Soft Brake Pedal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Knothead · 10-14-2024, 09:30 AM

Current project is using a 1979 K10 frame and suspension. Utilizing brake system from same, everything is new except hard lines. Drums , Rotors, proportioning valve , brake booster , Master Cylinder also were replaced. I can get a firm pedal but after cranking engine pedal fades to the floor? The brakes will hold the truck when in gear. Also will stop truck . Can’t get a good pedal with it running? Ordered another MC just to eliminate that as maybe the problem. I’m scratching my head on this one , looking for some suggestions and input. If it matters it is an 6.0 LS engine,thanks

**cwcarpenter98** · 10-14-2024, 10:30 PM

Did you drill a new hole for the power brake pedal ratio?

forestb · Yesterday, 03:40 PM

Are you getting enough vacuum? I had a lot of problems with brakes due to having too large of a cam which decreases vacuum.

forestb · Yesterday, 03:43 PM

Quote:

Originally Posted by cwcarpenter98

Did you drill a new hole for the power brake pedal ratio?

I thought that drilling the new hole was so that after converting to power breaks the brakes are too sensitive and by moving the hole you are making it less sensitive.

**cwcarpenter98** · Yesterday, 10:26 PM

Quote:

Originally Posted by forestb

I thought that drilling the new hole was so that after converting to power breaks the brakes are too sensitive and by moving the hole you are making it less sensitive.

Someone who has done that conversion will have to chime in on that question. I kept my truck non-power, even with the front disc swap. My initial question was partly to help the conversation begin since that's a common question anyways

AcampoDave · Yesterday, 10:32 PM

^^^ I did that too. They work just fine unboosted. Sure, you have to push harder but no more so than the factory brakes required.

10-14-2024, 09:30 AM	#1
Knothead Registered User Join Date: Mar 2007 Location: south carolina Posts: 249	Soft Brake Pedal Current project is using a 1979 K10 frame and suspension. Utilizing brake system from same, everything is new except hard lines. Drums , Rotors, proportioning valve , brake booster , Master Cylinder also were replaced. I can get a firm pedal but after cranking engine pedal fades to the floor? The brakes will hold the truck when in gear. Also will stop truck . Can’t get a good pedal with it running? Ordered another MC just to eliminate that as maybe the problem. I’m scratching my head on this one , looking for some suggestions and input. If it matters it is an 6.0 LS engine,thanks

10-14-2024, 10:30 PM	#2
cwcarpenter98 Senior Member Join Date: Jan 2018 Location: Hickory Flat, GA Posts: 4,480	Re: Soft Brake Pedal Did you drill a new hole for the power brake pedal ratio? __________________ Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here 1963-ish truck bed trailer - Half-Wit 1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed 1995 Dodge Dakota Sport "I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson

Yesterday, 03:40 PM	#3
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,619	Re: Soft Brake Pedal Are you getting enough vacuum? I had a lot of problems with brakes due to having too large of a cam which decreases vacuum. Last edited by forestb; Yesterday at 03:47 PM.

Yesterday, 10:32 PM	#6
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,747	Re: Soft Brake Pedal ^^^ I did that too. They work just fine unboosted. Sure, you have to push harder but no more so than the factory brakes required.



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