GiDvEtTe84

I have an 84. This only happens when its cold (about 50 degrees F and under) My brakes seem very hard, especially if I apply them quickly. It feels as if the booster is not working. My booster is brand new/rebuilt and the master cylinder is only a couple of years old as well. It seems like there is good vaccum to the booster but its hard to tell. The line from the intake to the booster does not seem the have any leaks and my engine does not run with a high idle like I would have a Vac leak. I really need to get this figured out because its nearing winter time. I would also like to ask if any one has a diagram of the 84's vac lines. Thanks.

bogus

that sounds a lot like a bad booster... the diaphram inside is failing.

Considering the quality of reman'd parts for Vette's, that's where I would start.

GiDvEtTe84

Seems like it. But why does it work when ots warm outside? Very suspicious. It does work better after the engine compartment warms up.

vinnies87

good question: but does seem like a booster problem anyway.

yoslambo1@cs.com

My 84 has been doing this for years! Only acts up when its cold! :crazy: As soon as warm weather comes or car gets hot problem is solved? I am gonna try & change all my brake fluid someday. :smash:

GiDvEtTe84

Yes! Thats my problem! I wonder if it could be the master cylinder as well. Its not very old but it is remaned.

yoslambo1@cs.com

If you ever figure out whats wrong drop me an email....I would love to fix that issue. :smash:

CFI-EFI

No! POST IT! I haven't had this problem...yet, but "inquiring minds want to know". Keep us up to date. Good luck, and...

RACE ON!!!

HWoods

Gid, my 84 has this same problem. Have not figured it out yet. There is a filter of some type on the vaccum line going to the booster. Maintence schedule says it is supposed to be replaced every 10,000 miles. Mine has never been replaced. I bought a reman'd booster too, but have not put it on yet. My guess is it is in the booster.

GiDvEtTe84

Thanks Lynn. I changed the booster. I guess it could be a bad remaned booster but i doubt it. I will try bypassing the filter thing next. What is it for anyway?

oldace84

My lowly '84 does the same thing.
Even with all new parts.
Is that normal?
All the good guys. All of you, you know whom I mean.
tony



[Modified by oldace84, 1:23 PM 10/28/2003]

oldace84

Gid,
Haven't seen you on this forum in awhile.
Welcome.
When will the crossfire forum be up and running?
thanks
tony

yoslambo1@cs.com

My car has been doing this since I bought it.....I am glad I dont drive it in the winter! :smash:

GiDvEtTe84

I wish I didnt have to drive mine in the winter wither, but I just sold my truck so the Vette is the primary vehicle for me again. Thats why I have to fix it.

I have no clue when the Crossfire Injection Vault will be back up. I have not heard anything new. I do know that Ken is supposed to be getting Cable data service today so maybe we will see something soon. Sorry for the long wait. I too am having withdrawls. :crazy:

GiDvEtTe84

About that filter, can anyone tell me how it works? Is there a check valve inside? Thanks.

neverendingproject

yes , its a check valve.

GiDvEtTe84

I just went check the filter, i am able to blow through it both ways fairly easily. Doesnt seem like a check valve.

edsalinas

Just guessing here:
When it's cold, rubber parts (metal also to a lessor extent) shrinks. As things heat up, they expand, closing up some tolerances?????

:crazy:
:confused:

GiDvEtTe84

Exactly why I thought it was the booster. But i have tried that $130 shot in the dark. Maybe other rubber connections. When it is cold, my idle does not go up like it would if i had a vacuum leak? :banghead:

edsalinas

Ummmmmm, well there's o-rings in the MC and out in the calipers???

But somebody said they rebuilt the whole system and still had a problem?

:confused: :confused: :confused: