James, I once experienced a similar failure on my 60 Buick. Pedal went to the floor seemingly held by vacuum. Pedal came up with engine off. Is your pedal returning with no vacuum, when engine is off,? Most master cylinders have a spring inside to bring it back. I see this external spring and bracket stuff when boosters or cylinders are wrong or poorly repaired. I see lots of Treadlevacs that way. Say whether the pedal is held by vacuum or gravity. Dab Sent from my Verizon, Samsung Galaxy smartphone -------- Original message -------- From: 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> Date: 1/22/23 1:12 PM (GMT-05:00) To: "Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx)" <chrysler-300-club-international@xxxxxxxxxxxxxxxx> Subject: {Chrysler 300} 300K Midland Booster I just went to pull the 300K off the rack, I have the steering all back in with the temp box. I went to back up and the brakes were locked.
The pedal did not return. Now I had the booster off. It looked like it had been rebuilt at some time in the last 20 years. There was some surface rust on the can and also some on the plunger. I took the can apart, just the two shells and I cleaned
everything on a wire wheel and gave the parts some zinc paint. Nothing on the inside. I put it back together and that was it. I reinstalled it after the steering was in.
Now one thing that has not worked well is the brakes since I picked it up. I do plan on an entire rebuild, but that is after the steering. There was a funky return spring and bracket on the brake pedal arm that I took off. It did not seem to
affect anything. But now I see why.
Anyone have any ideas? The service manual does not have anything on pressing the pedal down and and it staying there. I can pull it back with my foot.
I doubt it is the MC but anything is possible.
Help!
James
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