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05-21-2015, 05:53 PM
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#1 |
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Registered User
Join Date: May 2014
Location: Rose Hill NC
Posts: 193
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72 K5 Hard brake problem
I am having trouble with my brakes being hard to mash. It has decent brakes, but I have to mash really hard to get them to work. Everything to do with the brake system is new (booster,brake lines,calipers, cylinders,shoes,pads,proportioning valve,etc.). The brake light also stays on. I have been told to check the vacuum ,so I did and it appears to be real good. Anybody have any good ideas! Thanks
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05-21-2015, 06:29 PM
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#2 |
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Registered User
Join Date: Mar 2015
Location: susanville ca
Posts: 1,170
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Re: 72 K5 Hard brake problem
sounds like the power/vacume is not working,first bleed the brakes good you might have air in the lines,
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05-21-2015, 09:09 PM
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#3 |
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Registered User
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 215
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Re: 72 K5 Hard brake problem
Soundsike you have a booster issue. Check vaccum, if hydro boost check for leaks. Air in the lines would give you a mushy/low pedal
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05-21-2015, 09:27 PM
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#4 |
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Registered User
Join Date: Feb 2015
Location: Onalaska Texas
Posts: 59
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Re: 72 K5 Hard brake problem
First off, it the engine stock ?? If you have a big cam you may not be able to create Vacuum enough to power the New booster.
put a vacuum gauge on the line going to the booster, start truck and see if you generate 14 inches of vacuum. If you have 12 or below the booster will not operate and you will need to stand on the peddle. |
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05-21-2015, 09:51 PM
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#5 |
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Senior Member
 Join Date: May 2011
Location: Greencastle PA
Posts: 6,799
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Re: 72 K5 Hard brake problem
I am guessing since the brake light is on the proportioning valve is tripped one way. Possible it is stuck if bleeding does not fix it and why the brakes are not real good. Bleeding the brakes may equalize the pressure and reset the brake light and start working properly. If that doesn't work and you know the all the air is out of the system I reset a safety switch on the proportions valve but it was about 25 years ago. If I remember correctly I removed the safety switch from the valve and used a pick to recenter it but it has been a long time LOL.
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05-22-2015, 09:21 AM
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#6 | |
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Senior Member
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,764
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Re: 72 K5 Hard brake problem
Quote:
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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05-22-2015, 02:48 PM
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#7 | |
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Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: 72 K5 Hard brake problem
Quote:
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05-23-2015, 03:45 PM
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#8 |
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Registered User
Join Date: May 2014
Location: Rose Hill NC
Posts: 193
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Re: 72 K5 Hard brake problem
Thanks guys for all the info!
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