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#1 |
Registered User
Join Date: Sep 2016
Location: BC, Canada
Posts: 16
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C10 Brake Booster
Hey guys,
I installed a brake booster on my truck earlier today. I was told it worked by the person I got it from who repainted it and gave it to me when they sold the truck. I attached the vacuum line on the front of the manifold. Put everything on and the braking doesn't seem to be much easier than when I just had the master. Do you think that this could be a faulty booster or perhaps the brake needs to be adjusted? I almost have it fully extended with leaving about 6-7 threads on the adapter. A bit stumped here. (Did the typical youtube tests and it doesn't seem to be getting any stiffer when stepping on the pedal after vehicle operation). Any help would be much appreciated. Thanks, Mike |
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#2 |
Registered User
Join Date: Jul 2015
Location: Cleveland Texas
Posts: 109
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Re: C10 Brake Booster
To be clear did you remove the master cylinder and now the pedal goes to the floor and does not pump up, or did you just add the vacuum booster and the pedal is still hard to push like with manual brakes? I would check the vacuum pressure and maybe use a hand held vac pump like mighty vac it should take between 18 to 22 in of vacuum to operate the diaphragm.
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#3 |
Registered User
Join Date: Sep 2016
Location: BC, Canada
Posts: 16
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Re: C10 Brake Booster
I removed the master cylinder from the wall, installed the booster on the wall and installed the master cylinder onto the booster. It is still hard to push like manual brakes. I was told I didn't have to bleed the brakes as this was already done by the former owner recently...
I'll have to measure the vacuum pressure. Thanks for your message. -Mike |
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#4 | |
Registered User
Join Date: Jul 2015
Location: Cleveland Texas
Posts: 109
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Re: C10 Brake Booster
Quote:
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#5 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Booster test.
With motor off put foot on brake then start the truck does the brake pedal go further down? If so the booster is working as it should. If not check the booster. Did you check to see if the rod inside the booster is coming into contact with the master cylinder plunger. Some times you have to add a spacer. ![]() ![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#6 | |
Registered User
Join Date: Sep 2016
Location: BC, Canada
Posts: 16
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Quote:
Was going to do that exact check today. If it isn't contacting, can you buy the spacer from your local autoparts store? Posted via Mobile Device |
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#7 |
Registered User
Join Date: Sep 2016
Location: BC, Canada
Posts: 16
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Re: C10 Brake Booster
She's pulling between 16-17 inches of vacuum at idle. So, it leads be to believe the brake booster must be at the end of its life since the manual brakes were working fine before installing the booster.
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#8 |
Registered User
Join Date: Sep 2016
Location: BC, Canada
Posts: 16
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Re: C10 Brake Booster
Picked up a new booster this afternoon and turns out the used one I had was faulty. 👌 Brakes work great
Posted via Mobile Device |
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#9 |
Registered User
Join Date: Jul 2015
Location: Cleveland Texas
Posts: 109
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Re: C10 Brake Booster
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