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Suspension system: step by step guide to avoid making a mistake in the diagnosis

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Suspension system: step by step guide to avoid making a mistake in the diagnosis

Hello, and Welcome to Racext’s Car Magazine column, the column aimed exclusively at the world of 4-wheeled vehicles with news, insights and guides, available every day here racext.com, today in this article we will talk about “Suspension system: step by step guide to avoid making a mistake in the diagnosis”

Suspension system: step by step guide to avoid making a mistake in the diagnosis

The suspension system is essential for the comfort, safety and stability of the vehicle. For this reason it is one of the most sought after services in mechanical workshops and, therefore, it is necessary to know it thoroughly to perform a good service.

This system consists of a set of parts which includes: springs, shock absorbers, stops, pads, bushings, pins and trays. Therefore, attention is needed to make a good diagnosis and understand what the problem could be.

Below, we’ve compiled some tips that can help you with this type of procedure. Read on to find out more!

How to properly diagnose the suspension system?

To make an accurate diagnosis of the suspension system it is necessary to take some precautions. This is because, as mentioned above, it is composed of several components and, therefore, noise or noise can have different causes.

Below, we have listed some precautions that can help you properly diagnose suspension system problems. Check it out!

# 1 Chat with the customer

When the customer enters the workshop reporting a noise in the suspension, most of the time this defect appeared some time ago and got worse. Therefore, only the owner will know how to convey information with details about what is happening.

# 2 Take the test

Taking the test drive is important to check the suspension system. Therefore, create a course with straights, curves, different types of floors and surfaces and that allows you to test different speeds.

During the test it is important to accompany the customer and inquire about any defects. This is because, during the journey, it will be able to indicate which noises are present in the vehicle.

In this way, the customer will be safer and will know what possible services can be performed in order for the car to be in good condition.

# 3 Evaluate components

Upon returning from the test run, it’s time to evaluate the front and rear suspension components in the lift and the ditch. This is because some defects may not appear when the vehicle is suspended or on the ground. Therefore, the diagnosis will be more accurate.

# 4 Watch for symptoms

To make an accurate diagnosis of the suspension system it is essential to know how to observe the symptoms. Below, we’ll show you how to identify some of them.

Squeak in the front suspension

This type of noise can be caused by friction or friction between the spring and the support plate. When spring compression occurs, it can be checked with the carriage stationary.

To do this, simply press your hands on the front suspension, one side at a time, to compress the spring. That way you can hear the noise. If, by any chance, there is no noise, take a test drive.

This diagnosis can also be analyzed visually, just place the vehicle on a freight elevator and inspect it with the aid of a spatula to check the play.

Front suspension click

In these cases the noise can have multiple sources, so it is important to evaluate in which situations it can be heard. For this, perform a test run and check if the crack appears during acceleration and deceleration.

Then switch to reverse and check the noise. Finally, you can also lift the vehicle and carry out a visual check using a spatula.

Continuous shooting noise on curves

This type of noise is usually caused by damage to the CV joint. To check it is very important to do a road test and see if the noise is continuous when cornering and disappears when traveling in a straight line.

You can also lift the vehicle and examine the CV joint boots. This is because, when it breaks, grease escapes and sand and dirt infiltrate it, which can cause noise. In this case it is necessary to replace the constant velocity joint.

Noise when traveling on uneven floors

These noises appear when traveling over unevenness in the terrain responsible for stability, so they have several possible causes. Therefore, it is necessary to try to reproduce the noise and identify where and on which side of the vehicle it occurs.

For this, analyze the different speeds, in acceleration and deceleration, or lift the vehicle to check the integrity of the main components, such as bushings, cushions and stops with the aid of a spatula.

In these cases it is also important to analyze the useful life of the shock absorber and other factors that determine its efficiency, such as: the conditions of the road surface, the driving conditions, the average weight carried and the condition of the other components of the vehicle suspension.

Abnormal tire wear

If the problem is premature tire wear, it is important to analyze the steering alignment. If it is correct, check the mileage driven with the tire, if it has been rotated to the manufacturer’s specifications and if the tires are original to the DOT standard.

Possible causes include compromising suspension integrity or changing the camber angle. If there is wear on the inner shoulder of the front wheels, the camber angle will be too negative and if it is on the outer shoulder, the angles will be too positive.

Desgaste no internal and external shadow

If wear occurs on the outer and inner shoulders, the problem may be caused by low tire inflation pressure. Therefore, check the current tire pressure and see what pressure the customer usually uses. Furthermore, it is also important to know if the driver is used to cornering frequently at high speed .

Tire wear in the center of the tread

This type of wear can result from aggressive driving or high tire inflation. To diagnose, check the tire pressure and investigate the pressure indicated in the on-board manual.

Sawtooth wear on the entire tread

In these cases, wear can occur when the toe angle is out of specification or due to defective components in the suspension system and steering. For proper diagnosis, check for faulty components and check vehicle alignment.

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Suspension system: step by step guide to avoid making a mistake in the diagnosis

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