so Im upgrading the brake master cyl and the brake booster on my 79 s130 to 81-83 parts
the front lines on the new master cyl are reversed ie front section of the master cyl is running to the rear lines and the rear section of the master cyl is running to the front lines, Is this a problem or is the brake bias 50/50??

PS-in case its relevant Im running drilled and slotted rotors on all four

 

also now the pedal goes straight to the floor, thought we bled it properly, might need the pedal adjusted. There is a tiny amount of braking at the very bottom of the travel

 

why would you think the later style one is an upgrade?

just put the stock one back in.

 

its leaking, 79 part is discontinued, thats why its an upgrade
not so helpful, anyone else??

 

I don't have time to look through the FSM's right now to compare 79 vs 83 brake masters, but it shouldn't matter which lines come off the master, it's the proportioning valve that adjusts the pressure.

And if the pedal is hitting the floor, you still need to bleed the system. Start w/ the master, then open the farthest corner & pump until you have a steady stream of clean fluid. Then go to the other corners.

 

thanks, that was more helpful. will redo tomorrow then

 

pay dirt!!!

 

What is the status besides pay dirt... did you figure out how to bench bleed the master cylinder? That is you first step. Bleed it off of the car then install and bleed the brake lines.