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07-02-2004, 08:51 PM
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#1 |
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Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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brake pedal problems
I dont drive my 72 everyday .Lately when I drive it the brake pedal returns to its normal position very slowly after being applied.They are power disc brakes.I noticed the other day that the tailbrake lights were on. I readjusted the switch at the pedal, but have to pull the pedal to get it to return to normal position. brakes work fine , no fluid loss or grabbing or pulling left or right.they just have been returning too slowly back to position. any answers?
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 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust |
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07-02-2004, 09:20 PM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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I would try lubing the linkage that is between the booster and the firewall. It sounds like it is sticking. Also, make sure the return spring is ok.
Jim |
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07-03-2004, 05:10 AM
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#3 |
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Senoir Member
Join Date: Mar 2002
Location: Rock Hill, SC USA
Posts: 1,214
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Sounds like the vacuum booster may be bad. See if you hear air hissing around the booster shaft under the hood when the brake is applied....that's another sign.
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67 Chevy, Small back glass, Factory 4WD, Factory Shortbed, Factory V8, Lifted 4" 70 GMC Sierra Grande, Factory Shortbed, Factory 402/400 turbo, Super Custom Interior. Numbers matching with SPID & Build Sheet. 68K Original Miles. Restored 2010 70 GMC Restoration Pictures http://67-72chevytrucks.com/gallery/...00&ppuser=4424 |
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07-03-2004, 03:23 PM
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#4 |
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Registered User
Join Date: Jul 2002
Location: Memphis, Tn
Posts: 194
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Sounds like the brake-to-master cylinder rod may be binding, possibly on the rubber boot that goes through the firewall. Good luck and keep on truckin'.....Jerry
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'68 c-10 long wheelbase fleetside, been in family since new, originally 250 3 speed Now (389) 350 .060 over 3.75 stroke,Edelbrock Performer RPM 70cc heads and Intake 600 cfm Edelbrock,Small Comp Cams retro-roller cam and roller rockers,9:1 cr, headers, HEI,Old Air a/c, 72 power disc brakes w/stainless lines, 3.42 gear,T-56 6-speed, original paint(what's left of it). Dakota Digital Dash |
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07-04-2004, 04:59 PM
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#5 | |
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Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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Quote:
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1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust |
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07-04-2004, 06:40 PM
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#6 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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It's part of the brake pedal assembly. If I remember when I get home I will take a picture and post it for you.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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07-04-2004, 07:01 PM
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#7 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Krue,
I went ahead and took a picture of the spring in the assembly that I have out. I was not sure if you had to take a picture with the assembly in the truck, (could be difficult). The return spring on a 72 is just above the brake light switch as pictured. Jim |
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07-04-2004, 10:33 PM
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#8 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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THAT'S NOT WHAT IT LOOKS LIKE, there isn't near enough rust!
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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07-04-2004, 10:36 PM
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#9 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Now he has two different views anyways!
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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07-05-2004, 05:57 AM
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#10 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Krue,
Good pic! I see that you do have an assembly out in the open. With the column under the spring it might be tough to get a pic with the brake assemble installed. Jim |
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07-05-2004, 08:25 AM
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#11 |
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Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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Hey do you think a missing spring will cause this? Wow I looked under the cab as soon as I seen the Pics and didnt see any spring at all. Thanks for the help, I am going to get a spring and install it. Wonder where I can get the spec. part?
__________________
1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust |
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07-05-2004, 11:55 AM
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#12 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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PM me your address and I will mail you the one in the picture if you want.
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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07-06-2004, 04:04 PM
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#13 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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It's on it's way.
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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