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07-18-2013, 11:41 PM
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#1 |
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Needs a Big Block
Join Date: Oct 2003
Location: Red Deer , Alberta
Posts: 1,198
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Help!!! Brakes apply themselves
I just converted a 68 3/4 ton. To a half ton
I used a 86 pickup front end. New everything Master cyl Booster Brake lines Calipers It's drives for a while then the brakes seem to stay On and then get worse The pedal gets very firm. And you can drive , the brakes are ON. It releases after sitting and cooling down. I'm running ideas through my head like Do I have the pedal rod out of adjustment, ? That would cause drag but would they come on and stay on? Do I have a bad prop valve ?? The booster and master are a kit from cpp This thing is driving me nuts Posted via Mobile Device
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1964 Short box On dropmembers and billets 1962 Suburban family cruiser 1972 K10 |
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07-18-2013, 11:45 PM
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#2 |
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Registered User
Join Date: Jul 2013
Location: Vallejo, California
Posts: 71
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Re: Help!!! Brakes apply themselves
This is a shot in the dark but where do you have the vacuum for the booster attached?
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07-19-2013, 12:00 AM
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#3 |
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Needs a Big Block
Join Date: Oct 2003
Location: Red Deer , Alberta
Posts: 1,198
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Re: Help!!! Brakes apply themselves
The vacuum is into the T in the intake behind the carb.
I just found it!!!!!! I used an assembled master / booster unit. I loosened the master from the booster and the brakes released.!!!!!!!!!!!! So ill adjust that rod in. And all should be well!!! Posted via Mobile Device
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1964 Short box On dropmembers and billets 1962 Suburban family cruiser 1972 K10 |
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07-19-2013, 12:09 AM
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#4 |
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Registered User
Join Date: Jul 2013
Location: Vallejo, California
Posts: 71
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Re: Help!!! Brakes apply themselves
Good deal. Glad you fixed your problem!
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07-19-2013, 12:16 AM
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#5 |
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Truckin' Krazy
 
Join Date: May 2000
Location: mesa az
Posts: 6,194
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Re: Help!!! Brakes apply themselves
There is a tool made for adjusting that rod to the proper depth, it makes it so you don't have to guess, I have some of them available.
Tom
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Dealer for: American Auto Wire Precision weatherstripping Dakota Digital Trim parts Carpets Truck World seat covers & Many others Chevy Parts locator in Mesa AZ! |
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07-19-2013, 06:53 AM
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#6 | |
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Senior Member
 
Join Date: May 2002
Location: Hammond, WI
Posts: 1,817
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Re: Help!!! Brakes apply themselves
Did you also replace the proportioning valve? Drum/drum valves are different from disc/drum valves.
Posted via Mobile Device
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Mike 2001 Dakota R/T - Silver CC - 1 of 1671 •360 w/46RE •392 limited slip 1972 Chevy Suburban - Turquoise/Black 1969 Chevy C/10 - Blue LWB •350 w/ 700R4 •3.73 posi •PS PB A/C - SOLD  Using your turn signal is not "giving information to the enemy" 67-72 FAQ Quote:
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07-19-2013, 02:57 PM
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#7 |
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Senior Member
 
Join Date: Nov 2012
Location: Shawnee, KS
Posts: 1,824
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Re: Help!!! Brakes apply themselves
I've had this happen in the past. What is happening is the bleed back hole in the master cylinder is plugged or it has pressure on it so it can not bleed back. You may have the rod between the master cylinder and booster to long and will cause this issue.
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Roger Koop |
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