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Old 01-13-2014, 09:32 PM
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T Bucket brake system questions

Hi everybody. This is my first post here at HotRodders.com.

I just bought a well used T Bucket a couple of weeks ago. I want to replace the leaking master cylinder, but can't find an identical one. I believe my brakes are from a late sixties GM, perhaps a G10 van or Chevelle, big drums all around.

I bought a new GM late sixties dual reservoir master cylinder that I thought was appropriate for those brakes, but it's very different than the one that came with the car - the ports are 1/2 and 9/16 rather than 1/2 and 1/2, there are no residual valves, other minor differences. The bore is the same, one inch.

Will this be ok to use? There is currently a combination valve on the car. If I remove it and replace it with some residual valves and hook up some sort of brake light switch, and perhaps a proportioning valve if necessary, should it be ok? I'm kind of concerned about the difference in port sizes, between the two master cylinders, what effect would that have?

Also, I noticed that the proportioning valves like the ones from Speedway are only 1/8". I'm surprised that it works ok to put something much smaller than the rest of the tubing on there, but apparently it is. How important is line diameter? Thanks for any and all help.

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Old 01-14-2014, 08:24 AM
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Your drum brakes will require some sort of residual pressure. I would not be to concerned about the port sizes on the master as long as they will seal on the 3/16 line.
What you may be seeing on the residual valve port sizes is the thread size not the actual through size. thread sizing is kind of convoluted. As long as the master cylinder bore size is the same and the residual valves are installed the brakes should work the same as they did before.
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Old 01-14-2014, 01:32 PM
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i'm on board with T23.. with the exception of the residual valve. on both of my T's i did not use any valving at all. had no problems.. last T i used an early duel m/c from a ford ranger and worked fine.. i also had disc front and drum rear. just T in a fitting and screw in the lite pressure sw .
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Old 01-19-2014, 10:26 PM
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Thanks for everyone's help. The m/c I mentioned in the first post wouldn't work because the ports were on the wrong side. I ended up getting a universal m/c from Summit. I think it's based on a mid-sixties Vette m/c. Nice thing about it is that it has ports on both sides. I also got a couple of residual valves and a proportioning valve. Not sure if I'll really need the proportioning valve, but it was only about $40 and I figured it would be a good idea to use it to really dial in the brakes properly. Haven't installed this stuff yet, but I expect good things.
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Old 01-20-2014, 05:08 AM
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You'll find this site very informative in regard to residual and prop valves. Hot-Rod Internet Builder page
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