Brake pulse back

[DieselDW]

Recently my brakes pulse back when I hit the brake pedal right away on. 2006 Sierra 2500. Does it every time if I hit it suddenly or coming up to stop light. But if I lightly or slowly push it doesn't happen. It weird that is just pushes back right away. Brake pedal seams stiff while pushing prolly because I have also been testing it out while driving. I did just put a new power steering pump in and my brakes were fine for a week after that. This just started happening within last couple days. I also just had a fender corner re done on the truck and I'm gonna call the body shop and see if they took any brake components off when they took tire off if they did.

Anything I could look at or anyone know what it is?

Thanks

 

[jliddle]

Hydroboost needs replacing.

 

[TheBac]

I would first check for ABS codes and if all ABS sensors are working correctly. Might be a good time for brake servicing anyway.
I would then flush the hydroboost and see if that makes an improvement.
Also, check for fluid leakage at the seam where the hydro meets the master, too.
If no leaks, the flush doesnt help and the ABS system is fine, then replace hydro.

 

[DieselDW]

Sorry for the long wait on reply. I just flushed the hydroboost and the problem still exists. I have no codes being thrown at the computer but still have to get the front jacked up to check ABS and hubs. Nothing around the hydro is leaking. I will say it seems to have gotten better a little on its own but if it is the hydro then prolly going to be going out I would guess