[Bama57]

I saw this thread while searching for hydroboost pushrod length.............


Just a warning !!

I ordered a new GM reman hydroboost from Rock Auto and had to use my old pushrod
( 3.45 in length ) It stuck out oh-so-little ( almost flush with the front flange of the new hydroboost ) It locked the front rotors.

Put the pushrod back in the bad hydroboost ( it ws leaking steering fluid )
and the pushrod is inside the front flange by the depth of the notch that is under the bore of the hydroboost.

Looking at my master cylinder, it inserts about a half inch inside the hydroboost before the flanges mate. It looks like there must have been some pre-load on the master cylinder all the time ( ?? ) Gotta get my digital calipers to measure, but should there be ANY preload ? If so, I have a bunch of grinding or making a spacer to correct this .

Any Suggestions ?


Thanks. Don in Huntsville

btw ...... Hello everybody !!