No power brakes or PS

[tgtaylor64]

Really need some help. I've replaced the PS pump and the hydroboost unit. Still nothing. No leaks or blockages that I can detect. Jacked up front end and got the air out of the system while pumping the brakes and turning lock to lock per the TM.

 

[cucvrus]

What about the steering box? Are the outer axle U joints both free and not binding? I mean what made you replace the pump and brake booster?

 

[dependable]

Is it possible the belt that runs PS pump is really loose and not driving it?

I assume you are sure pump is filled to correct level.

Hoses hooked up correctly and not pinched?

 

[tgtaylor64]

What about the steering box? Are the outer axle U joints both free and not binding? I mean what made you replace the pump and brake booster?

The truck drives down the road, just with manual brakes and steering. The PS failed first; I replaced the pump. Then the brakes, I replaced the HB.

 

[tgtaylor64]

Is it possible the belt that runs PS pump is really loose and not driving it?

I assume you are sure pump is filled to correct level.

Hoses hooked up correctly and not pinched?

All good.

 

[dependable]

At this point I'd probably test pump output, and system flow in general, it would not be the first time a new part was defective.

One other, probably unlikely scenario, is that one of the protective plugs on a new component was not removed. Sounds bizarre, but I actually encountered this in a newly purchased vehicle that previous owner had sold mid-fix up.

That is all I can think of from here, good luck.