3 to DOT5 silicone brake fluid. Yes, I know that there are pro and con opinions on this, but I ran my MGB for 20 years and 300,000 miles using silicone and still swear by it today.
Here is the question. Is there a preferred method for the change over? In the past, I simply drained the DOT3 and replaced it with DOT5. This obviously left some DOT3 residue. I think that I have heard someone suggest that after draing the DOT3, the system should be flushed with methenol. This would disolve out the the old DOT3 and any water. Blowing air through the system (using a pressure bleeder, brake pipes disconnected from the cyclinders) would cause any remaining traces of methenol to evaporate, leaving a clean system for the DOT5.
Does this make sense? Has anyone had any experiance with this? Is there a better way to do this? Or should I just do it the way I did it in the past - drain one and the add the other?
Here is the question. Is there a preferred method for the change over? In the past, I simply drained the DOT3 and replaced it with DOT5. This obviously left some DOT3 residue. I think that I have heard someone suggest that after draing the DOT3, the system should be flushed with methenol. This would disolve out the the old DOT3 and any water. Blowing air through the system (using a pressure bleeder, brake pipes disconnected from the cyclinders) would cause any remaining traces of methenol to evaporate, leaving a clean system for the DOT5.
Does this make sense? Has anyone had any experiance with this? Is there a better way to do this? Or should I just do it the way I did it in the past - drain one and the add the other?