Question about 2003 Buick LeSabre

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Car vibrates when braking off the interstate, but not coming off of lower speeds. Is that brakes or shocks or what?

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It could be a variety of things. Usually, a misalignment from wear. It is generally better to go to a trusted mechanic and have them check it out to see if any parts are worn down as it would be hard to say online without looking at it.

Let me know how this works out for you.

Benjamin

Posted on Apr 30, 2010

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When your Cadillac shakes when you start it what usually wrong


  • Knowing the warning signs of impending trouble can go a long way toward keeping your car from a highway breakdown.

    You need to develop an awareness of how your car should sound. For instance, when you turn the key to start, the gear like sound of the starter motor engaging should be smooth and sound like an electric motor working hard to crank the engine. If you notice a different sound - more like a grinding - chances are you have a starter motor problem about to happen. Let's say you're driving along and you feel the steering wheel vibrating at certain speeds. The onset of this subtle vibration could tip you off to a tire that needs to be balanced, worn steering linkage or a bulge in a tire that may be about to blow out. In any case, the vibration needs attention. Normally you shouldn't notice the sound of the exhaust system. A sudden change in your car's sound, therefore, isn't something to ignore.

    Suppose you're used to a pleasant hum, then, perhaps after a bump or when starting up the car one morning, there's a loud roaring that sound like a hot rod without a muffler. The harder you press the gas pedal. The louder the noise becomes. A noisy exhaust means the exhaust gases are blowing out under the car rather than at the rear of the car - a dangerous condition. Brakes play their own warning tune. On many cars, a scratching noise coming from the wheels that stops when you stop pressing on the brake pedal is caused by a low-brake warning device. Its purpose is to warn you that you need front brake pads. A loud grinding noise when you step on the brake pedal is an alarm that your brakes need immediate attention. The grinding noise occurs when the brake pads are totally worn away and the metal of the brake pad backing plate rubs directly on the brake rotor.

    Ignoring grinding brakes can be a costly - or even deadly - error. Shock absorbers help keep the car steady and balanced while the wheels roll over bumps and ruts. Their modern counterpart, the MacPherson strut, does essentially the same thing. You might not notice worn shocks or struts when you're simply riding around town. The safety effect of these devices comes into play at higher speeds. When you hit a bump, the tire wants to bounce like a basketball. Worn shocks or struts allow the ties to bounce out of control making steering difficult and braking less effective.

    What you may notice is the car rocking more every time you stop, assuming an almost boat like quality. Old, broken or worn out shocks and struts should be replaced to ensure safe steering and braking at higher speeds. Engine noises are easiest to hear when the car is not moving. Transmission sounds or brake noises usually occur when the car is moving. Pay attention to any new sound and keep notes - how it sounds, when it makes the sound and what difference, if any, occurs in driving when the noise is present - to help you describe it to your service dealer.

May 22, 2015 | Cadillac Cars & Trucks

1 Answer

My Mitsubishi lancer ex is vibrating during 12okmph. I already did wheel alignment, wheel balancing but still giving me same problem. Please advise what is the solution it is 2011 model with 15,000klm...


I have a Mitsubishi lancer also and I found out after a discussion with the dealer service manager that a similar problem comes from warped front disc rotors. I noticed that there was a slight pulsing of the brake pedal at low speeds but the brakes worked as they should. I went to a brake specialist where I get all my clutch and brake parts and he informed that the genuine rotors are made of inferior metal and warp early in the service life. As they are not covered by warranty I bought after market discs of good quality and the problem went. What I am trying to say is that your low mileage problem is about the same as when mine started. If the disc rotors are warped then at speed the continuous touching of the pads will produce a vibration affect at high speed as at lower speed the vibration will be barely noticeable. Take the car to a reputable brake specialist and have him test the discs as to running true and are not warped.

Sep 30, 2013 | Mitsubishi Lancer Cars & Trucks

4 Answers

Steering wheel shakes at high speed when brakes are applied


This is caused by the front disk brake rotors being warped from heat and running out of true, the wobble of the warped rotors causes the wheel to shake when you apply the brakes, it is worse the higher the speed you apply them at. Have the front rotors machined flat again or just replace them.

Mar 16, 2011 | 1998 Toyota Camry

1 Answer

When you drive between 100-120km/hr the vibration get very bad but when you drive after 120km/hr


If the vibration is related to speed, and goes away at different speeds higher and lower, it is likely to be a wheel balance problem. Have the wheels balanced at a tyre shop. If it is under braking only, the brake discs are warped.

Mar 15, 2011 | Toyota Corolla Cars & Trucks

2 Answers

2003 Nissan Sentra automatic When hard braking at highway speed, get pulsing vibration - tires/alignment/shocks or sturts


Probably your ABS brakes. Thats how they work, they pulsate so as not to lock up and go into a skid

Jun 24, 2010 | 2003 Nissan Sentra

1 Answer

1997 Toyota camry vibrates when i brake hard.


You are on the right track with the struts. With 212,000 miles, it is a great possibility that your shocks are worn out. With extra weight in the car, the shocks are suppose to keep the car from "bottoming out".

The creaking noises can also be caused by this and will be worse in cold weather. Does the creaking seem to go away a bit when you have been driving for a bit? When the gas in the chamber of the shocks warms up it expands and is able to hold the car up better.

Now, for the main problem. Usually vibration when braking is cause by warped or damaged rotors. The damaged rotors have probably caused the brakes to go bad as well. You can have a mechanic look at the rotors to see if they can be turned which will give them a flat surface. They may have to be replaced. Other causes could be the tie rod wearing out or wheel bearings wearing out. If the only time the car vibrates is when you brake, then more than likely it is your rotors. The ABS sensor is located very close to these components. It is likely that it is a faulty code and can be erased. The sensor may have been damage due to the excessive vibration. I recommend finding a mechanic very soon to look at your rotors.

Feb 15, 2010 | 1997 Honda Accord

1 Answer

When the truck gets up to 60-65 mph it shakes real bad. and then when i hit the brakes the rear of the truck acts like it is bouncing. just replaced the front brake rotars last week and had tires checked...


do you feel any vibration when braking at lower speeds like 30? if any vibrations happen only when braking, fix those first. I suspect there is a rear brake problem. also verify that the driveshaft and universal joints are good.

Oct 17, 2009 | 2007 Chevrolet Silverado 2500HD

1 Answer

I need the rear shock torque specs for a 2007 sport trac


Torque Specifications Description Nm lb-ft lb-in Brake caliper bolt 32 24 — Brake disc shield bolt 8 — 71 Fuel tank filler pipe bracket bolt 15 11 — Fuel tank filler pipe hose clamps 3 — 27 Halfshaft nut and washer 275 203 — Lower arm inboard bolt 250 185 — Lower arm outboard bolt 275 203 — Parking brake cable bracket bolt 10 — 89 Shock absorber lower bolt 275 203 — Shock absorber rod nut 65 48 — Shock absorber upper mount nut 30 22 — Stabilizer bar bracket nut 48 35 — Stabilizer bar link nut and grommet 30 22 — Toe link cam adjuster nut 275 203 — Toe link outboard bolt 325 240 — Trailing arm bolt 300 222 — Upper arm outboard bolt 225 166 — Upper arm inboard nut 250 185 — Wheel speed sensor bolt 8 — 71 Wheel knuckle bolt 275 203 —

Mar 30, 2009 | 2007 Ford Sport Trac Limited

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