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#1 |
Registered User
Join Date: Apr 2007
Location: Alabama
Posts: 35
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72 pickup brake pedal goes to floor
Ok,(72 disk/drum) try to make this short, bought truck knowing it had rear wheel cylinder leak, assuming this was also related to pedal, I have since replaced rear wheel cylinders and brake shoes. I have bled and bled these things (all 4 corners), but no change in pedal, with little resistance it just goes to the floor. I'm new to this site, but I would appreciate any advice. Things I have checked from reading other post. Brakes are adjusted so drums barely go on, combo/poportioning valve button(?) pushed in., and bled the @#it out of them.
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#2 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: 72 pickup brake pedal goes to floor
master cylider has gone bad
__________________
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 |
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#3 |
Will it run today?
Join Date: Feb 2007
Location: DFW, Texas
Posts: 272
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Re: 72 pickup brake pedal goes to floor
I recently had a similar problem. No leakage anywhere, but the brakes just kept getting worse. Finally pulled the MC and found that it was leaking back into the booster. Replaced the MC and all is well again.
Good luck!
__________________
Jaws, the 1971 Chevy Cheyenne Longbed. She's big, grey, and has an insatiable appetite! |
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#4 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: 72 pickup brake pedal goes to floor
if it is leaking into the booster always replace the booster
__________________
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 |
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#5 |
Registered User
Join Date: Apr 2007
Location: Alabama
Posts: 35
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Re: 72 pickup brake pedal goes to floor
Thanks guys, I put it on yesterday and their is a difference now I just need to re-bleed all four corners.
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#6 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: 72 pickup brake pedal goes to floor
just clamp the pin on the combination valve like it says in the service manual and the bleeding will go smoothly
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#7 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: 72 pickup brake pedal goes to floor
Make sure you bleed the new M/C as per the instructions that usually come with one. There's a cheap little kit you can buy for like $4 with hoses and clips that make it really easy too.
__________________
'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#8 |
chrome makes it go FASTER!
Join Date: Feb 2007
Location: Cleveland Tennessee
Posts: 2,884
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Re: 72 pickup brake pedal goes to floor
good luck and WELCOME to the board. Remember WE LIKE PICTURES !!
__________________
She can't cook and she won't clean. But she looks good in a skirt and she brings me beer. She can stay for now. EDIT:: But she left me anyway, So forget her. 1962 GMC Stepside V6 4 speed My rolling resto thread http://67-72chevytrucks.com/vboard/s...d.php?t=324226 My old farm truck http://67-72chevytrucks.com/vboard/s...=1#post3465005 |
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