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#1 |
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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#2 |
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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#3 | |
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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#4 |
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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#5 |
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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#6 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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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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#7 |
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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#8 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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THAT'S NOT WHAT IT LOOKS LIKE, there isn't near enough rust!
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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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#9 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Now he has two different views anyways!
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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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#10 |
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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#11 |
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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#12 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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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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#13 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
|
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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