Flush and fill brake fluid

[hesermon]

Next month I'm taking the TTA to a SCCA sponsored event where I will on a 1.6 mile,9 turn road course. I was strongly advised by the safety director to "completely flush and refill" my brake fluid if it is more than 5 years old. Is there an easy way to completely drain and flush the lines and is DOT 4 fluid the best choice or spend the money for DOT 5?
Sounds like a great time but I really do not want to alter the aerodynamics of my car, being able to stop is the only thing MORE important than going fast.

 

[dsmith4994]

more brake bleeding questions

I also have a few brake bleeding questions:
1) Do you put the clip on the proportioning valve for just the rear or both front and rear brakes when bleeding? Which end of the proportioning valve does the clip go on?
2) Do you need the clip on the proportioning valve at all if the master cylinder and proportioning valve is already bleed and you are just flushing fresh fluid through the system?
3) Manuel brake bleeding versus mighty vac or other mechanical bleeding system as it applies to the first two questions
Also any other specific things to know about the mechanical bleeding process as i do this alone most of the time with the mighty-vac tool such as should the brake reservoir lid be off or on when mechanically bleeding the system? How to get all the air out of the system as it applies to the first two questions in a timely manner? The mighty vac seems to evacuate air in the form of bubbles for a very long time. Any way to speed up this process? Any better tools? ...TTT......Would love to make my car stop as fast as i can make my car go.....

 

[joey316g]

quick fyi on the mighty vac. The bubbles can be misleading...sometimes its air pullung past the threads on ther bleeder. Take the bleedere out and put a little grease on the threads and then reinstall. Keeps the air from pulling past the threads. Generally, if you pull out enough to fill the cup on the mighty vac half way, that should be plenty. Leave the brake resevoir cap off. Just dont suck down to the holes in the bottom. Do closest wheel to resevoir to farthest wheel.

 

[chopped39]

My buddy uses dot 5 in his road cars. It is full synthetic. As for bleeding I would use a power bleeder that forces it through the system with 30 psi. Most shops have the ammco bleeder that plugs right into the the reservoir and forces fluid through. I just use the vacula bleeder for drain and fill but thats putting the same type of fluid back in. I would have it flushed out with a power bleeder with dot 5 .Have fun and good luck.