More brake help please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**BOSS** · 12-05-2005, 05:43 PM

Hey guys,i have had some trouble with my brakes and i though i could fix it but i guess i was wrong.lol.first i will let you know what it has been doing.When i push on the pedal sometimes it is like i have no assist most of the time,even when i pump the brakes i just get power brakes some of the time,now for what i have done,i have a new booster that does work because when i pull the vac hose off of it i can hear it release the air inside,also i have put new pads on the front.any other ideas i can try to get them to work like they should?what else would you suggest?Thanx for any help i can get!!

**truckdude239** · 12-05-2005, 05:47 PM

i'd check the check vavle on the booster sounds like its sticking

**BOSS** · 12-05-2005, 05:51 PM

where is that located at exactly...lol.

67ChevyRedneck · 12-05-2005, 06:21 PM

Has your truck always had power brakes, or did you add them yourself.... is it possible you hooked up the the wrong vacuum port?

**BOSS** · 12-05-2005, 06:29 PM

as far as i know it has allways had them,it didnt have an engine when i bought it but i got the vac hooked up to the back of the carb.

67ChevyRedneck · 12-05-2005, 06:33 PM

You could have a bad carb or bad booster? I'm guessing when you pull the hose with the engine running you can hear it constantly sucking air? Your saying your brakes work, but you have no power assist, right? maybe your new booster is bad?

dwaite72lnghrn · 12-05-2005, 07:26 PM

A question? Did you pull the check valve out of the booster or just the hose? On mine when I pull the check valve it slaps real hard like a spring snapping. If I pull the hose no sound.

**BOSS** · 12-05-2005, 07:38 PM

i pulled the valve out and it poped,is there somewhere else i can try to attach the vac line to besides the carb?I have another carb i can try if i need to,thanx for all of the help so far.

**truckdude239** · 12-05-2005, 07:41 PM

the vac line for the power brakes should not be hooked to the carb but to the intake manifold you get more vac from the intake and makes the brakes work better

**BOSS** · 12-05-2005, 07:45 PM

that may make a difference,i will have to see where i can put it at,it is the rpm performer edlebrock,any ideas?

dwaite72lnghrn · 12-05-2005, 08:03 PM

Every vacuum booster I ever saw was in the back of the carb it is the same as the manifold. Do you have a vacuum gauge you could put on it to see if the hose is good. Most have a metal tube from the carb to just above the valve covers then change to rubber to the check valve. It is a very stiff hose so it won't collapse with the vacuum.

**BOSS** · 12-06-2005, 07:05 AM

sorry i dont have a gauge,any other ways to check it?

dwaite72lnghrn · 12-06-2005, 07:26 AM

No accurate way. Pull the hose and put your finger over it start the truck and see if it pulls on your finger then after it is running take your finger off and see if the engine stumbles or dies. If the hose collapses it will stay running smooth. this should be done when the engine is warmed up.

12-05-2005, 05:43 PM	#1
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	More brake help please Hey guys,i have had some trouble with my brakes and i though i could fix it but i guess i was wrong.lol.first i will let you know what it has been doing.When i push on the pedal sometimes it is like i have no assist most of the time,even when i pump the brakes i just get power brakes some of the time,now for what i have done,i have a new booster that does work because when i pull the vac hose off of it i can hear it release the air inside,also i have put new pads on the front.any other ideas i can try to get them to work like they should?what else would you suggest?Thanx for any help i can get!! __________________ Support our site Norwood Survivor

12-05-2005, 05:47 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: More brake help please i'd check the check vavle on the booster sounds like its sticking __________________ 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 Last edited by truckdude239; 12-05-2005 at 05:48 PM.

12-05-2005, 05:51 PM	#3
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	Re: More brake help please where is that located at exactly...lol. __________________ Support our site Norwood Survivor

12-05-2005, 06:21 PM	#4
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: More brake help please Has your truck always had power brakes, or did you add them yourself.... is it possible you hooked up the the wrong vacuum port? __________________ 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!

12-05-2005, 06:29 PM	#5
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	Re: More brake help please as far as i know it has allways had them,it didnt have an engine when i bought it but i got the vac hooked up to the back of the carb. __________________ Support our site Norwood Survivor

12-05-2005, 06:33 PM	#6
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: More brake help please You could have a bad carb or bad booster? I'm guessing when you pull the hose with the engine running you can hear it constantly sucking air? Your saying your brakes work, but you have no power assist, right? maybe your new booster is bad? __________________ 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!

12-05-2005, 07:26 PM	#7
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: More brake help please A question? Did you pull the check valve out of the booster or just the hose? On mine when I pull the check valve it slaps real hard like a spring snapping. If I pull the hose no sound. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

12-05-2005, 07:38 PM	#8
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	Re: More brake help please i pulled the valve out and it poped,is there somewhere else i can try to attach the vac line to besides the carb?I have another carb i can try if i need to,thanx for all of the help so far. __________________ Support our site Norwood Survivor

12-05-2005, 07:41 PM	#9
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: More brake help please the vac line for the power brakes should not be hooked to the carb but to the intake manifold you get more vac from the intake and makes the brakes work better __________________ 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

12-05-2005, 07:45 PM	#10
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	Re: More brake help please that may make a difference,i will have to see where i can put it at,it is the rpm performer edlebrock,any ideas? __________________ Support our site Norwood Survivor

12-05-2005, 08:03 PM	#11
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: More brake help please Every vacuum booster I ever saw was in the back of the carb it is the same as the manifold. Do you have a vacuum gauge you could put on it to see if the hose is good. Most have a metal tube from the carb to just above the valve covers then change to rubber to the check valve. It is a very stiff hose so it won't collapse with the vacuum. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

12-06-2005, 07:05 AM	#12
BOSS Just here to help Join Date: Jan 2002 Location: Norwood,Mo Posts: 3,890	Re: More brake help please sorry i dont have a gauge,any other ways to check it? __________________ Support our site Norwood Survivor

12-06-2005, 07:26 AM	#13
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: More brake help please No accurate way. Pull the hose and put your finger over it start the truck and see if it pulls on your finger then after it is running take your finger off and see if the engine stumbles or dies. If the hose collapses it will stay running smooth. this should be done when the engine is warmed up. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne



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