I am going to change my MC as it fails to hold the pedal and I must pull back the pedal.The 2nd owner put on a dual MC for 1967 for saftey in 1990 with the correct prop valve.
So are there any tricks to make this easier as I will be doing this myself.When I disconnect the lines from the MC will the fluid leak out?
Is it just taking the 4 nuts of from inside the car and the MC will come off?Do I need to disconnect the pedal or the rod hooked up the pedal.


Thanx.If more info is needed from me just ask.Thanx...


Having trouble DL pics.Will try again later.

disconnect the rod at the pedal, the 4 nuts and have a rag under the MC as it will drip some fluid when you undo the lines. then use your vise to take out the pushrod. Make sure your new M/C has the recess for the pushrod retainer & if a new rubber retainer is not included in the M/C box you can cut a piece of vac line.

Even if the MC is bad, the pedal should return to the up position. Start by checking the pedal linkage to be sure it is not binding and that it returns all the way to the stop. A lot of MC's have been changed due to linkage problems.

Take the seat out so you have room to work. Pull back on pedal to free pushrod from cylinder. You may have to remove brake switch. Remove lines from cylinder and mounting nuts and you'll be there. Get fluid out first so you dont make a mess.

I would at least break the MC lines loose prior to removing the nuts that hold it to the firewall. You will lose some fluid no matter what. If it was me I'd have the master all ready to go (bench bleed it) an install is as soon as the old one came out. If you are worried about getting brake fluid on the paint cover up the fenders and surrounding areas. Make sure the cap is secured when you pull the thing out too, it should only leak a little from the fittings.

Gonna be doing this sunday or monday...I think I got my pics to work..

The spring by the brake pedal...

The Master cylinder..

be sure to bench bleed teh new master cylinder first. this will save some aggrevation of doing it on the car. just a personal pref.

OK,so the 4 nuts are off.Do I have to unhook the rod at the pedal or can I pull on the MC to get it out .Don't want to pull if I am going to break something...

Had to take the rod out with the MC as I could not pull rod out of the MC.Took the back of the old MC off to get to the rod and this is what I have.How do I seperate the rod.Can I just pull and it will come out...

you should be able to pull it out with the assembly in the vise - in the instructions that came with mine it said to go ahead and disconnect all the linkage, etc. but then at the very end it said "if you have a chrysler car with a "pop-off" rod, leave linkage attached, loosen master cylinder, and pry it off the rod" - well, it maybe would have worked, but it was too late, so i got it pulled out using a vise as mentioned. install new rubber and gasket, and install - i got the rod to pop back in just by tightening the master cylinder to the firewall

Got the rod out and have put the whole thing back together.....I bench bled the MC like it said till there was no air bubbles.The pedal does now return to the top but the pedal goes all the way to the floor.I am going going to bleed the brakes in a few...

So I bled the back---fine.Now the frt,,,,,,I hooked my vaccum pump up to the pass.frt and very little fluid came out,then none.If I pump a few times and un hook the vaccum line you here the suction noise.On to the driver side,nothing,just creates a vaccum.I attached the pump to the brakeline before the hose which attaches to the cylinder and again very little fluid,then nothing..So it seems as though something is clogged or blocked from the MC to the prop valve,,,,,I guess.....Any ideas.

The frts are drum also.
I took off the frt brk line at the MC and pumped the brakes and fluid came out so I know the MC is working.I'll check the valve tommorrw.

Update..There is no pin on the valve.I took all the frt lines apart and blew air thru them and all is clear.Put it all together and same thing,no fluid and makinga vaccum.So I took the rear line off at the MC and pressed the brake pedal and fluid came rushing out,put that line back on and took off the frt line and pushed the pedal and barley anyfluid came out.So now I am thinking the MC is bad???????