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Guys I need a little help,

I have a 1941 Packard 120 I drive just about every day great fun. I was going through my normal fluid/suspension bolt/leak check and noted a small leak at the brake pressure switch so I replaced the switch and bled the brakes. After which I noted on the test drive you can depress the peddle only to feel resistance (as normal) but a slight pop in the peddle then it goes down another 10%. check all suspension seems tight appear to be coming from the driverside left lower area which is either a master cylinder or the drum brake on that side. The car doesn't pull to either side when this happens just a slight pop then peddle travels 10% further I'm thinking it's a master cylinder but wanted opinions?

4 wheel drum stock brakes

checked peddle linkage through the movement ok...
check suspension ok
bleed brakes 3 different times thinking air got into the lines
peddle feels firm car stops well

thanks for replies.

Vintage


Check the adjustment of the shoes. You may have to take some drums off to look around. Sounds to me like wear requiring adjustment or repalcement of parts

Regards


John Harley

John is absolutely right.

This happened to me. It's kind of scary. You press the brake peddle, it feels normal, but if you press more, it pops, drops an inch or more, then holds.

One brake shoe if off its position. (mone was at the top of the front shoe) . When you apply enough pressure, it pops it off where it's hanging up, forces it into the groove where it should be, and the brake holds.

PRobably a sludged up sticky wheel cylinder. Since no SYmptom of puling to one side or the other is reported then most likely a rear wheel cylinder. Maybe both rears.

Pulled the front drums off sure enough both the shoes appear to be shifting excessivly shinny area on the metal backing gave it away. After looking the brakes over well I noted the center peg that holds the springs had shifted to the high side causing the shoes to expand way to high. turns out the nut on back backed off the lock washer just enough to cause it to turn. Tightened her down adjusted the brakes went on several test drives problem solved.


Thank you all for helping with advice...


God bless