Tucker Foot Brake Sticking

Track Addict

Bronze Member
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Here is the final info that I have found.

Original Part=GM #3773856 1 1/4" Brake Bore 1 1/8" Clutch Bore
I could not cross this to anything but that is the casting number.

Raybestos MC19089 1 1/4" Brake Bore 1 1/4" Clutch Bore
Raybestos MC34404 1 1/8" Brake Bore 1 1/8" Clutch Bore

Centric 130.80018 1 1/4" Brake Bore 1 1/8" Clutch Bore
This would have been off an early 60's C80 or 2 tonish truck.

The Centric part is the correct one but... Centric option is 150$ as well as any other option with 1 1/4" dual bores if you wanted to make the case to step up the clutch bore. These are also not a readily available.

I think the wise experienced Sno-Drifter has already learned a few things for us and is passing it along subtle. The Raybestos MC34404 which has dual 1 1/8" bores is a readily available part and costs under 50$ or 1/3 of the Centric option. Quite possibly the reduction of brake bore size is an improvement due to allowing for a longer pedal throw and could reduce the sticking issue?

That sounds like the way to go. How about the fluid? Brake fluid or other option like ATF?
 

DAVENET

Bronze Member
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I used Centric #130.80003. But my foot brake is ’inactive’. (not there). $46 at carid.com
 

HankScorpio

Member
I tried ordering the master for the light duty truck. It had both bores the same size. Everything bolted right up and then didn't work. The hydraulic ratio was wrong and I ended up pulling it out and ordering the 2 ton one with the 2 different bores. I was having trouble confirming actual bore diameters so I just ordered one to see what happened with the same reasoning that the pedal travel and feel would be just a bit different. It just plain didn't work. I still have the one that didn't work out in the shop, I can check the part #, I think its in a Raybestos box. I am travelling and won't be back until monday night to take a look. Get the right bores, even if it costs a bit more.
 

sledhead Ed

Member
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Brian putting a smaller bore mastercyl. for brakes will give you a lower and probably soft pedal. Putting in a larger bore than what it came with give you a higher pedal and [harder].
We used to put f450 masters on f350s to give it a much better pedal feel especially if you carried or towed a lot of weight.
 

Track Addict

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Verdict is in. The smaller bore master works. The cab is so tight it gives some more pedal throw I need to get my foot on it. Locks up tight!

Drifter making it great again!
 
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