178-1036 (19371361) Power Brake Booster Assembly

WOW! Amazing, the brakes stop my truck better than the day I drove it off the lot. Perfect fit on my 2005 GMC Sierra 3500. Recommend everyone upgrade their trucks!!! Watch You tube before attempting the change out. I did put one on a second truck. This time the transmission failed to shift. Although instead of drilling the shaft hole out 1mm, I disassembled the brake light switch and readjusted the contact,. One of three contacts in the switch, foreword most one. Now the throw is shorter and fixed the issue without drilling the hole. Just wear safety glasses as there is a spring inside the switch that may pop out and hit you in the face the first time you disassemble it. Seemed a bit overwhelming at first but, it was relatively easy once I got it apart. The brake light switch on the 2011 GM is a bit different than the 03-07 models. Very pleased with the result. I did order a second switch in case I failed, Now that extra sets in the glove box as a trophy reminder of the simple fix it was without drilling.

installed it 2 weeks ago on my 2003 GMC 2500 and so far so good. fits perfectly and works great

I installed this on my 03 sierra 2500HD. It fit perfect and the brakes feel so much more responsive than before. Like others have said, you may have to open up the hole on the shift that connects to the brake pedal. At first I did not but did in the end as I was trying to trouble shoot why my truck wouldn't come out of Park after everything was installed. Turns out I had damaged the brake switch when I was removing the 4 nuts under the dash. Be very careful with this switch and remove it fully so it does not get knocked around.Very happy with this product and would have been an easy install if I hadn't damaged the switch.Much cheaper than the direct replacement one too.

Installed onto a 05 duramax. Works great. I had to install an OReillys brake switch because it wouldn’t come out of park with the factory one after installing this part.

It was an upgrade for the truck and it was night and day difference. Perfect booster.

Broken return line

I was able to fit the ACDelco 178-1036 in my Class A Motorhome. It's an almost bolt in replacement. There are two differences:1. The push rod hole is about 1mm 1/16 too larger then the bolt on the P30 - I've just wrapped a few layers of metal flashing around the bolt to make it a flush sit. Basically building a sleeve for the bolt.2. The rod is slightly shorter. Which means that the brake pedal sits a tad lower - (adjusting the brake light switch - disconnect the cables and screw it inwards) -when you install the whole bracket assembly make sure to have it all the way down in the screw holes.Otherwise - on my 2003 Workhorse not even the push rod for the brake master cylinder needs to be changed out - has the same exact length.The first test drive around the block was a great success - the brakes feel much better, less pedal pressure - stuff was flying forward :PThis booster has about 1/4 inch more piston diameter. Such it has more support. What the P30/P32 platform definitely needs.Further there are no new parts available for those old RVs anymore. This new original part is a easy, almost bolt in replacement and upgrade.

this moder year is 100% better that the original 02 model and breaking is much better.internal parts must be better.