Question about 2006 Buick Grand National

3 Answers

Buick Grand National vacuum brake conversion

I recently changed my '87 Buick " T " over to vacuum brakes, I used a set-up off an '86 Caprice 10 3/4" booster w/master cyl. All the parts bolted up ok but I had to drill and tap the intake plenum in order to get 16.5-17" vacuum. The pedal is pushed all the way back to it's limit installed. Pedal seems Stiff to push, and is Hard then goes down off panic stops. Will not even lock up front brakes on hard stops. This set-up does not work much better than the Powermaster. Whats going on here???? Any help would be greatly appreciated.

Posted by on

Ad

3 Answers

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 31 Answers

^ Turbo Cars have Lots of Vaccum, Where did you ever get this idea from. I have personally converted 10+ Turbo Buicks to Vac brakes.

Make sure the check valve is okay at the booster. but it does sound like you have a bad booster.
Also, did you change the brake pedal to a Vac brake pedal?
They are not interchangeable.

Also, you should not have drilled the plenum, you can get a vaccum block to replace the plastic one on the top of the plenum with a vac brake port.

Posted on Jan 29, 2009

  • 1 more comment 
  • Bill Jan 07, 2010

    The only time a Turbo car has no Vaccum is under boost.



    This is why we use check valves when converting to Vaccum brakes.



    I have a Boost/ vac gauge on my car and see 17' of vaccum at idle.



    Turbo cars HAVE LOTS of Vaccum because they do not usually have cam shafts that have overlap.

  • billg87 Sep 12, 2010

    i need info on getting the vac block/vac port and any other part needed to change to vac system on buick gn

  • macguyver126 Dec 19, 2010

    please call 803 477-6065 have to covert one myself hope this gets through haveing trouble with this site

×

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 57 Answers

It sounds like the vaccumn canister is not holding vaccumn.( weak or cracked diaphraim) Also did the swap come with a regulator valve (porposting) to set rear and front psi? Make double sure the system is bled well.. In addition the master cylcinder has a shuttle rod that must be centered up in order to porposition the fluid front and rear.Have a fun day and good luck.

Posted on May 14, 2008

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 3,113 Answers

Turbo cars do not have enough vac. for a system like that. Get a vac. pump.

Posted on Jan 06, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a 64 impala I want to put disc breaks in front is there a car that would enter change with it


buy it yourself cheaper Impala disc brake conversion


get rotors from
69-74 nova
70-72 monte carlo
67-72 chevelle
69-72 gto
69-72 grand prix
69-72 buick skylark
69-72 buick grand sport
69-72 buick apollo


use the bearing and seals for the car you u choose to get the rotors from


calipers
75-75 nova
73-76 monte carlo
73-76 chevelle
73-76 grand prix
73-76 GTO
73-76 tempest


must use original power brake booster from 61-64 impala

must use a master cylinder from 71-72 impala deep cup bendix part number 10-1496

71-80 gm combination valve

73 chevelle brake hoses

must buy brackets for the calipers, many places in super chevy magazine sell them cheaply!!!

Nov 01, 2014 | Cars & Trucks

3 Answers

1987 buick grand national has brake light on. the peddle is very stiff but with some force it goes to the floor the car has some kind of brake system that does not have a booster it has a black ball it is...


I dont know why you would put a car on stands and put the parking brake on? where was it going to go? Was the fluid low or was there any brake fluid leak? I suspect the proportioning valve may be stuck. Thats why you are not getting fluid to all 4 wheels.

Aug 27, 2010 | 1987 Buick Regal

1 Answer

87 caprice, break light stays on?, battery


Its probably a siezed or failed micro-switch which engages when you put your foot on the brake pedal or engage the hand brake.

I don't knw where exactly but both switches will be located near to their respective mechanisms.

May 11, 2010 | 1987 Chevrolet Caprice

1 Answer

87 buick grand national power antenna went up, but won't go down.


There is a cable and motor that actuates the antenna, the cables break on these all the time.

you can get replacement cables at nos4gn.com

the passenger fender needs to be removed to access the antenna assembly.

Sep 26, 2009 | 1987 Buick Regal

1 Answer

1987 Buick Grand National losing power, changed


Symptoms Like this usually point to the Fuel pump.

Also these cars suffer from inferior wiring to the fuel pumps and a substantial Voltage drop is noted between the Fuel pump relay and the Pump harness.

The fix for this is a "Hotwire" Kit

Fuel pump kits with a Hotwire kit are available at numerous Buick performance Vendors but the best stuff in my opinion come from Racetronix,com

You should also change the Prom Chip in the ECM to a modern
Chip from Turbotweak.
This will improve driveability greatly.

HTH

Aug 14, 2009 | 2006 Buick Grand National

1 Answer

Put new fuel pump in 87 buick grand national now it will not turn over


i have a 1987 buick grandnational and put a new fuel pump in and the car will run about 5 min then just shut off

Aug 13, 2009 | 1987 Buick Regal

2 Answers

1987 Buick grand national intermittent lack of boost to brakes.Not the best stopping power at best and sometimes no boost at all. All new brake lines, new cylinders front, new disks and pads as well as...


Sounds like the accumulator ball on the side of the master cylinder. I don't know how to check it,but what ever you do just don't unscrew it with out knowing what you are doing they have to have the pressure taken out of them by pressing the brakes at least 10 times with the engine off. That thing will take off like a rocket if you don't. Or the simple thing is air in the lines start bleeding from the furthest tire to closest.

Jul 27, 2009 | 2006 Buick Grand National

1 Answer

Regarding the vaccum braking system


May I suggest that you go to Howstuffworks.com-"Auto Channel"

1.Howstuffworks- "Auto Channel"
http://auto.howstuffworks.com/
Scroll down with your eyes, and look at the left column. I would like to suggest you click on ->
Auto Parts & Systems

Under the heading -> Explore These Categories,
I would like you to click on -> Brakes
Now click on each heading, to peruse the different categories involved with the automotive braking system.

Forgive me if these are subjects you have knowledge of already, but in your statement of engineering, I didn't see Automotive Engineering listed. I believe the entire automotive braking system will have be understood, before one can lecture on the vacuum braking system itself.

This is the start, of the Howstuffworks article of How Power Brakes Work, (Vacuum Braking System),
http://auto.howstuffworks.com/auto-parts/brakes/brake-types/power-brake.htm



May 10, 2009 | 2006 Buick Grand National

1 Answer

My 87 caprice looked up steering and brakes when I ran out of gas. As a result I hit a car. Where can I find the proof of this occurance to show the ins. company? Thank you


when you ran out of gas the engine died causing you to lose your power steering and power brakes you still had steering and brakes it just didnt seam that way cause u were used to the ease of pwer steering and braking. its as simple as that

Mar 26, 2009 | 1987 Chevrolet Caprice

1 Answer

Switch out a dashboard in an 85 regal


sign up at turbobuick.com (it's free)..I can almost guarantee that someone there nows how and will give you step by step instructions

Mar 20, 2009 | 1985 Buick Regal

Not finding what you are looking for?
Cars & Trucks Logo

2,342 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts

yadayada
yadayada

Level 3 Expert

77514 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...