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Old 03-21-2017, 10:52 PM   #1
jswilke
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Default CPP Brake Booster Kit Nightmare

What ever happened to the days when one purchased a quality made in USA after market part, installed it and drove off into the sunset with no further problems? My recent experience with upgrading my power brake booster/proportioning valve/master cylinder assembly demonstrates those days are long gone.

Last summer I upgraded (57 Chevy) my perfectly functioning 7" dual diaphragm booster/master cylinder/proportioning valve with CPP's latest and greatest all chrome 9" dual diaphragm booster/master cylinder/proportioning valve set up for 4WPDB upgrade...spent alot of $$$. My original 7" setup was understandably marginal in performance due to its size, but it worked OK with front disc/rear drum brakes. I upgraded to rear disk brakes and the larger 9" booster/master/prop valve package for better performance.

Initial installation went well. After installation and proper brake bleeding I could not stop brake fluid leaks from included brake fluid lines from the master cylinder to proportioning valve. I called CPP and they sent me a new line kit no charge. Of course, after installation I had to fully bleed the brakes again...not fun. The new line kit stopped the leaking and all was well for a few months. By the way, the upgrade to a full 9" dual diaphragm booster made a huge improvement in braking.

Then I started experiencing occasional front brake dragging, especially after hard stops. I worked with CPP customer support and together we ruled out front caliper malfunction, master cylinder itself, master to booster preload problem or brake rod to pedal adjustment.

After much discussion we decided it was a faulty proportioning valve causing occasional front brake drag. CPP sent me a new proportioning valve no charge. Earlier this week I installed the new proportioning valve and bled the brakes once again...not fun. So far so good...no more front brake dragging. Also, I noticed the replaced proportioning valve was leaking a little at the front rubber boot. The new proportioning valve had been redesigned and no longer has a fitting or boot on the front.

Anyway, CPP has been good with their customer support through this and they honored their guarantee with parts replacements at no charge each step of the way. I'm glad I can do the work myself, but what an uneeded hassle. What if I had to take my car to a shop each time for parts replacement including brake bleeding? If that were the case my conversations with CPP would have taken on a whole new tone.

Hopefully, now I can ride off into the sunset with no further CPP parts problems.
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'67 Nova SS LS1 (sold)
'30 Ford Sedan 350 TPI SBC (sold)
'34 Ford Sedan 283 3x2 283 SBC (sold)
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Last edited by jswilke; 03-26-2017 at 11:49 AM.. Reason: sp
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Old 03-22-2017, 11:55 AM   #2
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That is hot rodding. If it was easy everyone would do it.
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Old 03-22-2017, 12:28 PM   #3
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Geez Jim, that seems like WAY too many problems to have on a brand new system. Thank goodness they responded that way. A bunch of others here haven't been so lucky.
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Old 03-22-2017, 01:59 PM   #4
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Quote:
Originally Posted by raygreen View Post
That is hot rodding. If it was easy everyone would do it.
Not in my book. Hot rodding is the fun of coming up with all kinds of crazy parts combinations to make a modified car work. I expect newly purchased part to function without premature failure.
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'57 Bel Air Sport Coupe Ramjet EFI 350 SBC
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'55 Bel Air 383 SBC (sold)
'67 Nova SS LS1 (sold)
'30 Ford Sedan 350 TPI SBC (sold)
'34 Ford Sedan 283 3x2 283 SBC (sold)
'28 Ford PU 671 blown 350 SBC (sold)
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Old 03-22-2017, 02:15 PM   #5
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Its great to hear they've given you good customer service and response being that some places would rather not hear any complaints. Keep us updated,hope you get it all worked out.
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Old 03-24-2017, 06:47 PM   #6
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Thanks for the information. We apologize for the issues you have encountered.
If you need anything please feel free to call me direct as well.
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Have you received CPP’s 2016 Product Catalog? Our newest catalog is now available and features full-color images, technical information and hundreds of new parts for your classic GM or Ford trucks and cars. To receive one, please email with your name and address so we can get one out to you ASAP!
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Old 03-24-2017, 06:55 PM   #7
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I know I'm a little late for your party, but as far as brake bleeding goes, an compressed air powered vacuum bleeder from OTC tools (marketed under many other brands) makes bleeding a completely dry brake system a 20 minute process working by yourself.
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Old 05-02-2017, 04:24 PM   #8
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the cpp unit on the 56 is kaka . we have adjusted. vacuum bled , power bled and still have a low spongy pedal . will replace with an s10 set up. too many hrs involved chasing this thing.
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Old 05-02-2017, 07:41 PM   #9
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Quote:
Originally Posted by cpptech View Post
Thanks for the information. We apologize for the issues you have encountered.
If you need anything please feel free to call me direct as well.
So far, Aaron, the new proportioning valve totally corrected my occasional front brake drag issue. I'm amazed at the difference between the proportioning valve that came with my packaged CPP booster/master/prop valve assembly purchased last year and the replacement prop valve CPP sent me earlier this year. Both prop valves are chrome, but the replacement is much heavier than the original. I suspect the original was aluminum and the replacement is brass, the way it should be. Also, the replacement no longer has a rubber boot in the front like the leaking original.

I hope I did get the correct proportioning valve for 4WDB.
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TOYS

'56 Chevy Tow Truck 468 BBC
'57 Bel Air Sport Coupe Ramjet EFI 350 SBC
'08 Corvette Z06 Limited Ed 427 LS7 (338 of 427)
'56 Pontiac Chieftain Wagon ZZ454 BBC (For Sale)
'55 Bel Air 383 SBC (sold)
'67 Nova SS LS1 (sold)
'30 Ford Sedan 350 TPI SBC (sold)
'34 Ford Sedan 283 3x2 283 SBC (sold)
'28 Ford PU 671 blown 350 SBC (sold)
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Old 06-12-2017, 10:02 AM   #10
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rolled the dice and replaced the m/c thinking it was bleeding by. new cpp aluminum m/c. picture tells it all as it was full of metal shavings. back to looking for oem set up .
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