Master Cylinder retainer??

Early C Bodies - The Slab Side Years

  1. Richard Reau

    Richard Reau Member

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    Hello gents,

    The brakes on the Newport have really been challenging. The rear shoes would not sit right, until finally I modified the leading shoe by about an 1/8" to allow the lever/bar a little more room to where it wasn't pushing the lead shoe too much. Now the rears sit nice and look great.

    The fronts were a bitch too. It took a few tries to realize that the 2.5" shoes I removed weren't right, but the 3" shoes were too big. So, I finally settled on the 2.75" shoes, and now the fronts look great.

    All brake pipes (lines) are replaced, so all parts are new. BUT, now there's an issue with the new master cylinder. The old unit came off OK, but there appears to be a "retainer" (spacer) between the booster and the cylinder assembly, which is shown in the photos. But on that retainer there is a thing called a "filter cover", which is a plastic piece that helps adapt the retainer to the master cylinder. My filter cover was in really bad shape. QUESTION: Does anyone know where this filter cover can be obtained? ALSO: The new master cylinder came with the pictured rubber piece, along with the little rubber ring. Does anyone know where these pieces go?

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  2. Badvert65

    Badvert65 Active Member

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    I can't speak for the plastic filter thingie, but the bootie and the small rubber thing is for retaining the push rod on manual brakes (pushrod from the brake pedal). If you have power brakes, you will not need these two items.
     
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  3. Richard Reau

    Richard Reau Member

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    Thanks Badvert, this has been another challenge...finding the correct master cylinder. The unit I removed had a lid that was retained by a bail wire, but every other unit I can find has a lid that is secured by a single bolt through the top of the lid. The parts stores have ordered BOTH the cylinders for power and manual brakes, and lo and behold, the units arrive and they are the same unit. What Gives?
     
  4. Davea Lux

    Davea Lux Senior Member FCBO Gold Member

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    The bail type MC is usually a disc brake master cylinder with split brakes.. What Year car is this? Most of the single bolt type dual pot Masters were used on drum brakes. If your car is a '66 or older model, with a single pot, those were usually single bolt units also. Need more information and a photo of your existing master cylinder.

    Dave
     
  5. Richard Reau

    Richard Reau Member

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    Thanks Dave, my car is a 67 Newport Custom, 4-wheel drums. The MC I took off the car had the bail type lid retainer. BUT, there is absolutely no evidence that any parts on my car were correct.
     
  6. Davea Lux

    Davea Lux Senior Member FCBO Gold Member

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    The type of retainer will not have any effect on the functionality of the master cylinder. Main thing is to be sure that both pots are the same size and that the piston diameter of the master is the same. Drum brakes use two equal sized pots, discs use one large pot and one small one.

    Dave
     
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  7. Richard Reau

    Richard Reau Member

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    Thanks again Dave, my biggest issue at present is finding this plastic piece called the "filter cover", which basically fits over the retainer (spacer thingy) that fits between the MC and the booster (see photos).
     
  8. Davea Lux

    Davea Lux Senior Member FCBO Gold Member

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    Try calling www.boosterdeweyexchange.com, they might have it.

    Dave
     
  9. FURYGT

    FURYGT Senior Member

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    Both style lids, bail and bolt on were used on Drum brake C Body cars in 67 & 68 depending on the supplier. The bolt on is more prevalent but both styles were used. The bail type usually had an anodized cover in my experience.
     
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  10. Richard Reau

    Richard Reau Member

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    I'll call Dewey tomorrow. One of their photos shows that very same retainer. Thanks again from steamy Tampa, Rich
     
  11. Samplingman

    Samplingman Senior Member

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    In my experience with the MC on the '70 was that the spacer and filter are used to equalize pressure. The way I understand it is if you push on the piston air has to be allowed in to equalize the pressure between the MC and the booster. This may or may not be the case for earlier models and may just be included in the new unit as a matter of course. The boot is just a dust cover for the piston rod on the pedal side.
     
    Last edited: Aug 13, 2019
  12. Richard Reau

    Richard Reau Member

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    Thanks guys for the input. AMS OBSOLETE to the rescue! Anthony had the new part in stock ($40), so it's on it's way from Fairmount to Tampa. I picked up some other things too, so hopefully next week the big red machine will be on the road. Hagerty did me a solid on the insurance, so all 3 cars cost me a total of $491 for an entire year, not bad. I'm ready to sell off my 1975 BMW 2002, but my wife is having none of that. I think the Riviera sprung a U-joint last weekend, so it's back under the car I go. When will this madness end?!

    I'll keep everyone posted on the Newport's "maiden" voyage. Cheers from Tampa, Rich