no boost no brakes

TURBO93GT · 06-30-2008

i have lost all brakes and no boost will build. i have found no vacum
leak. car has 5 in of vacum at idle, 16 in at 1500 rpm. i have no hair left on my head

PLEASE HELP

heavy metal · 07-01-2008

Welcome to the site! What year,engine,etc?More info please.

beetlejuice · 07-01-2008

Shot master cylinder maybe unless it's just your booster check valve or booster itself.

TURBO93GT · 07-01-2008

93 Gt 306 8.5:1 Comp Comp 284hr Cam For Blower, I Am Thinking About Switching To Manual Brakes.

heavy metal · 07-01-2008

Have you checked the valve at the booster?

TURBO93GT · 07-01-2008

I Have Checked It Only Worked One Way. Why Is My Blowoff Valve Not Opening. The Car Is Pulling Vacum But Nothing Works.

TURBO93GT · 07-01-2008

Well Manual Brakes Or Power Brakes. This Is Not A Daily Driver Just For Fun And Playing Around. Single 67mm Precision Turbo. What Would You Do.

beetlejuice · 07-02-2008

I'd stay with the power since I'm sure it's somthing simple and power helps stop the car a little quicker than manual. When you say you've lost all brakes do you mean the brakes don't work at all? If you push real hard on the pedal does it stop? If the booster isn't working then it should still stop but with a lot of force.

TURBO93GT · 07-02-2008

You Have To Stand Up On The Pedal Just To Get It To Slow Down. Nothing To Race With, Just Wont Work For Street Driving

beetlejuice · 07-02-2008

Does it feel like manual brakes now or can you still feel the boost from the vacuum booster? Will the brakes lock up if you stand on it as hard as you can when at speed? Also, is the booster making a hissing/leaking sound?

TURBO93GT · 07-02-2008

No It Makes No Noise. Will Not Lock Up Even In Gravel

beetlejuice · 07-02-2008

Can you feel the assist from the booster at all? I'm trying to pinpoint if it is your booster or master cylinder. It has to be one of them.

TURBO93GT · 07-02-2008

No Its The Same As If The Motor Is Not Running. We Have Even Used Several Vacum Testers Just To Make Sure One Was Not Bad. The Brake Pedal Stays Stiff All The Time, And Makes No Noise At All. YOU CAN BLEED THE BRAKES AS IF NOTHING IS WRONG. BUT SOON AS YOU DO THE BRAKES STAY THE SAME NO MATTER WHAT YOU DO.

beetlejuice · 07-05-2008

I'd say either replace the little check valve on the booster and/or buy a rebuilt booster or have your original rebuilt. Here's just one place that does it if you want to make sure you get your original back-
Booster Dewey Power Brake Booster Exchange Inc.

TURBO93GT · 07-09-2008

IT ALL WORKS HAD A BAD SET OF INTAKE GASKETS LEAKING INTO THE LIFTER VALLEY.

THANK YOU ALL FOR YOUR HELP.