Brakes shoes slow release

[Robin Strong]

I've been having problem with brakes showy retracting.
I've rebuilt the air pack and master cylinder and power bleed system. Had good flow no leaks and all fittings are secure. Installed new brake peddle retention spring, was missing.
All that is left now is wheel cylinder. Next is cheap and adjust shoe clearance.
Be worth while to rekit if cylinders not to far gone?

Thanks in advance for worthwhile responses.

I'm confident that Air pack and master cylinder are done correctly.

 

[NDT]

If your hoses are OEM from 1966 etc they could be swollen inside causing restricted flow.

 

[Robin Strong]

If your hoses are OEM from 1966 etc they could be swollen inside causing restricted flow.

Even though good flow when power bleeding?

 

[GopherHill]

I does happen, more pressure when applying brakes overcomes the restriction. I've had it happen on 2 different vehicles.
TomC

 

[Crazyguyla]

Even though good flow when power bleeding?

Yes, they work fine under pressure and collapse internally when pressure is removed.

 

[18operator]

It has happened to me also. More pressure when applying the brakes opens up the flexible hoses. When brake applying is released the hoses swell shut holding in hydraulic pressure at the wheel cylinder, almost like a line lock.

 

[Robin Strong]

I'm sold.

Thanks for all the great advice.

Best regards to all

 

[frank8003]

It would be wise do renew or refurbish brake cylinders especially if one does all the work to get to them.
The brake cylinders work best with the proper rebuild parts, lots of information here in SS about that.
Also check to assure it is all working as per design when you get it apart. I can send to you videos and such in the email but can not attach those files in SS.
Send message, I will send the videos.

New Wheel Cylinder Issues

There is a service in ontario that will machine your cylinders and press in a brass sleve. Use silicone brake fluid , lube up all your seals with sil-glide or equivalent silicone rubber grease prior assembly and never worry again. Oh and a touch of copper anti sieze on the EXTERNAL threads of...

www.steelsoldiers.com

 

[frank8003]

important stuff

Finding the "good" wheel cylinder kits...

Does anyone make the "good" wheel cylinder rebuild kits for the Deuce anymore? The ones with the cup expander springs? Even on the surplus sites, all I see are the straight springs. Did a search for UP45 through NAPA and it comes up with nothing. What about the whole cylinders on the surplus...

www.steelsoldiers.com

try search military truck wheel cylinder kit in the online auctions

 

[Robin Strong]

Ok thanks

 

[cattlerepairman]

This post also has a few tips. https://www.steelsoldiers.com/threads/brake-frustrations.198123/

Can't hurt to remove the splash plate of the MC lid and also check with a flashlight that there is a vigorous stream of brake fluid returning to the MC when the brake pedal is released. Should see the brake fluid well up in the reservoir. Return hole is at the bottom, fairly far to the rear, if memory serves.

 

[Gypsyman]

Robin,

Did you find the cause? I'm having a similar issue with my '87.

Richard