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02-03-2010, 10:49 PM
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#1 |
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Registered User
Join Date: Sep 2007
Location: Vilseck Germany (currently)
Posts: 317
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brake question
OK, I've replaced everything(power drums all around). shoes, cylinders, and even the booster. The only thing I didn't replace yet is the master cylinder. My problem is that even with all the air bled out the brake pedal sinks to the floor while I sit at a traffic light. Would a bad MC cause this? The system doesn't leak anywhere. The truck stop well, but as I sit at an idle the pedal sinks to the floor. Can anyone enlighten me? thanks, Cnut
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02-03-2010, 11:00 PM
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#2 |
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Registered User
Join Date: Oct 2008
Location: Taylor, TX
Posts: 95
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Re: brake question
100%. Don't rebuild it. Just get a new one. The fluid is bleeding past the piston. I bet you $100 it fixes it. Anybody wanna take me on this????
__________________
1970 Short/Fleet C-10 (Project) -Slammed and Tubbed 1955 Cameo -Straight six, Turbo Hydro option 1955 BelAir 2 door post -All original down to the oil bath air cleaner 1964 Corvette -All power A/C 327 4 spd. tanker 
Last edited by BOOB; 02-03-2010 at 11:01 PM. |
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02-03-2010, 11:02 PM
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#3 |
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Registered User
Join Date: Jun 2009
Location: Newnan, GA
Posts: 485
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Re: brake question
vaccum leak or bad seals in the mc? can someone listen under the hood in the drive way while you press the brake?
__________________
 Learning as I go! ------------------------------------- |
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02-03-2010, 11:05 PM
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#4 |
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Registered User
Join Date: Oct 2008
Location: Taylor, TX
Posts: 95
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Re: brake question
The only way a MC will bleed down is a hydraulic failure.
__________________
1970 Short/Fleet C-10 (Project) -Slammed and Tubbed 1955 Cameo -Straight six, Turbo Hydro option 1955 BelAir 2 door post -All original down to the oil bath air cleaner 1964 Corvette -All power A/C 327 4 spd. tanker
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02-03-2010, 11:06 PM
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#5 |
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Registered User
Join Date: Oct 2008
Location: Taylor, TX
Posts: 95
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Re: brake question
A vacuum leak would cause the brake pedal to be hard.
__________________
1970 Short/Fleet C-10 (Project) -Slammed and Tubbed 1955 Cameo -Straight six, Turbo Hydro option 1955 BelAir 2 door post -All original down to the oil bath air cleaner 1964 Corvette -All power A/C 327 4 spd. tanker
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02-04-2010, 12:24 AM
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#6 | |
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Registered User
Join Date: Jan 2003
Location: arizona
Posts: 213
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Re: brake question
Quote:
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02-04-2010, 12:30 AM
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#7 | |
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Registered User
Join Date: Oct 2008
Location: Taylor, TX
Posts: 95
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Re: brake question
Quote:
__________________
1970 Short/Fleet C-10 (Project) -Slammed and Tubbed 1955 Cameo -Straight six, Turbo Hydro option 1955 BelAir 2 door post -All original down to the oil bath air cleaner 1964 Corvette -All power A/C 327 4 spd. tanker
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02-04-2010, 02:48 AM
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#8 |
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Registered User
Join Date: Jun 2009
Location: Dub VC Utah
Posts: 364
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Re: brake question
I had the same problem. It's your master cylinder. The master cylinder on these trucks are cheap.
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02-04-2010, 03:09 AM
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#9 | |
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Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: brake question
Quote:
 My bet is that you are right on, but it could also be a small leak in the system anywhere else it has been apart crazyL
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http://community.webshots.com/user/hotrodhorn |
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02-04-2010, 08:02 AM
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#10 | |
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Registered User
Join Date: Oct 2008
Location: Taylor, TX
Posts: 95
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Re: brake question
Quote:
__________________
1970 Short/Fleet C-10 (Project) -Slammed and Tubbed 1955 Cameo -Straight six, Turbo Hydro option 1955 BelAir 2 door post -All original down to the oil bath air cleaner 1964 Corvette -All power A/C 327 4 spd. tanker
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02-04-2010, 08:11 AM
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#11 |
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Hittin E-Z Street on Mud Tires
 
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: brake question
If your pedal goes to the floor, then something is leaking. When the MC goes bad, you can sometimes see fluid up under the dash, dripping off of the rod that goes into the MC from the brake pedal. They're not that expensive, if you're sure everything else is good, it's probably the MC.
__________________
Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride  American Born, Country by the Grace of God  1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 02-04-2010 at 08:14 AM. |
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02-04-2010, 11:40 PM
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#12 |
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Registered User
Join Date: Sep 2007
Location: Vilseck Germany (currently)
Posts: 317
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Re: brake question
Thanks to all. It was the MC for sure. $15.00. Now all I have to do now is readjust my rod to the original length (I turned it out to compensate for the bad MC, live and learn). Also put a new Edelbrock Carb on too (Oh, Happy days!!! Did I ever say my wife really loves me?), now the ol' girl runs like a scalded hog! Cnut
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02-05-2010, 10:35 PM
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#13 |
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Registered User
Join Date: Jan 2010
Location: Ontario
Posts: 400
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Re: brake question
I think it's unanimuous ,, get a new mc. I just replaced mine. Remember to bleed it before you mount it on the truck.
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02-06-2010, 10:08 AM
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#14 |
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Registered User
Join Date: Jun 2009
Location: Berkley, Massachusetts
Posts: 235
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Re: brake question
I agree with glider 6969, Just replaced my mc, had the same problem. bench bleeding the mc is a must.
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