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#1 |
Registered User
Join Date: Dec 2004
Location: beulah,alabama
Posts: 1,075
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Bad Brake Booster?
when i crank my truck my pedal gets sucked to the floor and wont come back up ,itlocs the brakes down,if i take vacum line off it doesnt do this .i have had bad boosters before but never had this problem ...any input?
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#2 |
Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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Re: Bad Brake Booster?
...sounds kind-of weird to me. but it unplugging the booster from the vacuum makes it better, then thats what i would say the problem is.
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. |
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#3 |
Registered User
Join Date: Dec 2004
Location: beulah,alabama
Posts: 1,075
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Re: Bad Brake Booster?
yeah i have never seen one pull the pedal to the floor and lock the brakes down...
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#4 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Bad Brake Booster?
Usually a bad booster causes the brake pedal to be difficult to depress...not vice-versa. But if disconnecting the vacuum line solves it, then it must be the booster.
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#5 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Bad Brake Booster?
Could it possibly be the check valve?
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Beat it to fit, Paint it to match... ![]() Last edited by Sinister; 04-28-2008 at 02:23 AM. |
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#6 |
Registered User
Join Date: Dec 2004
Location: beulah,alabama
Posts: 1,075
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Re: Bad Brake Booster?
is the check valve internal?
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#7 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Bad Brake Booster?
Hmmm...maybe the check valve is shot, and allowing TOO much vacuum to be pulled on the booster?? This sounds very reasonable to me, and a heck of a lot cheaper to fix!
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#8 |
Phone's ringin Dude.
![]() Join Date: Mar 2007
Location: Colorado Springs
Posts: 1,426
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Re: Bad Brake Booster?
The ckeck valve is the plastic thingy that your vacuum line hooks onto on the booster.
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#9 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Bad Brake Booster?
The check valve is the plastic piece that the vacuum line connects to on the outside of the booster.
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#10 |
Registered User
Join Date: Dec 2004
Location: beulah,alabama
Posts: 1,075
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Re: Bad Brake Booster?
will try another check vale tomm then hope thats it ,it was working right one day ...get in it the next and was saying wth!
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#11 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Bad Brake Booster?
???? Did you just replace something.I ask because I am wondering if maybe the pedal is slightly depressed causing the booster/brakes to activate.The brake light switch or the rod out of adjustment? Just some other things to check.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#12 |
Registered User
Join Date: Dec 2004
Location: beulah,alabama
Posts: 1,075
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Re: Bad Brake Booster?
i put the booster set up on a couple of months ago..and have driven the truck only around the shop as i was installing new engine and new 700r trans as well as swapping rearends..but it worked great till today.
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#13 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Bad Brake Booster?
Are you going to be at Mike's tomorrow?
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#14 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Bad Brake Booster?
the check valve doesn't limit the vacume applied, it prevents the vacume from escaping.
It's a new one by me... but it about has to be the booster. |
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#15 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Bad Brake Booster?
yeah, i know it's purpose is to prevent it from escaping, but it's worth a shot as weird as this problem is!!
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#16 |
Senior Member
Join Date: Jan 2007
Location: central pa
Posts: 428
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Re: Bad Brake Booster?
I had a similar problem with a pedal sticking I had to take apart my bracket and lever from behind my booster. I blasted all the parts painted them and never seized them. I then used seal grease and lubed the plunger shaft that is under the boot facing the firewall. This took care of my sticking problem. Good luck
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#17 |
Registered User
Join Date: Dec 2004
Location: beulah,alabama
Posts: 1,075
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Re: Bad Brake Booster?
67-c30...i was goin to mikes but my kids had different plans for me ..lol
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#18 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Bad Brake Booster?
I know how that goes!
__________________
'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#19 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Bad Brake Booster?
bigblockorange, if you were to re-read the actual problem, you'll see that the pedal is not actually sticking, but getting sucked to the floor.
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