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check tyres for balance and high spots in the side walls and tread. Have a wheel alignment to correct castor problems . check front end for serviceability. Check brake pads for grabbing and not free of disc rotors. Check the disc rotors for warp and run out . Check front wheel bearings for condition and tension.
Front end vibration has little to do with the brake system on the car. Yes you can get some "brake shudder" when you apply the brakes when you have worn brake rotors or when the rotors are not properly aligned on the hubs. However from what you have said you do not have this problem.
Front end vibrations can be caused by a number of factors some of which are listed below:
1. Front wheels out of balance. (Common problem on many vehicles).
When were the front wheels last balanced? You will get vibrations through the car and the steering wheel at particular speeds. This will/could also occur if the wheel rims have been distorted as a result of abuse.
As a first step the wheels should be balanced and then retest the vehicle for the problem.
It can be impossible to properly balance some wheels because the tires fitted to the rims are of poor quality and contain heavy spots that are impossible to correct with wheel balance weights. If you have cheap tires fitted on the wheel rims then it may be impossible to balance the wheels properly because of the imperfections in the tyre. In that case you will have a permanent wheel vibration problem which will only be rectified by fitting good quality tires and re-balancing the front wheels.
If aftermarket wheel rims have been fitted to the vehicle this can also be a source of vibration. Some wheels on the market are poor quality and can be slightly out of round and/or have heavy spots in them which can be impossible to correct when you fit the tires and have the wheels balanced. Many people think a cheap set of "blingy" aftermarket wheels are a great buy but if they are poorly built (as is often the case) you will usually have no end of problems.
2. The front wheel alignment could be out. If the front wheels have not been aligned in the past 12 months they probably will be out of alignment. When you have re-balanced the front wheels you should have the front wheel alignment checked and then re-aligned if it is out. However if their are worn suspension components (see 4) found on the car which need to be replaced, this repair needs to be done before the front wheels are re-aligned.
3. Worn out wheel bearings in the front hubs. If your front wheel bearings are badly worn you can get a vibration through the steering wheel. If the vehicle has done about 100000 miles or more on the front wheel bearings they should be replaced. In any event , any competent mechanic can jack up the front of the car and check for excess play in the wheel bearings.
4. Worn out suspension components. The front end of the car should be checked for badly worn suspension and steering components.
I would recommend you take the vehicle to a competent mechanic or a suspension specialist in your area and have them check the vehicle for you.
I really need much more information about what has been done or not done to the car but I will go with what you have said.
1. I assume the wheel alignment has been done and is fine and I also assume that the front suspension and steering components are all in acceptable condition.
2. Have the front wheels re-balanced at a competent shop (and at the same time check for any distortion or damage to the front wheel rims). Many vibration problems that kick in in the front end at a specific speed are often due to poor balancing or a tyre/wheel combination that is impossible to balance properly because of defects in the product.
3. If the problem is unchanged have the wheel bearings checked and replaced especially if you have no record of when this was done previously. This is a 2002 car and has presumably done around 80000 miles or more.
4. If you have a cheap brand of tire on the vehicle there could be a heavy spot in the tire which could make it impossible to properly balance. If you have just replaced the tires and did not have the vibration problem with the old tires then I would suspect the new tires are the problem if everything else is OK. Buying lower priced tires is never a good move as poor build quality is just one of many problems with such products. Ultimately it is just wasted money.
Also bear in mind that a badly built (but undamaged) alloy wheel will also be impossible to balance properly and these sometimes slip through quality control.
From what you have described the disc rotors on the vehicle are distorted and could be fairly badly distorted if they have been subjected to excessive temperatures at any time.
This will translate into a pulsation in the brake pedal - especially noticeable when you brake at speeds above about 40mph. At 60 mph - as you found - you cannot miss it. At higher speeds you will also get some vibration through the steering wheel once you brake.
The disc rotors will need to be examined and removed from the car for machining or total replacement. They may be too worn or distorted for machining as the manufacturers specify a minimum safe disc rotor thickness. Disc rotors don't last the life of the car and replacing them is a fairly routine exercise and not usually expensive except on many European cars and on many prestige brands. The brake pads should also be replaced at the same time unless replaced recently and have minimal wear. The operation of the brake calipers should also be checked.
If you had a wheel balance problem on the car (rectified with a decent re-balance of both front wheels) you would find a constant vibration through the steering wheel at a given speed usually above about 45mph. What you have complained of is vibration only upon braking plus a pulsation through the brake pedal whilst braking. However if you are also noticing a constant vibration through the steering wheel at or above a given speed when cruising you need to have the front wheels re-balanced and the front suspension and steering checked for problems. If you have uneven tyre wear you will also need to have the front wheels re-aligned. If a front wheel alignment was not done on the car in the last 12000 miles it will need a wheel alignment in any event.
I would check your front tires for any defects if there is none noticeable I would get a front end alignment. Most of the time you can tell if you need a alignment if your car pulls to either the right or left while driving. Hope this helps.
that sounds like the pressure regulator of your brakes is broken. The pressure does not release from the left side.
Unless it is the calliper, but i think you already checked that out. Pressure regulator is the main cause for problems like this.
It regulates pressure between back and front side