V6 Mustang Brake Booster Problems

[Brent]

Since getting the car back from having the new engine put it there is a problem with the brakes. It seems like they are not getting enough pressure built up while in areas like parking lots or when first starting the car up and backing up and driving. The brakes do not stop well at all. You can feel the pads hit the rotors when you press the brakes but the car doesn't stop well.

However when driving down the rode this seems to go away.

What would cause this? I took it to a mechanic and they could not single out the problem but hinted at the Brake Booster going bad. Has anyone had experience with something like this before?

[rydog]

its the cam you have, bleeding off pressure less pressure the brake booster

[Brent]

Seriously? Is there any way to fix it? It's pretty bad when first starting up.

[rydog]

I dont know of a way I just dealt with in my 82

what is your vacum at idle?

[Brent]

I found this and it looks like a good solution: Brake Boost

This is probably why the transmission seems to lag a bit when first accelerating from a stop since it requires vacuum as well.

[rydog]

That's the ticket

[Brent]

and here is more reading on it from someone who has done it: Hydro-boost (brakes) - V6Power Messageboard

[Brent]

Another possible solution: Stainless Steel Brakes Electric Vacuum Pump Kits: SSB-28146 - summitracing.com

[rydog]

That ones a bit pricey though I like the GT fix better

[Brent]

Problem is buying all those parts form the Junkyard probably won't be cheap either... then you gotta cuss up a storm taking the whole brake system apart lol...

I got to look into if this would fix the Transmission problem as well.

[greenpony02]

My v6 had that problem too. I think it was the booster but like you said no one could diagnose it. I would just let the car run for about 30 seconds when I started it up if I wanted to avoid the problem all together or I'd just be ready for it the first 30 seconds of drving.

[Brent]

What kind of cam did you run?

[greenpony02]

mine was stock!

[Brent]

Yea then your booster was probably gone then....

[white95v6]

oh man. slow down.

whats your cam? cause i have run Large cams and no issue yet with no haveing enough vacum on the boost for decent stoping. also just buy a $40 Vacum canister. no need for those things you posted about.

also the Trans does not use anything from a Vacum source to run or funstion properly.

if the cam is decent a Stall and a Gear will wake it up Alot.

this is nothing new why are you guessing at a fix?

[Brent]

because its bad enough to where it needs to be fixed and I have never encountered it before. This is my first build period.

It's bad enough at idle where I would like to fix it. I'll look into the Vacuum Canister. I guess the Transmission problem is with the tune then.

Thanks.

[white95v6]

Quote: Originally Posted by Brent because its bad enough to where it needs to be fixed and I have never encountered it before. This is my first build period. It's bad enough at idle where I would like to fix it. I'll look into the Vacuum Canister. I guess the Transmission problem is with the tune then. Thanks.

i didn't say it was not enough of a problem that you should not fix the issue.

again i say what Cam do you have? this will shine some light as to if its your problem or not.

the trans could be a tune,converter or just wore out lol

[Brent]

Sorry forgot that. Its 224/230. I gotta find the spec sheet for the lift specs.

[Brent]

Quote: Originally Posted by white95v6