Question about 2000 Buick LeSabre

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Brakes do not work on startup

Once every 6 months or so (usually in cold weather) the brakes don't function on startup. the brake pedal will be depressed to shift into gear (forward or reverse) but as soon as the car is in gear it will just shoot away. while the car is shooting away the brake pedal remains mushed on the floorboard.

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Try Pumping the Brake Pedal when it does this BEFORE you shift into Rev, or Drive.

Posted on Jan 10, 2009

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Brakes do not work in cold weather. brakes pedal will go right to the floor with out slowing down. i have to pump the brakes several times to slow down. i have had car in dealership for the past 5


Man, you've spent some money without isolating the problem. Throwing parts at a problem is never a way forward. The brakes not working when its cold? When you pump the brakes does the pedal become hard/normal in cold weather or at any time? What happens if you plug the booster hose and start up, is the pedal hard instantly? You say there is engine oil in the booster? how much? What mileage has it done and is the engine in good condition ie serviced? I know this sounds silly but you haven't really got to what the dealer is supposed to have done for your money. I find it difficult to believe there is no experienced tech who couldn't work this out. He should do things like clamp off the flexi lines to each wheel in turn and then in pairs then all together etc with proper brake hose clamps to see if that makes a difference. He should be leaving it out in the cold and seeing for himself what happens.
Did the shop go through this sort of process? Careful checks and process of elimination is what gets to the bottom of these faults.

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2007 Silverado 2500hd cruise control stops working when the weather gets cold. Could you tell me what is causing this problem.


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1 Answer

Horrible squeaking brakes 2008 chevy malibu ls


I have done brake work for 50 years & never had one problem

So whomever is doing your work isn't doing what is necessary

If all rust is removed from all mating surfaces,& all sliding surfaces
& anti-seize is applied to those areas, you won't have any problems

Silicone Brake Lube to the caliper pins

You have to machine the rotors properly & you have to use quality
pads-Raybestos or Wagner & their best,most expensive ones

Once a year min you start over & repeat the rust removal & lube
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Brake Fluid-- HAS TO (MUST BE) Replaced/Flushed every 2 years

Parking Brake Cables can not be rusted inside & hung up

I'm 100% sure they never removed any rust,never lubed a thing,
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That is what the butchers at all shops do

When a vehicle is built, it comes off the assy line bone dry
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Are you sure the main brake lights are not coming on too? The work off the same switch. It sounds like your brake switch needs to be readjusted or replaced

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What is the sympton for bad break booster.i am confused--will the brake pedal be hard to push down or way to easy to push to floor. i have hissing sound in warm weather near brake pedal but not in cold...


Hello rickyjkoch: My name is Roger and I will help with your question. With the engine off, press the brake pedal down several times. Hold the pedal down and start the engine. The brake pedal should drop 1 1/2 to 2 1/2 inches toward the floor. If the pedal stays up and does not drop the booster has a problem. However if you hear a hissing sound from the dash area of the brake pedal the booster should be replaced. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

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That's the most interesting problem I've heard all week. I'm pretty sure this has to be problem in the switch that operates the light. Are you positive it's the brake light and not just the tail light? Tail light switch is part of the headlight switch. If you're sure it's the brake light, replace the switch under the brake pedal arm, under your dash. I think this is the problem because unless the circuit is engaged at these switches, it's impossible to activate them from anywhere else. Brake switch is easy. You can do it your self. Headlight switch usually involves removing the steering wheel and is kind of a pain but not too overwhelming.

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perhaps brake booster usually they get hard as rock to brake when they go! however with out actually seeing your car this would be the ideal place to start!

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