Aluminum brake master cylinder.

[cudaneil]

Hi Guys,
            My 72 cuda is fitted with a gold aluminum master cylinder with a black plastic reservoir with 2 screw on caps.

            I dont have a power booster, and this cylinder is a newer upgrade fitted by the previous owner.

            After about 10 applications of the brake pedal, the damn thing overflows out of the filler caps !

          Now at first i thought the reservoir was overfull,but the level is now down to halfway,and it still overflows.

           Must sort this out soon as my paintwork is being damaged by the brake fluid     

[GoodysGotaCuda]

First off, it may be worth your while to swap out to DOT 5 brake fluid before risking your paint too much. I have one of the plagued gold aluminum master cylinders that a moparts member was selling a few years back. MANY people had problems with the caps sealing. I tossed the caps that were on there, in favor of factory ones off a junkyard car. Pretty much solved my problem with the caps leaking. Many people had/have problems with those distributed out of a certain batch i guess...

[cudaneil]

Thanks,
           thats good news in a way, it means i only have to change the caps !

          The bad news though, is that i won't find replacements here in the uk.     

[HP2]

Those same caps were used on a large number of Chrysler econo-boxes through the late 70 and through the 80s. I don't know if that would help your odds of locating any. There may also be a comparable type master cylinder used on any number of asian cars from the same period of time.

[cudaneil]

    I dont think we have any 70/80' s   cars still in the breakers yards............they will have been crushed by now !

    Its not like the USA  here  im afraid !!!

[GoodysGotaCuda]

I can get you all the caps you need if you are willing to buy shipping? Via paypal or the like. Might as well grab a couple sets to make sure you get the best shot at getting it sealed up.

[bb71challenger]

Are these the same master cylinders that Ebooger is selling on Moparts? I have been wondering how good they are.

[moparniac]

First off, it may be worth your while to swap out to DOT 5 brake fluid before risking your paint too much. I have one of the plagued gold aluminum master cylinders that a moparts member was selling a few years back. MANY people had problems with the caps sealing. I tossed the caps that were on there, in favor of factory ones off a junkyard car. Pretty much solved my problem with the caps leaking. Many people had/have problems with those distributed out of a certain batch i guess...

I have the same one.. lol hasnt leaked yet but it just got put on....

[422STROKER]

Count me in as one with damaged paint from these POS M/C caps.

Tom

[bb71challenger]

Well that settles it. When it comes time I will be using silicone Dot 5 brake fluid. My car is just a driver and will never be a show car but I dont want paint getting eaten off of it because of a brake fluid leak   

[73challenger_TN]

I have had that problem. I had a chrome cover on my master cylinder right after paint. It looks HORRIBLE now...

[cudaneil]

 
               THANKS FOR THE OFFER GOODY................................But i just found out something from a supplier!

                  He has admitted that there was a problem with some of the reservoir caps not sealing,and says its only

                  because the sealing surface under each cap on the actual reservoir neck is not flat.

                So you just get a small block of wood and some abrasive paper and sand them flat. Im having a go at it !

               

[MEK-Dangerfield]

I just put a chrome cover on mine today. This is attempt #2. I'll know for sure when I take it out this weekend for some fun. So far it works pumping the pedal while sitting in the garage.   


     To be continued..     

[GoodysGotaCuda]

               THANKS FOR THE OFFER GOODY................................But i just found out something from a supplier!

                  He has admitted that there was a problem with some of the reservoir caps not sealing,and says its only

                  because the sealing surface under each cap on the actual reservoir neck is not flat.

                So you just get a small block of wood and some abrasive paper and sand them flat. Im having a go at it !

               

Whats keeping the plastic shavings from going into the small orifices in the master cylinder though? Be careful!

[bb71challenger]

The more you guys tell horror stories about leaks the more I am leaning towards just putting a stock cast iron one back on.