NO BRAKE PRESSURE AFTER ALMOST FULL SYSTEM REPLACEMENT!!

[BabyD]

Hello everyone, I recently came into my single cab after 17 years of being parked.. I've replaced hydroboost, ps pump, master, calipers, pro valve. STILL NO PRESSURE! pedal depresses maybe 2 inches and then I have to put my whole rear into it just for one of the fronts to start to engage. I disconnect lines at master to bench bleed and everything feels as it should but as soon as the lines are back hooked up same brick pedal, almost feels like pressure is blocked somewhere but where? Someone anyone please send some Intel my way I've been at this since Jan with no prevails, thank you all in advance for any info that may help.

 

[KWMECH]

So does the booster seem to be working? Do you feel this is a booster problem or an actual hydraulic brake problem. Air bubble still in booster, Power steering working? . I had an issue years ago where I had inadvertently switched the return hoses to the ps pump. Proportioning valve off center? collapsed hose/s? Push rod between master and booster out of adjustment? Just throwing things out there

 

[Finkaire]

Brake line hoses, maybe? Not exactly the same problem but it fixed mine.

 

[CountKrunk]

Did you do all new lines? How are the brakes at the tires?

 

[Grit dog]

Parked 17 years can do a lot of damage.
You don’t mention replacing brake hoses or checking the lines.
If it feel like the fluid is dead ending before the calipers, it probably is.
And you mention nothing about rear brakes. Those are likely fubar too.

 

[Ricko1966]

Hard pedal would be an indication of no power brakes not low pedal or soft pedal. Did the brakes bleed correctly? Was the truck originally equipped with power brakes.Did you check clearance between master cylinder and booster pushrod(.020). If yes to all three,my first assumption would be rear brakes way out of adjustment.

 

[Ken B]

I have the same brake issue.
Rear drums all new. Front pads replaced . Master cylinder replaced with the addition of a booster....didn't have a booster b4...doesn't feel any different. Still standing on the pedal to stop....

 

[Ricko1966]

I have the same brake issue.
Rear drums all new. Front pads replaced . Master cylinder replaced with the addition of a booster....didn't have a booster b4...doesn't feel any different. Still standing on the pedal to stop....

What do you mean didn't have booster before.non power brake converted to power brake,you have to relocate the pushrod on the brake pedal. Different pedal ratio,non power vs. Power brakes.

 

[Ken B]

I am questioning whether this was done or not..

 

[Ken B]

Ricko your knowledge and willingness to assist is greatly appreciated

 

[xm20k]

Says hydro boost was it bled correctly they take a whole procedure that needs ran thru multiple times sometimes. My swap to hydro took running thru the bleed process like half a dozen times with an hour in between each cycle for the air bubbles to dissipate.

 

[Ricko1966]

I am questioning whether this was done or not..

Is your pedal too hard? or lots of travel?

 

[Ricko1966]

https://www.gmsquarebody.com/threads/project-is-stalled-cannot-solve-brake-problem.45716/#post-967906

 

[Ken B]

Pedal is hard and I gotta stand on it like there is no booster. ..I drove it forever without a booster....I recall how hard the non booster leg had to work .

 

[Ricko1966]

Pedal is hard and I gotta stand on it like there is no booster. ..I drove it forever without a booster....I recall how hard the non booster leg had to work .

Okay you have a legitimate booster problem start a new thread so we don't hijack this one.