power break swap help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dougs69c10 · 09-17-2006, 07:45 PM

So today i mounted up my new booster/mastercylinder bled the brakes all the good jazz and the pedal has a soft feel to it. But after the pedal travels half way down it gets nice and firm.

We re bled the brakes 2 times, fluid squirted out nicely rebench bled the m/c and it still does it.

One thing I noticed is that when the truck is off the pedal has the feel id like, but when you push on the pedal and turn the truck on it just sinks to the floor.

I know I prob need to adjust the pedal b/c when I attached it i had to push it in an inch or so, So i figured if i adjust the rod out the inch or so it might help, but IM stumped.

Thanks

krue · 09-17-2006, 08:39 PM

Check your adjustment between the booster and m/c, you need a little freeplay there (1/8" or so iirc).

dougs69c10 · 09-17-2006, 09:21 PM

Quote:

Originally Posted by krue

Check your adjustment between the booster and m/c, you need a little freeplay there (1/8" or so iirc).

m/c and booster we bought as one piece from work, never seperated

dougs69c10 · 09-17-2006, 11:37 PM

does the place of vacuum matter? right now its running off a nipple that is coming out of the intake manifold, next to the carb

09-17-2006, 07:45 PM	#1
dougs69c10 Registered User Join Date: Feb 2006 Location: Birmingham,Alabama Posts: 260	power break swap help So today i mounted up my new booster/mastercylinder bled the brakes all the good jazz and the pedal has a soft feel to it. But after the pedal travels half way down it gets nice and firm. We re bled the brakes 2 times, fluid squirted out nicely rebench bled the m/c and it still does it. One thing I noticed is that when the truck is off the pedal has the feel id like, but when you push on the pedal and turn the truck on it just sinks to the floor. I know I prob need to adjust the pedal b/c when I attached it i had to push it in an inch or so, So i figured if i adjust the rod out the inch or so it might help, but IM stumped. Thanks __________________ 1969 c10 stepside 250 inline six, 4speed granny tranny, 4.11 posi rear end

09-17-2006, 08:39 PM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: power break swap help Check your adjustment between the booster and m/c, you need a little freeplay there (1/8" or so iirc). __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

09-17-2006, 11:37 PM	#4
dougs69c10 Registered User Join Date: Feb 2006 Location: Birmingham,Alabama Posts: 260	Re: power break swap help does the place of vacuum matter? right now its running off a nipple that is coming out of the intake manifold, next to the carb __________________ 1969 c10 stepside 250 inline six, 4speed granny tranny, 4.11 posi rear end

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