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05-22-2006, 04:10 PM
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#1 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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brake problem
hi, i have 69 cten with all four wheel drum brakes new master cylinder, wheel cylinders pads...etc. i have all new parts except for the booster. the pedal goes almost to the floor. and i just cannot figgure out why. there is not one air bubble in the system... no leaky bleeder screws, wheel cylinders or kinked lines... im thinking it has to be the booster???? any help would be great. thanks...
david |
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05-22-2006, 04:41 PM
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#2 |
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'68 C-20 396 CST CC
 
Join Date: Mar 2005
Location: Spokane, WA
Posts: 454
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Re: brake problem
Can't see how a bad booster would contribute/allow the pedal to go to the floor...
Did you just add the booster to the system or was it there before all the brake work?
__________________
68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES  01 Jetta Turbo Daily Driver  84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico 
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05-22-2006, 05:01 PM
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#3 |
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Registered User
Join Date: Jan 2006
Location: Morro Bay C.A
Posts: 179
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Re: brake problem
booster was there....
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05-22-2006, 05:51 PM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: brake problem
Have you adjusted up the shoes?
Does pumping the pedal help? If so, does the pedal drop back down as you hold it for 60 seconds straight, or will it stay firm? |
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05-22-2006, 05:53 PM
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#5 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,233
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Re: brake problem
did you adjust the pedal for the new master cylider
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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05-22-2006, 06:15 PM
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#6 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: brake problem
Make sure the MS is the same as you took off (Delco-Bendix, etc.) The depth of the back maybe differant so that the push rod coming out of booster has further to travel. This rod can be adjusted.
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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05-22-2006, 07:24 PM
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#7 |
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Registered User
Join Date: Jun 2003
Location: Linden, North Carolina
Posts: 617
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Re: brake problem
Also the m/c bore size make a huge difference in pedal stroke
__________________
64 Panel Rebuild Pics Clutch Replacement and Borg Warner T10 Trans Rebuild 64 Panel 1/2 Ton 350cubes/400hp BorgWarner t-10 3:73 Auburn Posi |
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05-22-2006, 07:58 PM
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#8 |
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Truck junkie
 
Join Date: May 2006
Location: Reno NV
Posts: 697
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Re: brake problem
Did you bench bleed the master before you installed it. If there is air in the master cylinder you can bleed the brakes forever and the air in the master will just stay where it is. Just something to check out.
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05-22-2006, 09:14 PM
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#9 | |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: brake problem
Quote:
It's still agood idea to bench bleed, but I gravity blead a complete new brake system aver week or so, and when the master gets bolted up, it is bone dry. |
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