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11-07-2011, 08:31 PM
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#1 |
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Registered User
 Join Date: Apr 2011
Location: Holbrook, NY
Posts: 60
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power brake conversion question
Converted my 67 k10 to power disc brakes with 80's 1/2 ton axles. I got a 72 power booster and master cylinder, with the 80's prop valve. The brakes work well, but if I stall or lose vacuum I have absolutely no stopping power whatsoever. I mean NOTHING. I'm fine driving it, but real nervous that if the truck stalls I'm screwed. Anybody know if something in this combination is no good?
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67 K10 stepside (driving project) 06 Tahoe (family truckster) 84 vette (fast toy) 00 Harley Fatboy (2 wheel toy) 67 Mustang (project) |
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11-07-2011, 11:04 PM
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#2 |
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Registered User
Join Date: Aug 2011
Location: Dallas, TX
Posts: 95
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Re: power brake conversion question
Someone can chime in if I'm talking out my you-know-what, but you can put a check valve in the vac line going to the booster. Basically holds vacuum so you can brake once after the engine stalls. After that, you're hosed.
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65 SWB BBW - 283, TH400 |
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11-07-2011, 11:14 PM
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#3 |
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C/10 junkie
Join Date: Nov 2010
Location: Stockton Ca
Posts: 9,093
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Re: power brake conversion question
Even if you lose the booster you should still have manual brakes. Prob will have to just about stand on the brakes but should be able to stop. If not then something else may be wrong.
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" 
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11-07-2011, 11:29 PM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: power brake conversion question
power brakes with no vacuum takes a LOT of effort to apply. These trucks seem to be worse than other vehicles. (it is much harder than a manual brake setup)
You need to test your booster. When the engine is first shut off, you should have enough vacuum left to apply the brakes with relative ease) 2 or 3 times. If the pedal goes 'hard' before that, then you most likely have a bad booster. I personally lost an engine to a booster that worked like this, shatterred a piston from a major lean condition in one cylinder. |
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