54 chevy front brakes dragging

[jap901]

Once I start moving there not dragging once I go about 2 miles and 2 stop signs the brakes start dragging getting hot. can any of you help me figger out why the brakes are not releasing? Thanks Jim

 

[donsrods]

Sounds like the fluid is expanding and keeping pressure on the wheel cylinders. How is your master cylinder pushrod adjusted ? You should have some play in it. How many wheels are having that problem?

Don

 

[jap901]

both fronts do the same. I put new pads and wheel cylinders. It has power brakes but i dont have enought vacuum for them to work untell I get the ele vacuum pump hooked up. i do not have the rear brakes hooked up yet.

 

[Dirtyrat]

Without engine vacuum the return portion will also be inhibited... maybe that is the issue...

This page really diagrams it well, better than I could in words:

http://auto.howstuffworks.com/auto-parts/brakes/brake-types/power-brake2.htm

 

[jap901]

Thanks Dirtyrat. That may very well be it. I got A ELE vacuum pump thats pulls 16 hg vacuum do U know if it needs to run all the time or just when the brake applyed?

 

[Dirtyrat]

I've never used an electrical vac pump, but I have seen them on diesels I believe with a vac pump and canister.. I imagine it runs when it needs to based on a pressure switch?

 

[jap901]

The pump is new for a ford or dodge diesel truck. I have thought of running it by A presure/vacuum sencer. Thanks