I'm going to be doing a brake job on my truck. Not just all new rotors and pads, but I found a stainless steel brake line kit and plan to flush the fluid with all new. Just hitting 70k miles on the all original brakes and trying to get a bit better performance for towing. I've done pads and rotors before, just not lines or tried to flush a brake system.
Here are my concerns:
1. The new fluid I bought is DOT 4. My truck calls for DOT 3, but I've read that the two are somewhat OK to interchange. My goal here is to completely flush the 3 the best I can and just run the 4. What harm, if any, could this cause?
2. The key is to not let the master cylinder run dry, am I right? For if it does bad things can happen? How can I do this when I pull the brake lines off? Am I going to run the system dry, or will the fluid stay in the master cylinder even though I pulled the lines off. The stainless lines just replace the rubber hose to the caliper from the hard line.