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06-08-2022, 12:22 PM
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#1 |
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Registered User
Join Date: Jan 2009
Location: South Carolina
Posts: 261
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1969 C 10 brakes
Drove my old truck this morn for the first time in several weeks . Brakes are always grabby when I first use them after it's sat this long . Have drum brakes all around . Noticed this morn the left front locked up . Always figured it's rust on the drums ? Just curious . Thanks !
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06-08-2022, 02:34 PM
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#2 |
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Senior Member
 Join Date: Jan 2016
Location: massachusetts
Posts: 326
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Re: 1969 C 10 brakes
My truck had a similar problem, pulled hard to the right. Found the left flexible brake hose was collapsed inside not letting any brake fluid pass and all the pressure going to the right.
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06-08-2022, 02:40 PM
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#3 | ||||
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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: 1969 C 10 brakes
Leaky wheel cylinder will do that too. On my '70 if I ever have to make a quick right hand turn, all I need to do is hit the brakes hard and let go of the wheel...
  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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06-08-2022, 03:19 PM
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#4 |
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Registered User
Join Date: Jan 2009
Location: South Carolina
Posts: 261
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Re: 1969 C 10 brakes
Should've said the brakes are fine after the first stop or two . Yeah Paul , my 1974 truck did the same thing . It had front disc brakes . Thanks
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06-08-2022, 06:20 PM
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#5 |
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Registered User
Join Date: Jun 2016
Location: Bremerton, WA
Posts: 171
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Re: 1969 C 10 brakes
The wheel cylinders could be rusty so the cylinder pistons can't return or the brake hose is blown internally through the liner so it is holding pressure.
When a vehicle sits with moisture in the brake fluid, it can rust things. Brake fluid is hydroscopic so it will absorb moisture from the air and after time degrade your steel parts. Your Master Cylinder cap gasket is supposed to be air tight and the gasket is supposed to accordion down when the fluid level drops so that it does not draw in air. If the fluid is low and the gasket is not stretched down to the level of the brake fluid, replace this gasket as it is allowing air to get to the fluid. Whatever you find to be the cause of the locked front brake, the whole system will need flushed out and brake fluid replaced. If one brake hose is bad, I would replace all three of them. If one wheel cylinder is bad, the others are not far behind. At least inspect them. Replace the brake fluid with new fluid from an unopened container. Any uncapped container of brake fluid that has been sitting should be thrown away, since its been absorbing moisture in the air the whole time the cap was off. In a pinch, if you need to use it, you can boil the water out of brake fluid on a stove. It will boil off the water way before the brake fluid will vaporize.
__________________
1969 Custom Camper C20; Factree Air, 350/TH400/Dana 70U with C30 wheel cylinders, Disk brakes, H4 conversion, headlight relay mod, 3G 135 amp alternator. 7500 GVW |
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06-08-2022, 07:56 PM
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#6 |
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Registered User
Join Date: May 2011
Location: Northern Calif.
Posts: 3,589
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Re: 1969 C 10 brakes
All of the above is why I'm doing this.
 Did the backs last week.
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06-09-2022, 12:14 AM
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#7 |
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Registered User
Join Date: Mar 2015
Location: washington
Posts: 2,162
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Re: 1969 C 10 brakes
I would pull the drums. Nothing answers a question better than an visual inspection.
I'm going with GASoline71 "Leaky wheel cylinder will do that too". |
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06-09-2022, 12:21 PM
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#8 |
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Registered User
Join Date: Jan 2009
Location: South Carolina
Posts: 261
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Re: 1969 C 10 brakes
Drove it this morn and the brakes were fine . I'll check the things mentioned and post what I find . Master cylinder is full . Checked my book and I last changed the brake hoses in 2005 . May be time for new hoses ? THANKS everyone !
Last edited by 697498chevy; 06-09-2022 at 12:56 PM. |
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06-09-2022, 01:39 PM
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#9 | ||||
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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: 1969 C 10 brakes
I think mine are OE from 1970... I should look at changing mine too...
I just did the rear drums last week, and the drums were original to the truck. It's my Dad's 1970 that he bought in 1974 and has 68,000 miles on it.  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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06-09-2022, 07:09 PM
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#10 | |
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Registered User
Join Date: May 2011
Location: Northern Calif.
Posts: 3,589
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Re: 1969 C 10 brakes
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06-10-2022, 11:09 AM
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#11 |
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Registered User
Join Date: Jun 2016
Location: Bremerton, WA
Posts: 171
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Re: 1969 C 10 brakes
If your replacement drums do not have the adjustment slot, use your original to mark where the window is supposed to go and drill it out. Most of the Chinese or India import drums are not coming with this window.
Without the brake adjustment window, when your brake shoes wear in a nice groove on the drums (which are typically softer than OEM), there will be no way to get the drums back off without backing off the brakes via the brake adjuster wheel. You will have to cut the drums off or drill a hole and try to access the adjuster wheel.
__________________
1969 Custom Camper C20; Factree Air, 350/TH400/Dana 70U with C30 wheel cylinders, Disk brakes, H4 conversion, headlight relay mod, 3G 135 amp alternator. 7500 GVW |
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06-10-2022, 07:46 PM
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#12 | |
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Registered User
Join Date: May 2011
Location: Northern Calif.
Posts: 3,589
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Re: 1969 C 10 brakes
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