1964 Chrysler 300k brake upgrade

Brakes, Suspension, Rims and Tires

  1. Drew-Pritchett

    Drew-Pritchett Member

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    I'm looking to upgrade my booster and single master cylinder while I'm changing out my steering gear. This claims to fit my 4 wheel Drum set-up.

    Does anyone have any advice on the matter? Is this just a straight bolt on with nothing else needed? As always, thanks guys! Screenshot_20200522-163917_eBay.jpg
     
  2. Drew-Pritchett

    Drew-Pritchett Member

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    Btw my current setup is the factory power brakes 4 wheel drums
     
  3. mikedrini

    mikedrini Active Member FCBO Gold Member

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    Drew,

    It will not naturally fit. I've tried a similar setup in the past, so trust me on this. I bought one similar to the one you're looking at and the arm on the back of the one you're thinking about is different than ours. Mine is a pushrod into the brakelight switch. The one you posted above is a bolt-on. You will also need to do some fabrication on the firewall and booster backing plate as the holes do not naturally mate.

    Honestly my advice would be to either have the brake booster redone by Booster Dewy (if it's in bad shape). If it works, leave it and do what I did, upgrade the front brakes to discs and swap out the master cylinder for a dual master cylinder. Much easier.

    Be aware, others will point out your current brake booster is for power drums, NOT disc brakes and they are correct. Disc brakes use a different booster. The problem is that those boosters are hard to come by in my experience. Our 64's are a rare breed since they are technically not C bodies and while the appropriate disc booster from an actual C body is desired, it may not fit our model naturally.

    My setup has worked for me. If you purchase what you're looking at above, it will be a colossal pain in the ass to install and is not a natural swap. Fabrication will be required.
     
  4. Drew-Pritchett

    Drew-Pritchett Member

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    Thanks mike! Yeah my current one works fine. Just needs to be cleaned up.

    So, with that being said, can I go ahead and upgrade to a dual master cylinder? I plan on upgrading to disc in the front in the near future.
     
  5. Davea Lux

    Davea Lux Old Man with a Hat FCBO Gold Member

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    You would also want to check the spec sheet on the after market booster as a lot of those kits are designed to upgrade from manual brakes. They do no play well with a car that was set up with power brakes as the pedal pivot points are different and things do not mate up. I would rebuild the current booster and do the dual pot master cylinder conversion and let it go at that as noted above. The after market conversion booster is an 8" booster and most of the C-Bodies used a 9" booster so you are not going to gain a lot over what you have by doing the conversion.

    Dave
     
  6. mobileparts

    mobileparts Well-Known Member

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    That is NOT NOT a 4 wheel drum brake master cylinder, for starters....
    Notice the chambers are NOT the same --- that is a Front Disc / Rear Drum master Cylinder --- and the power brake booster is some garbage Universal something.....
    Clearly, NOT what you want........
     
  7. pomonamissel

    pomonamissel Senior Member

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    why not just put a 67 master on your booster , if your booster is bad rebuild it , and run new brake lines and a 67 up drum brake front to rear balance valve . no need to charge the whole world there . i have a 64 300 k ht myself .
     
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  8. Drew-Pritchett

    Drew-Pritchett Member

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    Thanks guys. Think I'm gonna find a dual MC and just rebuild this booster.

    Any suggestions on a master cylinder?
     
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  9. Davea Lux

    Davea Lux Old Man with a Hat FCBO Gold Member

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    Use the '67 master cylinder for drum brakes. Buy a new one as a lot of the overseas rebuilt units are crap, stay with a Raybestos, Wagner or OEM Mopar.

    Dave
     
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  10. pomonamissel

    pomonamissel Senior Member

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    67 up . the smaller the bore the more brake power , but the more travel the paddle most go . so if your okay with the stopping of it . then get the same size or a 1/16 smaller max .
     
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  11. Drew-Pritchett

    Drew-Pritchett Member

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    Is the booster rebuilt something easy to do with a kit or is it something best left to the professionals? I'm a moderately good mechanic (rebuilt suspensions, installed engines and trans, etc etc)
     
  12. Davea Lux

    Davea Lux Old Man with a Hat FCBO Gold Member

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    I would send it to a pro as the kits are almost as expensive.

    www.boosterdeweyexchange.com does a really nice job on rebuilts. Avoid Cardon't rebuilds like the plague.

    Dave
     
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  13. Drew-Pritchett

    Drew-Pritchett Member

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    Thanks dave!
     
  14. mikedrini

    mikedrini Active Member FCBO Gold Member

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    I've heard Harmon Classic Brakes does good work too if you wanna shop around. As for the front brake disc conversion I went with Scarebird. I think I bought a set for a 64 dodge 440? At the time he wasn't sure if his kit would work on a 64 NY, so I took a chance and it worked. The biggest difference with our pre-C's is the spindle setup.
     
  15. pomonamissel

    pomonamissel Senior Member

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    power brake exchange is who i've been using .
     
  16. mobileparts

    mobileparts Well-Known Member

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    Anyone who has an Original Mopar will want $ 750 or more for it --- and for a non-original car, that is a serious waste of money....
    Wagner and Raybestos are Chineseum sell outs -- when you get it if you are so inclined, you will read
    Made in China right on it.....
    You can call me for an alternative -- Craig --
    516 - 485 - 1935......
     
  17. mrfury68

    mrfury68 Senior Member

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    The Chrysler name is misspelled in the ad. That alone would scare me off. There is no "t" in Chrysler. :confused:
     
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  18. Davea Lux

    Davea Lux Old Man with a Hat FCBO Gold Member

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    Maybe something about the translation from Chinese?

    Dave
     
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  19. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    If your booster needs to be rebuilt, send it to Booster Dewey as has been said.

    You can get a master cylinder from a '67 and up drum brake Mopar. If you need something to tell the parts counter guy, use '68 Chrysler 300 or something like that. The bolt pattern is the same. You might need to do a little plumbing work with a tee. I did a conversion on my '65 Barracuda and I had a kit with a tee that looked like this one. This says the application should fit your car.

    https://www.inlinetube.com/products/blk241
     
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  20. CBODY67

    CBODY67 Old Man with a Hat

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    The pictured booster, plus the "dual" notation, would be a dual-diaphragm booster, which would be for power disc brakes.

    Changing the lines and m/cyl to a '67 C-body item would be the easiest way out. The "balance block" probably refers to the block that triggers the "BRAKE" light when one axle-set of brakes might lose pressure? Not sure how to wire that in on your car, IF that's all it does.

    Just some thoughts,
    CBODY67