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#1 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Replaced power booster and MC. Pedal soft now
Well ol Samson got a new brake booster (stock) and master cylinder. Stock 4 drum brake system. Bench bled till no bubbles. Installed and hooked up lines. Bled from the farthest to the closest ran about 2 quarts through the system until clear fluid at each point.
Brake pedal still seems soft and sinks further to the floor than before. Way softer than before and goes almost to the floor before it stops. Also brakes don’t lock up like they use too. Old MC leaking out the back end seal and old booster leaking was the reason for replacement. Checked booster for leakage, nope. Checked vacuum, at 18hg, nope. Checked all bleeder points, no leakage, nope. Guess I’ll try to bleed the system again.........any ideas?
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#2 |
Moderator
![]() Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,193
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Re: Replaced power booster and MC. Pedal soft now
Is the bore diameter of the new master the same as the old?
Is the size of the power booster unit the same as old? Is the pivot point the same as the old? Are the brakes adjusted correctly? Can you pump up the pedal? Does the pedal drop when pumped up and then the engine is started? ![]() ![]() ![]()
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox ![]() ![]() ![]() |
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#3 |
Registered User
Join Date: Jun 2018
Location: Louisiana
Posts: 185
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Re: Replaced power booster and MC. Pedal soft now
Subscribed
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'72 Chevy Custom Deluxe Highlander. Med Olive/White 350/200 ps,pb and Air Conditioning! |
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#4 | |
Registered User
Join Date: Jan 2015
Location: Prairieville, LA
Posts: 129
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Re: Replaced power booster and MC. Pedal soft now
Quote:
Wade
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2016 Silverado2005 GMC Sierra 2002 Chevy Slverado Extra Cab (youngest sons) 2009 GMC Denali (oldest sons) 2015 Lexus 250i (wifes) 1972 Chevy C10 LWB, 5.3 / 4L60e swap "COLOR OF MONEY" http://www.louisianaclassictruckclub.com |
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#5 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Replaced power booster and MC. Pedal soft now
Yeah, I’m try that system out. Hopefully it’s just trapped air in the master. Had this issue quite a few years back one time. Took me two times bench bleeding it.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#6 | |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
|
Re: Replaced power booster and MC. Pedal soft now
Quote:
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#7 |
Senior Member
![]() Join Date: Jun 2009
Location: Portland - OR
Posts: 243
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Re: Replaced power booster and MC. Pedal soft now
Are the pushrod depths the same in both master cylinders? I know there is a deep and a shallow one. A deep one where there should be a shallow would make it so it doesn’t brake until the pedal is to the floor
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#8 | |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Replaced power booster and MC. Pedal soft now
Quote:
Thanks. Had not even thought of this as a potential issue.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#9 |
Senior Member
![]() Join Date: Jun 2009
Location: Portland - OR
Posts: 243
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Re: Replaced power booster and MC. Pedal soft now
I think one is for power brakes and one is for manual but when at the parts counter there is so specification on it. Seems like it’s luck of the draw
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#10 |
Registered User
Join Date: Apr 2011
Location: formerly NY currentlyNC
Posts: 390
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Re: Replaced power booster and MC. Pedal soft now
i believe the manual is a one inch bore and the power is larger...i just dont remember if its 1 1/16 or 1 1/8
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1970 short step c10 leaf spring 454 |
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