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10-14-2024, 09:30 AM
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#1 |
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Registered User
Join Date: Mar 2007
Location: south carolina
Posts: 251
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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
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10-14-2024, 10:30 PM
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#2 |
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Senior Member
   
Join Date: Jan 2018
Location: Hickory Flat, GA
Posts: 4,483
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Re: Soft Brake Pedal
Did you drill a new hole for the power brake pedal ratio?
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Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here1963-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 |
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10-15-2024, 03:40 PM
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#3 |
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Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,619
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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; 10-15-2024 at 03:47 PM. |
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10-15-2024, 03:43 PM
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#4 | |
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Registered User
Join Date: Jan 2009
Location: Burbank, CA
Posts: 3,619
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Re: Soft Brake Pedal
Quote:
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10-15-2024, 10:26 PM
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#5 | |
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Senior Member
Join Date: Jan 2018
Location: Hickory Flat, GA
Posts: 4,483
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Re: Soft Brake Pedal
Quote:
__________________
Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here1963-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 |
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10-15-2024, 10:32 PM
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#6 |
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Registered User
Join Date: Feb 2013
Location: central California
Posts: 2,759
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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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10-16-2024, 08:46 AM
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#7 |
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Registered User
Join Date: Mar 2007
Location: south carolina
Posts: 251
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Re: Soft Brake Pedal
Thanks for the input, I’m chasing my tail on this one ! I did the math equation on pedal ratio and it came out to what it’s supposed to be for power assist brakes. I’m going to recheck it again and make sure I did it correctly
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10-16-2024, 05:30 PM
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#8 |
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Registered User
Join Date: Mar 2007
Location: south carolina
Posts: 251
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Re: Soft Brake Pedal
THANKS EVERYONE!!! Y’all steered me right to the problem . I had the ratios for the brake pedal backwards .I was thinking 6:1 for power assist and 4:1 for manual ???? Drilled a hole in the correct location and now I have a BRAKES and a firm pedal !!
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10-21-2024, 02:27 PM
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#9 |
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Senior Member
Join Date: Oct 2007
Location: Marietta, GA
Posts: 803
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Re: Soft Brake Pedal
Glad you got it fixed - drilling the lower hole is a must.
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10-21-2024, 04:06 PM
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#10 | |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,712
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Re: Soft Brake Pedal
Quote:
If you have a bellcrank between your firewall and booster you use the existing hole. https://www.speedwaymotors.com/Power...iABEgJdvvD_BwE |
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