Posted by Ken (32.101.132.108) on April 10, 2001 at 07:30:57:
In Reply to: Junction block/Prop Valve posted by rickyracer on April 09, 2001 at 22:24:38:
: Brake systems are very misunderstood. Junction block only distrubutes the fluid to all connections. Since front brakes are closer and each have their own line they get more & fluid faster. Rear takes longer and spits cutting the pressure & volume in half.
: Disc brakes use a proportioning valve which has a differenial spring in it to control fluid flow to the closer but larger front disc caliber pistons. There by they get pressure first until it reachs a certian presure, Preset point depending on the spring, then the fluid starts to move toward the rear brakes. That's the real difference required for disc vice drum front brakes.
: Also remember that disc brakes use a clamping action and drum use a expanding action. Different braking methods. Drums work better when stopped to remain stopped and disc stop you quicker and better. Next week we'll talk Hydraulics 102.
: : Well I didn't mean for y'all to go at each other that way. But we did get some pretty interesting things going on. :-) Thanks for the help Gentlemen. I changed the junction block. I'll let you know how well it works when I get it done. By the way, my Son drives this car, I can't take any chances :-)
: : Thanks again
: : Willy
Distance from block has no bearing. The line in filled with fluid,
is non compressable and the rear or front is acted upon instantly
just like water in a hose or water out of your home facet.
Its also why air is bleed from lines to make the fluid instant acting.
Disc/drum combo need a proportion block for total different reason.