Tahoe, Brakes

[Frank33]

2004 Tahoe,,Power brake quit working ,,Full of fluid ,,still has brakes ,, Takes all my power to stop

[Blue Bowtie]

Does your Tahoe use the Bendix Hydroboost system or a vacuum power booster?

[Frank33]

Have no Idea ,, It's a Z71 ,, Just bought it and yesterday all was fine

[Blue Bowtie]

Open the hood and look. If the booster has the familiar 12-14" round drum behind it that would be a vacuum booster. If the booster is no bibber than the master cylinder and has two power steering pressure lines connected to it, it's a Hydroboost.

[Frank33]

I'll check it out 1st thing in the morning

[Frank33]

Just checked ,,,It has hydro boost System ,, Checked PS Fluid It's a little low ,, Barely to the first mark on the Stick..,, Plenty fluid in master Cylinder ,, Topped off PS fluid ,, Drove it around a lttle ,, Didn't help

[rhandwor]

If you need to replace from past experience on 1 ton Chevys you will find you need a special tool.
http://www.ebay.com/ Search items 281581322518,322132077014,272116766901
As Blue Bowtie has done this model ask him which one will fit.

[Blue Bowtie]

If this vehicle is a 1/2T or 3/4T chassis it may not need the K-M tool because it likely uses the staked-in pedal push rod and standard MC push rod. It could be a matter of loosening the MC nuts to slightly move the MC out of the way, removing the pedal rod clip, then R&R the HydroBoost unit.

Unfortunately, they aren't inexpensive, but brakes are a good thing to have.

[Frank33]

Replaced Hydro Boost system ,,, Worked fine for 20' ,, Back to hard brakes no assist

[777stickman]

Could it be the power steering pump??

[Frank33]

Power steering works fine ,, No noise from pump Wheels trn Lft & Rt no prob ,,Fluid full can find no leaks ,, Do you need to bleed Hydro Boost System ??

[777stickman]

You need to bleed the power steering system as that is where the hydro boost gets its energy.

You might consider a new master cylinder next.