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#1 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,133
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Re: Brake dilemma, need advice
What is the vacuum level @ the vac can?
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#2 |
Registered User
Join Date: Jun 2007
Location: DFW (Forney)
Posts: 1,529
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Re: Brake dilemma, need advice
I have an adjustable prop. valve on the rear line, I'm not sure on the bore size, and it's a disc/drum setup.
SCOTI ,I'm not sure what the vacuum level is at, I don't have a guage.
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
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#3 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,133
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Re: Brake dilemma, need advice
You know someone that does. Let's try & get together this weekend maybe & see what it is??
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#4 |
Registered User
Join Date: Jun 2007
Location: DFW (Forney)
Posts: 1,529
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Re: Brake dilemma, need advice
I'll try, but I have another problem that developed on the test drive for the brakes. My elec. fan decided to come loose and put a small hole in my radiator so now I have to get that fixed.
I swear this truck hates me.
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
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#5 |
Active Member
Join Date: Feb 2008
Location: Los Angles CA
Posts: 136
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Re: Brake dilemma, need advice
Basically there are 2 ways to improve the brakes.
1- Use a bigger booster, or use a Hydaboost. The Hydraboost are the most powerful booster you can get. 2- Use a larger rotor. The CPP 13” kit or the Willwood 14” kit will improve the brake performance. FYI: The D52 caliper has almost the same piston area than the OE caliper. This web address shows the output of different boosters. http://www.classicperform.com/PDFs/B...ssureChart.pdf Danny Nix CPP |
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#6 |
Registered User
Join Date: Apr 2007
Location: Elk Grove, CA
Posts: 375
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Re: Brake dilemma, need advice
Just to throw my 2 cents in, I was working on my buddy's Chevelle recently and he had a booster that was less than a year old that we had come to find out was blown. Also the check valve was blown. If you ever experienced any backfire while tuning your truck that could have blown out your booster. My buddy had the canister and new brake system on his car too. I took the booster out and she was toasted. I'm sure you've checked your drums already too, but just in case, make sure those axle seals aren't leaking onto the shoes.
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1964 C10 Shortened Shortbed Cammed LQ9 P&P 1967 C10 Trophy Truck BB 438 (soon to be worked on again) |
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#7 |
Senior Member
Join Date: Dec 2003
Location: Mesa,Az
Posts: 3,981
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Re: Brake dilemma, need advice
I find it odd that you can't get enough pressure to lock up your brakes, especially with the upgrades you have made. Has the problem always been there? Is that the reason you upgraded the brakes to begin with? If the problem was present before the upgrades, what components have NOT been replaced yet?
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www.PorterbuiltFabrication.com Phone: 480-297-2621 E-mail: sales@pbfab.com Find us on FaceBook under Porterbuilt Fabrication Specializing in Chassis and Suspension Components for your Classic Chevrolet Truck. We offer components from the following manufacturers: Porterbuilt Accuair Ridetech (Air Ride Technologies) Air Lift Wilwood Intro Unisteer ECE Gotta Show Air Lift Borgeson CPP Supporting this forum since 2003! |
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#8 | |
Registered User
Join Date: Jun 2007
Location: DFW (Forney)
Posts: 1,529
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Re: Brake dilemma, need advice
Quote:
To the best of my knowledge the rear brakes work perfectly it's only the front ones that seem to just not get enough pressure. The lines aren't clogged ,I get plenty of fluid when I bleed them just not enough pressure I guess. Could I possibly need a new MC ,maybe one that has more pressure than stock. I do know for sure it's not the calipers, rotors, hoses, or pads they only have about 4 miles on them and they are brand spankin new. ![]() ![]()
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
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#9 |
Registered User
Join Date: Apr 2009
Location: Tacoma,Wa
Posts: 84
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Re: Brake dilemma, need advice
Have you broken in the pads? some times it takes quite a while for them to seat in. Four miles doesn't sound like enough. Maybe somebody else has some info on breaking pads in. good luck
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#10 |
Registered User
Join Date: Feb 2009
Location: Deforest, WI
Posts: 90
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Re: Brake dilemma, need advice
Do you feel it when your booster gets vacuum with your foot on the brake and starting the truck? I thing something is up with your booster. Also really double check the brake push rod adjustment. You have some component not working, the stock disc drum stuff should lock up no problem! You don't need a more powerful mastercylinder or booster.
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