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#1 |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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CPP Brake Booster and Master Cylinder Kit Issues
Bought the CPP Booster and master kit through LMC. Had a few questions since the instructions are extremely lacking.
Does this mounting orientation look correct? I’ve never seen a master cylinder that is tilted that far down. Can’t see another way to get the booster mounted though. Second - should the rod coming out of the booster be that close to the firewall? It has no vacuum on it so I dot want it to dent the firewall or damage itself if that rod is going to come out or something once vacuum is applied. |
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#2 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: CPP Brake Booster and Master Cylinder Kit Issues
It looks like mine too. I got my kit from GMC Pauls and thought it looked more slanted down than the originals. The black assembly below is original equipment and the gold anodized is the new kit. Sorry the pics are not at the perfect angles, but your install looks correctly assembled and my push rod was very close to the firewall too. Keep in mind that my truck has a bit of a raked stance which amplifies the angle.
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#3 |
Registered User
![]() Join Date: Dec 2018
Location: Atlanta, GA
Posts: 43
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Re: CPP Brake Booster and Master Cylinder Kit Issues
I got the same kit recently. The rod was the wrong length and the booster was bad right out of the box (didn't hold vacuum, hard pedal). Spent a lot of time troubleshooting and straightening out the issues. My setup doesn't angle down as much. Will post a photo later.
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#4 |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,526
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Re: CPP Brake Booster and Master Cylinder Kit Issues
I realize yours is pointing downward but I think pedal geometry may be the reason as stated here.
https://www.hotrod.com/articles/old-...-upward-angle/ |
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#5 | |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Quote:
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#6 | |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Quote:
The other two rods (From the pedal to the lever and from the lever to the booster) appear adjustable. |
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#7 | |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Quote:
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#8 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: CPP Brake Booster and Master Cylinder Kit Issues
I have not dug into what the right and wrong rod lengths are, and hope no to have to, but I don't think the booster/master assembly can be mounted any other way...it's going to slant down. If you zoom in on my left photo...you can see that the brake "stuff" that was on the truck 25 years ago when I bought it slanted down too...about the same amount. I'll try to get some better pics.
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#9 |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Oh, I meant which of the three rods was the one with the incorrect length. I was assuming it was the booster to master cylinder rod that was the wrong length, but there are three rods on the system.
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#10 |
Registered User
![]() Join Date: Dec 2018
Location: Atlanta, GA
Posts: 43
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Re: CPP Brake Booster and Master Cylinder Kit Issues
The rod between the booster and master cylinder was too long. The booster not holding vacuum was a separate issue.
The pedal geometry also had to be corrected because the truck was originally manual brakes. Additional hole was drilled to correct this. Edit: I should also add that a Wilwood caliper/disc setup is used on the front. Rear brakes are still drum. Last edited by yysenhimer; 02-19-2020 at 02:03 PM. |
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#11 | |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Quote:
How far did you move the hole? Up or down? |
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#12 |
Registered User
![]() Join Date: Dec 2018
Location: Atlanta, GA
Posts: 43
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Re: CPP Brake Booster and Master Cylinder Kit Issues
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#13 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Here are some better pics from my archives of original brake components.
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#14 | |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Quote:
For your pro-valve there -- Are the two lines in the front (the one on the top and the front bottom one) going to each side of the front axle without linking anywhere? |
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#15 |
Registered User
![]() Join Date: Dec 2018
Location: Atlanta, GA
Posts: 43
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Re: CPP Brake Booster and Master Cylinder Kit Issues
The lines go to a connector near the caliper where it is converted into a braided line that connects the caliper.
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#16 |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Each one goes to a separate side? The line kit I have is made to use a combiner to split a single line to the front axle from the master cylinder. Seems I’ll have to get some straight line and bend it all myself to use the pro valve that came with this kit.
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#17 |
Registered User
![]() Join Date: Dec 2018
Location: Atlanta, GA
Posts: 43
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Yeah I've got each front feeding a separate side. The single rear line feeds the rear drums. A few companies sell pre-bent lines.
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#18 |
Registered User
Join Date: Feb 2019
Location: Navarre, Florida
Posts: 199
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Re: CPP Brake Booster and Master Cylinder Kit Issues
Yeah, the prebent ones I got from LMC are bent.
What they are bent for, I have no idea. |
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