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#1 |
Registered User
Join Date: Jun 2008
Location: provo, ut
Posts: 69
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1970 c10 brakes problem
ok, so this last week the brakes started feeling like i had to push a little too hard to engage the brakes, so I adjusted all 4, tightened and adjusted all the drum brakes like i always do. now in the last 2 days it grabs much better, buuuutttttt, when i slow down, or am waiting at a stop light, the pedal will slowly get softer and softer and i've even had it go as far as it can and my brake light comes on. The front shoes are fine, the rears will need to be replaced in the next couple of months, but I am clueless as to why they are all of a sudden going soft when i'm waiting for the light. They are power boosted, and i'm stumped. HELP!
seriously any help is very appreciated. Thanks. |
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#2 | |
Registered User
![]() Join Date: Oct 2007
Location: Orem, Ut
Posts: 132
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Re: 1970 c10 brakes problem
Quote:
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#3 |
Registered User
Join Date: Jun 2008
Location: provo, ut
Posts: 69
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Re: 1970 c10 brakes problem
hey you live right down the road from me.
I will try that, my first thought was booster, but i guess that'd make the pedal stiff not soft. hmmm. will go out and play with it this weekend. |
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#4 |
Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: 1970 c10 brakes problem
If you're not pumping fluid out the wheel cylinders then you probably have a bad master cylinder. Fluid is bypassing inside.
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#5 |
Registered User
![]() Join Date: Oct 2007
Location: Orem, Ut
Posts: 132
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Re: 1970 c10 brakes problem
Let me know how it goes, I just did the brakes on my 69 (I converted to front disc though). I have manual brakes too, so maybe someone else can chime in on if the booster could cause the pedal to go soft. My guess is no. If you can't get it maybe I could come by and help out.
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#6 |
is Certifiable
Join Date: Feb 2008
Location: Hinesville, Georgia
Posts: 160
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Re: 1970 c10 brakes problem
Yeah definitely sounds like a bad wheel cylinder or a bad master cylinder. If it is triggering a brake light, the the metering valve is moving. So I would look at the wheel cylinder first.
__________________
1972 Chevy C10 LWB 350 Auto Blue with a white roof. |
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#7 |
Registered User
![]() Join Date: Oct 2007
Location: Orem, Ut
Posts: 132
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Re: 1970 c10 brakes problem
Ok, sorry for the double post, and some one can correct me if I am wrong, but a couple more questions:
Is the fluid level staying the same or do you have to fill it often? Do you have good braking initially? I just checked with the auto teacher at the high school I work at and he said the booster just aids in stopping and will not cause to pedal to go to the floor while sitting (that's what I thought). If you are not loosing fluid check to make sure the rubber hoses are not ballooning anywhere. If the rubber hoses are good and you are not loosing fluid, it may be an internal leak in the master cylinder. If that is the case, I have a new cylinder for a drum, drum setup that I can't use that I would be willing to let you have. Let me know how it turns out. |
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#8 |
Registered User
Join Date: Jun 2008
Location: provo, ut
Posts: 69
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Re: 1970 c10 brakes problem
Now that i think of it, i had this problem with my 77 like 6 years ago and it was a wheel cylinder. that sounds right but i will let ya know what happens this weekend.
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#9 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,134
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Re: 1970 c10 brakes problem
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#10 |
Registered User
![]() Join Date: Nov 2007
Location: Turlock California 95380
Posts: 2,075
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Re: 1970 c10 brakes problem
A quick way to rule out the master cylinder is to undo your brake lines, and plug the m/c lines, your pedal should be rock hard. But if you are having to add fluid because the brake light is coming on, then possibly your wheel cylinder(s) is leaking, causing the pressure differential switch or low fluid sensor to activate the brake light. If you have air in your lines, that would cause the low brake pedal also.
__________________
72 C20 Longbed 05 1500 Z71 |
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#11 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 1970 c10 brakes problem
just look under the truck at the backside of the tires. If there's a leaking cylinder, you'll know it.
Otherwise (and more likely IMO) it needs a master cylinder. |
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