Brake problems... Help please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72truckman · 02-27-2010, 06:41 PM

I did the one ton brake conversion on my blazer. now that im driving it, the pedal goes almost all the way to the floor before it starts braking. but when it does start braking, the rears almost instantly lock up and it seems like the fronts do nothing. think this is a problem with the proportioning valve?

FYI the pedal is firm and does not go to the floor and stops the truck well when the vacuum boost line is taken off, so i know the m/c is good.

Also, What are my options for proportioning valves?

02-27-2010, 06:41 PM	#1
72truckman Registered User Join Date: Mar 2006 Location: San Ramon, California Posts: 276	Brake problems... Help please I did the one ton brake conversion on my blazer. now that im driving it, the pedal goes almost all the way to the floor before it starts braking. but when it does start braking, the rears almost instantly lock up and it seems like the fronts do nothing. think this is a problem with the proportioning valve? FYI the pedal is firm and does not go to the floor and stops the truck well when the vacuum boost line is taken off, so i know the m/c is good. Also, What are my options for proportioning valves? __________________ My 1972 Blazer 5.3 E85/ NV4500 5spd 4x4 Work in Progress http://67-72chevytrucks.com/vboard/s...d.php?t=291482 **SOLD!!!!!** 1965 GMC 4X4 http://67-72chevytrucks.com/vboard/s...d.php?t=294727

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