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04-27-2017, 11:24 AM
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#1 |
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Registered User
Join Date: Feb 2015
Location: Fair Grove Mo
Posts: 103
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72 Brake Problems
I cant figure out what is wrong with my brakes on my 72 K10.... I have replaced the rear wheel cylinders and break pads and it seems like it is getting air in the lines somewhere, but all of my brake fluid is still in it and nothing is leaking out... If I bleed the brakes then they stop good for the first drive then the brake light comes back on and it will hardly stop..... should I try bleeding the master cylinder or what? Thanks in advance!
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04-27-2017, 11:56 AM
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#2 |
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Registered User
Join Date: Sep 2016
Location: Homosassa Florida
Posts: 29
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Re: 72 Brake Problems
sometimes the rear rubber hoses collapse internally if they are old
bleeding the lines fully i had to do it several times among other issues |
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04-27-2017, 11:59 AM
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#3 |
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Registered User
Join Date: Sep 2016
Location: Homosassa Florida
Posts: 29
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Re: 72 Brake Problems
if you have a ccp proportioning valve you need to use the screw in tool to keep the piston in place so it doesnt shut off the rear brakes while bleeding them
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08-25-2017, 08:21 PM
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#4 |
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Registered User
Join Date: Feb 2015
Location: Fair Grove Mo
Posts: 103
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Re: 72 Brake Problems
How do I know if it's a CCP proportioning valve?
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08-27-2017, 10:30 AM
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#5 |
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Post Whore
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,350
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Re: 72 Brake Problems
Post a picture and maybe someone can ID it for you.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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08-27-2017, 11:18 AM
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#6 |
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Registered User
Join Date: Feb 2015
Location: Fair Grove Mo
Posts: 103
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Re: 72 Brake Problems
Should I take the tire off to take the pic? Or would a top view work?
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08-27-2017, 03:14 PM
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#7 |
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Senior Member
Join Date: Oct 2013
Location: Santa Paula, CA
Posts: 630
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Re: 72 Brake Problems
If you're experiencing brake fade, ( Like when you're at a stop light applying the brake pedal and you start to creep forward without lifting your foot so you apply more pressure to the point where the pedal is basically on the floor.) then you have a bad master cylinder.
The master cylinder can develop a "Internal Leak" where the interior seals of the master cylinder fail and fluid pressure loss occurs. It will not leak externally and will not lose any fluid, but it fails to contain the required fluid P.S.I. for proper brake operation. Your brake booster (if you have one) does not and will not affect your braking systems ability to stop your vehicle. The brake booster is solely responsible for -assisting- in the application of the brakes. If your brake booster were to fail, you would still have complete control and ability to apply the brakes, it would just take a lot more effort on your part to apply the brakes.
__________________
1972 C/10 LWB - Mine 1964 C/10 LWB - My Dad's Instagram: Mike_The_Grad |
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