# Break System & Air Conditioning **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, lumina\ **Created:** [March 11, 2010, 11:06pm UTC](https://community.cartalk.com/t/break-system-air-conditioning/45942 "2010-03-11T23:06:33Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![monivenus](https://avatars.discourse-cdn.com/v4/letter/m/b77776/32.png) [@monivenus](https://community.cartalk.com/u/monivenus)\ **Post date:** [March 11, 2010, 11:06pm UTC](https://community.cartalk.com/t/break-system-air-conditioning/45942/1 "2010-03-11T23:06:33Z")
I’m the proud owner of a Chevy Lumina Sedan 1997. I?m from Tampico, Tamaulipas, Mexico My Question is why every time I turn off my air conditioner like 4 or 5 minutes later my breaks starts to fail??? Everybody tells me that I?m crazy that one thing has nothing to do with the other, but even when I am in a red light with pressing the break and I turn off my air conditioner I feel like my foot go further. And when I?m trying to break I have to put more effort than usual to break and it takes more distance to do it. Then I stop and it feels like I trying to taming a horse it?s like he wants to go and I?m forcing him to stay. With the air conditioner off de pedal returns faster than normal it?s almost like it has a spring right below my foot instead of returning slowly like always does, when I turn on the air conditioner its heaven again? I live in a pretty hot place in Mexico so I don?t mind to have the air conditioner on all the time; my concern is if someday the air conditioner fails?then what??? Please Help Me!!! ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [March 11, 2010, 11:57pm UTC](https://community.cartalk.com/t/break-system-air-conditioning/45942/2 "2010-03-11T23:57:21Z")
4 or 6 cylinder ?? The BRAKES work by vacuum generated by the operating engine. The A/C takes considerable power to operate and can “stagger” a small 4 cylinder engine. The computer tries to speed up the engine to compensate, which effects the vacuum to the brakes. You feel that change. The brake booster has a check valve to maintain constant vacuum. Make sure it’s working. Make sure your engines idle speed is constant, regardless whether the A/C is on or off… ---
**Author:** ![monivenus](https://avatars.discourse-cdn.com/v4/letter/m/b77776/32.png) [@monivenus](https://community.cartalk.com/u/monivenus)\ **Post date:** [March 12, 2010, 12:22am UTC](https://community.cartalk.com/t/break-system-air-conditioning/45942/3 "2010-03-12T00:22:10Z")
it’s 6 cylinder thanks for the answer… ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [March 12, 2010, 3:48am UTC](https://community.cartalk.com/t/break-system-air-conditioning/45942/4 "2010-03-12T03:48:01Z")
I think it’s a problem with the brake booster or check valve. I would get the booster rebuilt or replaced.