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Hydroboost upgrade question

Avjody

New Member
Joined
Oct 26, 2021
Messages
6
So I'm wanting to to a hydroboost conversion on my 03 z71and I've sourced everything I need to do the conversion but the problem I'm finding is I have power adjustable pedals and I can't find any information if there was a hydroboost pedal assembly for adjustable pedals. I noticed while looking at my pedal assembly (still installed so it's hard as hail to see) that there is another hole in the pedal bracket. Is there a way that the pedal clevis pin can be moved to the upper hole for the hydroboost position? Any insight would be very appreciated

Jody
 
My 2004 EXT has Hydroboost with adjustable pedals.
 
About a year ago I replaced my hydroboost assembly for leaks and causing too high pressure in the system (taking out the seals in a new PS pump and old steering gear too), so I have been there. FUN, FUN, FUN!!! FYI the rod from booster goes over a pin permanently mounted in pedal arm, along with stop lamp switch (see attached document). Then a special clip holds all of it on the pin. Go ahead and buy a new stop lamp switch ahead of time as old one will likely fall apart when you take it off (mine did) - they are relatively cheap.

p.s. Booster rod points at same location on the pedal arm, irregardless of which booster is used. Why try to use a different location? I would think that if there was a potential difference, dependent on the booster - then GM would just use a different rod instead of re-engineering the entire pedal assembly.

Good luck
 

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  • 2003AvalancheStopLampSwitch.pdf
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Slickside, thank u for chiming in and ur advice is much appreciated. However with the utmost respect I can tell u that u r misinformed on the clevis point being in the same location on both booster type. I've been researching the conversion extensively for a while, I'm not sure y gm would make them different but I know that in all conversion (some being from this avalanche forum) they were specific in tell ur need a hydroboost pedal in a fixed pedal position application. But if anyone will give proof I'm wrong I would love to be proved wrong and save time and money on the work lol
 
If you already know - then why ask to be proven wrong?

hmm..... do different pedals mean there is a different vertical location for attachment? Or would it be because of something else. I would think same mounting in firewall would point rod to the same place.

Just doesn't make sense to me what you are proposing. But carry on..... proof is in the doing. I've been wrong before.
 
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The question I placed forward was not about whether or not there was a difference in attachment points the question was whether or not there was different pedal assembly for power adjustable pedals, they do have slightly different mount layouts but my searching says(not proven on my own yet) there is a dimple already on the vacuum boost firewall to drill the new hole for the hydroboost... what I have determined to calling around and asking is that there is 1 power adjustable pedal assembly that has to holes in the bracket for the clevis pin, the upper hole is for hydroboost and the lower is for vacuum, I don't know if hydroboost needs more leverage to operate? But regardless if anyone else is interested, this is the conclusion I've come up with. But when I physically do the conversion I will share my results.
 
Im sorry, but your asking "Is there a way that the pedal clevis pin can be moved to the upper hole for the hydroboost position?" certainly sounds like you were talking about attachment points. My mistake!
 
Read this slowly..... on power adjustable pedals..... IS THE CLEVIS PIN MOVABLE? I DONT NEED THE ANSWER WHETHER OR NOT MY STOCK POINT WILL WORK WITH HYDROBOOST.... ITS NOT THAT DIFFICULT
 
So the hydroboost conversion is pretty much done, damn this thing stops good! I had to make a new bolt in clevis rod because the new booster does in fact have a higher mounting point, had to notch the top of the hole in firewall.... the only thing I don't know what to do with now is what to do about the vacuum pump and sensor? It is causing my service brake system light to come on
 
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