just for clarifications sake, i should loosen the front brake line on the master cylinder, not the front line on the valve housing, right? my rear brakes were leaking fluid.

 

I believe you are right. The LARGER cylinder cup is for the disc brakes. Its the one in the front. The furthest from the brake booster unit.

 

On my 81 F150, the larger cup, for the disc brakes, is located on the rear section of the master cylinder, close to the booster.

 

mine also... Big one closest to the booster


Before you drive it again, u need to see if the brakes are functioning properly... If not, in addition to being stupid and reckless, you're setting yourself up for a lawsuit... I mean absolutly no offence, but theese trucks arent light, or wimpy. You can kill people with a geo metro, but you're in a tough f-series pickup... The danger is to others...


It's really easy to test if they're working properly, it's a two idiot job though (one to step on the brakes, the other to try and turn the tires)

Here's a really quick walkthrough, it's very simple, and I hope I dont insult you by posting it... but i feel strongly about brakes, so, here goes...


I usually reccomend jackstands, but for this, it's not nessisary because you're not going under it...

Jack up a corner of the truck, and turn the wheel in both directions... Check for catching, binding, dragging or scraping... SOME scraping is acceptable, but it shouldnt be hard to turn. Then have someone step on the brakes, and see if it stops turning (in both directions)

And, because it most likely needs it, I say replace all of the brake fluid. Suck almost everything out of the master cylinder, and replace it with fresh stuff... then, bleed the brakes a few times...


Good luck, I spent around $400 fixing mine... They're brand new right now... brand freekin new.... It doesnt run good, but it sure as hell WILL stop good

~Nate

 

Brain farts here. YOU ARE RIGHT. The larger disc supply is in the back of the master cylinder. Had to make me go look, didnt ya?