Master cylinder hanging up.

[qkcuda]

I disconnected the old single pot master today. I went into the car and pulled the brake pedal backwards, and felt the pushrod pop out of the master. I then removed the four nuts under the dashboard holding the master, and my hands look like mincemeat. When I went under the hood and tried to pull the master out it seems to be hung up. Is there something else I need to remove, or could the studs just be jammed in the support plate?

 

[Don Frelier]

Should just be the studs.
Just rip it out.

 

[qkcuda]

Thanks Don, I tried to pull it and pry it but it wasn't budging, then I had to take a break. Lying under the dash made my vertigo flare up. Hopefully I can get it out from under the hood tomorrow. I'm not ready to go back under the dash again.

 

[WileERobby]

I'd recommend changing to a dual-port MC.

 

[qkcuda]

Yep

 

[Don Frelier]

Just whack it with a soft hammer.
I hope your vertigo improves, an awful ailment.

 

[qkcuda]

Already whacked it with a rubber hammer a few times, but hard to get much of a swing at it. I took a couple of gravol and rested and am feeling better, thanks. I'll try again tomorrow.

 

[Don Frelier]

Try a metal hammer.

 

[qkcuda]

Or maybe a deadblow

 

[Don Frelier]

As Micheal Jackson might say:

 

[Tinker67]

If the rod is still in line with the master give your pedal a quick push.

 

[qkcuda]

OK I hate to admit it but I got back under the dash today and found the problem. I knew I had removed the 4 nuts. Turned out I removed one of the nuts for the reinforcement plate and left the passenger bottom nut on the master. Needless to say when I was prying on the master I bent the corner of the bracket. Oh well, I took the rest of the nuts off and now I can detail the reinforcement plate and paint the firewall underneath where leaking brake fluid had messed up the paint. I guess I am used to working on A bodies without the plate. That is my excuse and I am sticking with it.

 

[qkcuda]

I have already mocked up the new master and adapter plate. I used a universal bracket to mount the adjustable proportioning valve directly underneath the master.

 

[Don Frelier]

That looks pretty good.

 

[qkcuda]

I got the firewall straightened out and used a series of spacers and washers to pull the inner support bracket back into shape. I then cleaned up the rust under the old master and gave it a shot of paint.

 

[qkcuda]

Here is the final mock up of the new master.