Brake repair

[Chipwest]

I just purchased a 1966 M35 a2. The previous owner rebuilt the master cylinder. When I started the truck and pushed on the brake pedal, the pedal went about half way down . When I released it it came back up and was very stiff . Only going down about an inch or so. The previous owner thought maybe a wheel cylinder is sticking. Anyone tell me where I should start looking to repair the brake system. It has the short air pack and appears to only build about 60 psi of air pressure. Thank you in advance

 

[NDT]

When you reapplied the brake the second time, did the truck stop? Sounds like air is in the system. Oh and for sure fix the compressed air system such that you get 100 psi.

 

[nukem]

Maybe air in your airpack.

 

[Mullaney]

I just purchased a 1966 M35 a2. The previous owner rebuilt the master cylinder. When I started the truck and pushed on the brake pedal, the pedal went about half way down . When I released it it came back up and was very stiff . Only going down about an inch or so. The previous owner thought maybe a wheel cylinder is sticking. Anyone tell me where I should start looking to repair the brake system. It has the short air pack and appears to only build about 60 psi of air pressure. Thank you in advance

.
You didn't mention how long the truck might have been sitting. Six weeks? Six months? More?

You could have an air problem (you mentioned 60#) and it might just be water from condensation in the brake lines - that eventually flow downstream to the wheel cylinders (brake cylinders). Not always, but if the brake peddle seems really still - either a lack of air - or an airpack that is having trouble could be another thing to investigate. Bleeding the brake system should net you some fairly clear fluid. If it looks "rusty" that be the water mentioned before...

You can bleed the brakes by yourself. Make yourself a power bleeder from a weed sprayer.

Deuce Power Bleeder R4x4 Style

Gang, here are 2 pics of my bleeder. You can see that the tank line has a ball valve and a quick coupler from an air line. It then connects to a second hose that has a tee and a 6" nipple that screws into the MC cap. There's a plug in the top of the tee but eventually it will have a pressure...

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