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05-26-2013, 09:13 AM
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#1 |
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Registered User
Join Date: Jan 2013
Location: Moyock, North Carolina
Posts: 9
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72 gmc k15 4x4...HELP lost brakes
 Hello all, I was driving home from Virginia beach last weekend and lost all brakes, had to pump them to get stopped, wife did not like that ride home at all! I do have power brakes with brand new pads on the front and decent drums on the rear. My dad and I bleed all the brakes and still nothing. If I pump the brakes a few times then I get some brakes, but I'm lost now. Anyone have any suggestion as to where to look next, how to check the master cylinder and/or the brake booster? Posted via Mobile Device |
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05-26-2013, 09:58 AM
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#2 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,204
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Re: 72 gmc k15 4x4...HELP lost brakes
It is most likely the master cyl. I would pull the rear drums first & make sure something hasn't come loose like a wheel cyl. rod not in the brake shoe. If the rear brakes are OK & adjusted up replace the master cyl. Remans are not expensive. Bench bleed it before you put it on. Pull the vacuum check valve out of the booster & make sure there is no brake fluid in it.
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05-26-2013, 11:26 AM
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#3 |
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Proprietor of Dale's Corner
 
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 15,955
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Re: 72 gmc k15 4x4...HELP lost brakes
most likely the master cyl if none of the wheels are wet
Posted via Mobile Device
__________________
"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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05-26-2013, 11:47 AM
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#4 |
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Registered User
Join Date: May 2012
Location: Anton, Texas
Posts: 2,364
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Re: 72 gmc k15 4x4...HELP lost brakes
i agree with everyone else, you have a bad master cly.
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05-26-2013, 02:23 PM
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#5 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: 72 gmc k15 4x4...HELP lost brakes
Is it a stock engine? Or do you have a snotty cam in it with a lot of overlap?
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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05-26-2013, 10:55 PM
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#6 |
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Registered User
Join Date: Jan 2013
Location: Moyock, North Carolina
Posts: 9
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Re: 72 gmc k15 4x4...HELP lost brakes
Thanks for all the replies,
I took the check valve out to check the vacuum (was good) then I did have a little bit of brake fluid come out of the hole on the booster. Wiped it off and it never showed again. I have a basic 350 with bolt ons no internals. So no cam issues. I will try the master cylinder, as nothing is wet. I will post my results later this week, thanks guys! Posted via Mobile Device |
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