Question about 1992 Buick Regal

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1992 Buick Regal Gran Sport 3.8 and I want to replace the brake component, help?

There is a small 2 by 2 plastic box connected to my brake booster/master cylinder.It is bolted beside the intake manifold.I broke 1 plastic arm off when replacing the vacuum line.Could someone please identify this box so I can replace it.

Posted by John David on


1 Answer

Randy Ohler

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First it is a junkyard or dealer item. I know what you need but don't know the name. Vacuum junction box is what I call it. There are many shapes and sizes. I call a dealer, tell them what I am looking for. They fax a picture and I pick out there number.

Posted on Jul 29, 2015

  • 2 more comments 
  • John David Jul 29, 2015

    Would this cause the engine to lose power and idle roughly?Also would it cause my transmission to make a loud clunk when placing in gear?I noticed this when I drove it half a mile.

  • Randy Ohler Jul 29, 2015

    No, it would cause the engine to rev higher than normal. The cluck could be there because of higher RPM's. This could be a bad engine or transmission mount.

  • John David Jul 30, 2015

    I used a high temperature silicone and vacuum hose over the hole on the junction box and connecting steel line.Car runs normally now

  • Randy Ohler Jul 30, 2015

    So glad you found a cheap fix. I fix charcoal canisters this way. Except I heat the steel tube up and melt it into the canister and the fitting/nipple that broke. The silicone it lightly. Works every time.



5 Related Answers


  • 1 Answer

SOURCE: brakes

Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.

Posted on Mar 03, 2009



  • 6 Answers

SOURCE: Excessive Oil consumption, 1995 Bonneville Vin K 3.8

The PCV valve gets it's vacuum from the plenum itself. Some 3.8L have different types of connections on the top of the valve (electrical or mechanical), but none have a vacuum line on them.

If you replaced the lower intake gaskets, it is very likely they crushed around the intake bolts. This will cause oil to leak into the intake and pool in the recesses of the lower intake. You are also likely to be leaking anti-freeze.

This is a very common problem with OEM gaskets. After market gaskets made by Fel-Pro have metal rings in them specially to stop this problem. They are available at NAPA and other stores.

Posted on Jun 06, 2009


  • 16 Answers

SOURCE: after replacing master cylinder, right rear wheel

when you are bleeding the system with the engine stopped ,you are pumping the brake pedal and fighting against the resistance of the vacuum chamber spring and you are not getting full pedal motion when bleeding.When you start the engine ,the vacuum created by the engine overcomes the spring force and allows the brake pedal to compress the brake piston itself and show the real position of the master cylinder piston.Start the engine while bleeding the brakes.

Posted on Jul 07, 2009


Nate Stansfield

  • 11896 Answers

SOURCE: 2003 Ford Taurus stalls at idle

go to and register for free. You will then have a full free online repair manual with step-by-step directions, diagrams, troubleshooting, testing, replacing, and more. As an automechanic myself, this a wonderful site.

Posted on Jul 09, 2009


  • 64 Answers

SOURCE: Fiat Uno Pacer - Brake Booster not assist braking

it could be that the master cylinder is bad or the brake booster is bad also check the vacum hose going to the brake booster if it has a hole in it it will lose pressure and make the engine lose rpms

Posted on Aug 23, 2009

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