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8/9/06 1:24am - Original Message: 'Having more trble with my brakes'
L82vette77 Lifetime Member
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Westerly, RI - USA

Vette(s):
77 L48 Original paint True dual stainless exhaust Edelbrock intake manifold and Thunder series carb Distributor has an pern upgrade

Joined: 5/26/2005
Posts: 133

My brakes just got real mushy.  When you step on the brake peddle there is a whooshing sound.  The retired mechanic at the end of the street checked it and said it was the power brake booster that had a vaccuum leak in it.  No air came out of the lines when I tried to bleed the brakes again.  (Sarge and Jim did an excellant job on the lines in PF) 

I see a power booster in the Mid America catalog.  What is the difference between the repo ($199.00) and the GM ($329.00).  Also where could I get a cromed unit?  I'm trying to upgrade with every repair.  I don't want to do it twice.

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8/9/06 8:04am - Reply: 'Having more trble with my brakes'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
The "whoosing" sound could very well be the booster, or the check valve on the vac. line to the booster. In most cases, tho, a leaking booster will make the pedal harder, not mooshy.

If you bled the lines, and no air came out, I would think the problem would be in the master cyl. As we all know, "new" don't mean squat!

You might also have a rubber line that is expanding under pressure, and causing the soft pedal feel.

Don't know about a chrome booster, but I'm sure someone, somewhere offers them! The diff. between GM and repro? Looks like about $130!!

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Joel Adams
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8/9/06 10:06am - Reply: 'Having more trble with my brakes'
L82vette77 Lifetime Member
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Westerly, RI - USA

Vette(s):
77 L48 Original paint True dual stainless exhaust Edelbrock intake manifold and Thunder series carb Distributor has an pern upgrade

Joined: 5/26/2005
Posts: 133

I don't know if this makes any difference but the mechanic pulled the vaccuum line off the booster and put his thumb over it.  Plugged in or without thumb sealing the vaccuum the idle was rougher--he pointed out that you could see the air cleaner shaking more.  With his thumb on the vaccuum line the idle--the shaking--smoothed out. 

So no real difference in performance between the repo and the GM?



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8/9/06 5:41pm - Reply: 'Having more trble with my brakes'
Ron 78 Lifetime Member
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BINGHAMTON, NY - USA

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Joined: 7/19/2003
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No difference in looks or operation,just The General charges more for factory parts,New77guy, Louis,bought a chrome booster and Master cylinder for his 77,look him up and ask him how much he paid for his

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8/9/06 5:56pm - Reply: 'Having more trble with my brakes'
VETTENUT Lifetime Member
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1974 Stingray and 2004 Six-speed Convertible

Joined: 1/27/2003
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I will ask the obvious, when you rebuilt your brakes, did you bleed the Master Cylinder once you had everything back in place? If not, the brakes could feel mushy, but you might not get bubbles out of the lines at the calipers. The bubbles get trapped in the Master Cylinder and can cause the brakes to feel mushy.
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8/9/06 8:25pm - Reply: 'Having more trble with my brakes'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
It shore sounds like the booster has a ruptured diaphram. I still don't think that would cause the mooshy pedal. Maybe Jim or Sarge put a time released "air" capsule in there while installing it in the parking lot!!(ya just cain't git good help no mo!! )
I would replace the master while doing the booster, or at least have one on hand, just in case. Adams' Apple38938.7659722222

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Joel Adams
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8/9/06 9:05pm - Reply: 'Having more trble with my brakes'
JimG Lifetime Member
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Gloucester, VA - USA

Vette(s):
1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition

Joined: 1/29/2005
Posts: 1453
I knew this would end up being my fault somehow....

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The Money Pit.... and my niece

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8/9/06 9:14pm - Reply: 'Having more trble with my brakes'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449


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Joel Adams
C3VR Lifetime Member #56    
My Link


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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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8/9/06 9:17pm - Reply: 'Having more trble with my brakes'
Ron 78 Lifetime Member
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BINGHAMTON, NY - USA

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Joined: 7/19/2003
Posts: 3805
Nothin but ,LOVE, Jim

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8/10/06 12:03pm - Reply: 'Having more trble with my brakes'
2 cruzn Lifetime Member
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Poquoson, VA - USA

Vette(s):
73 Conv, Blue-Green/White Top - 454, M21 - Dark Saddle Leather, Power Windows, A/C, Tilt/Tele, AM/FM St. (orig. and sounds like it too).#2 -- 2007 Coupe,3 LT package, Z51 option, Victory Red, Ebony Int. Clear Top.

Joined: 11/20/2004
Posts: 1023

[QUOTE=JimG]I knew this would end up being my fault somehow.... [/QUOTE]

I think as long as you pay him back.. all will be forgiven...



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Blue Green *** 454,4 Spd, Dark Saddle Leather, A/C, AM-FM St. (orig), PW, Tilt -Tele Wheel"



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8/10/06 12:19pm - Reply: 'Having more trble with my brakes'
L82vette77 Lifetime Member
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Westerly, RI - USA

Vette(s):
77 L48 Original paint True dual stainless exhaust Edelbrock intake manifold and Thunder series carb Distributor has an pern upgrade

Joined: 5/26/2005
Posts: 133

Listen guys Jim, Sarge, Dave got me running again and able to run the Dragon.  It's just that it's a 77.  Gotta keep pampering them to make them feel loved.

I ordered the booster from Mid-America.  When it comes in and I fix it I'll let you know the results.



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8/11/06 12:24am - Reply: 'Having more trble with my brakes'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Oh, come now, Richard...jest pokin a little fun.
The best techs in da world cain't be blamed for bad parts.
Let us know how the booster does.(and how much fun you had taking it off!)

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Joel Adams
C3VR Lifetime Member #56    
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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8/11/06 12:34am - Reply: 'Having more trble with my brakes'
Pumps
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Virginia City, NV - USA

Vette(s):
1979 Coupe, white in color

Joined: 1/19/2005
Posts: 314

Man, I hope I never have to change a booster on a vette again. I still don't know how anybody does it layin on thier back? I have just about ever socket, extension, wobble extension, universal sockets and universal joints that Snap On, Mac and Matco make and it still was a pain in the butt. I can't wrap my self around the mushy thing tho, but it sounds like a bad booster.

Dave

Pumps38939.8996527778

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8/11/06 9:35am - Reply: 'Having more trble with my brakes'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3194
[QUOTE=Pumps]

Man, I hope I never have to change a booster on a vette again. I still don't know how anybody does it layin on thier back? I have just about ever socket, extension, wobble extension, universal sockets and universal joints that Snap On, Mac and Matco make and it still was a pain in the butt. I can't wrap my self around the mushy thing tho, but it sounds like a bad booster.

Dave

[/QUOTE]

yep that booster change is fun fun fun

everytime I have done it I somehow lose that 4th nut that is really hard to put on 



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8/11/06 10:57pm - Reply: 'Having more trble with my brakes'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
So...Ben....how many 'Vettes are out there now with only 3 nuts holding the booster on?

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Joel Adams
C3VR Lifetime Member #56    
My Link


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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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8/12/06 1:27pm - Reply: 'Having more trble with my brakes'
Pumps
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Virginia City, NV - USA

Vette(s):
1979 Coupe, white in color

Joined: 1/19/2005
Posts: 314

Hey Ben, Jest let Joel know ya don't need brakes, only the gears.

 

Dave



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8/12/06 10:10pm - Reply: 'Having more trble with my brakes'
cthulhu Lifetime Member
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Hot Springs, AR - USA

Vette(s):
69 Conv #'s Match 427, TKO-600, 3.36HD-Posi, T/T, PS, PB, PW, SP, Lthr, Comp Mag 270 & Pro Rlr Rockers, Edel Air-Gap RPM, BG SD 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Hly Bl Fuel Pump, K&N, Jet-Hot Hkr Side-Pipes,Steeroids, Al Rad, Spal Fans

Joined: 4/24/2004
Posts: 3194
[QUOTE=Pumps]

Hey Ben, Jest let Joel know ya don't need brakes, only the gears.

Dave

[/QUOTE]

When i was in the marines I knew a guy who had a small truck of the s10/ranger variety and he had no brakes, only the gears and the ignition key

he said "brakes, who needs brakes when youve got a clutch"

he was nuts !!

 



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8/13/06 5:15pm - Reply: 'Having more trble with my brakes'
tuxblacray Lifetime Member
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Greensburg, IN - USA

Vette(s):
Previous: 1984 Silver / Charcoal Coupe, 1988 Maroon Coupe / 1989 Artic White / Mod. Red Int. Coupe, Present:1976 Stingray Black / Black, Auto, 350 slightly modified (355 hp) Luxor Wires Redline Tires. / 2001 Speedway White Vert, Torch Red Int, LS1, Auto.

Joined: 9/24/2003
Posts: 5174
Y'all, I thank it were Jim's wet shoes.... he could'nt tell if'n hit were a mooshy pedal or if'n hit were them shoes when he were a pressin down...
All bets aside I'm a bettin on the diaphram. No matter how ya look at it when them thangs rupture she's trouble. At that point hit don't much matter how many nuts ya got hangin. (a little PF humour type talk)

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10/15/12 7:53pm - Reply: 'Re: Having more trble with my brakes'
elcam33
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staten island, NY - USA

Vette(s):
1969 corvette coupe 350/350 4 spd a/c leather rear defrost all numbers match this car is loaded will all the goodys

Joined: 8/14/2012
Posts: 2
i had the same problem with my car and it was the booster 
put the new one on the car my brakes are the best i ever had now 
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