Brake dilemma, need advice

[SCOTI]

What is the vacuum level @ the vac can?

[Painter D]

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.

[SCOTI]

Originally Posted by 69chevyshort

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.

You know someone that does. Let's try & get together this weekend maybe & see what it is??

[Painter D]

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.

[DKN]

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

[skoffice]

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.

[PBFAB.COM]

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?

[Painter D]

Originally Posted by porterbuilt

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?

You're preaching to the choir brother, I find it odd too. The problem has always been there and yes that is why I did the upgrade. Originally three years ago "everything" and I mean "everything" was replaced, mostly with parts from O'reilly. Even then the brakes behaved the same way, I just assumed it was the way it was going to be.


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.

[tires2burn]

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

[derider]

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.