Drum to Disk brake help needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steves1967 · 08-23-2010, 11:55 PM

I'm helping my buddy with his 70 GMC swb, he got a disk brake conversion kit from the Truck Shop, and a power booster from Kragen Auto Parts. He put the whole thing together and asked me to help bleed the brakes for him. Seems that the truck will stop, but he needs to pump the pedal a couple times to get a firm pedal. I bench bled the master cylinder, and I bleed each wheel 3 times around, no air bubbles in the system, yet he still has a soft pedal until he pumps it a couple times. Am I missing something here? Engien makes 17" of vacuum, the m/c isnt leaking. Attached is a pic of his setup, am I missing something?
Thanks!!

08-23-2010, 11:55 PM	#1
steves1967 Registered User Join Date: Dec 2001 Location: Manteca, Ca USA Posts: 305	Drum to Disk brake help needed I'm helping my buddy with his 70 GMC swb, he got a disk brake conversion kit from the Truck Shop, and a power booster from Kragen Auto Parts. He put the whole thing together and asked me to help bleed the brakes for him. Seems that the truck will stop, but he needs to pump the pedal a couple times to get a firm pedal. I bench bled the master cylinder, and I bleed each wheel 3 times around, no air bubbles in the system, yet he still has a soft pedal until he pumps it a couple times. Am I missing something here? Engien makes 17" of vacuum, the m/c isnt leaking. Attached is a pic of his setup, am I missing something? Thanks!! __________________ '71 Chevy 3/4 Ton Longbed '22 Chevy Tahoe RST '67 Firebird- 8 sec street car '24 GMC CC 4x4 Duramax Dually



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