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6 brake problems that could spell danger on the roads

Kwik Fit | Tuesday 27th November 2018 11:45am

Brake drum

As a result of the vital role they play in keeping you safe on the roads, itís really important that you know your stuff when it comes to your carís brakes. This means being aware of the warning signs that somethingís wrong with this crucial safety system - and knowing what to do when you spot a problem.

To help ensure youíre up to speed on this subject, here are seven brake issues that can spell danger on the roads.

1. Wear

Brake discs are designed and manufactured to be robust, but they do wear down over time and, if they experience too much wear, they can become unsafe. Each time you press the brake pedal, load is transferred to the front wheels of your vehicle - and the front brakes do the majority of the work to slow you down or bring you to a stop. Because of this, itís normal to have to replace your front discs and pads during the life of your car.

Vehicle makers specify a minimum thickness for discs, and once they reach this point, you have to get them replaced - along with the pads. This must be done in pairs; you canít replace one set and leave the other as it is.

2. Corrosion

While front brakes are more likely to need replacing due to wear, their counterparts at the rear of your car are most likely to need renewing as a result of corrosion. Brake discs are made from cast iron. Although this material has many beneficial qualities, one drawback associated with it is the fact that it rusts easily. As rust begins to develop on the surface of discs, it is cleaned off by the action of the pads pressing on them. However, because rear brakes do very little work, the rust on them isnít cleaned away as effectively as it is on the front sets. Itís therefore common for these discs to corrode, particularly on small and light vehicles or ones that are used infrequently and for short journeys.

As corrosion gets worse, it can lead to surface pitting. Although pitting in itself isnít an automatic cause of MOT failure anymore, if discs are deemed to be Ďseriously weakenedí because of pitting, they are seen as dangerous and wonít pass this test. So, if these parts of your braking system corrode too much, youíll need to get them replaced.

3. Water in brake fluid

Regardless of the number of miles you clock up behind the wheel, over time the brake fluid in your car will absorb water from the atmosphere. If your brakes get hot, they can cause this moisture to boil and evaporate. Unlike a liquid, this vapour can compress, meaning your brakes may feel Ďspongyí when you press the pedal and might you lose the ability to stop or slow down effectively. In addition, moisture contained within brake fluid can lead to the corrosion of the brake calipers or wheel cylinders and eventually result in a leak. Either of these scenarios can prove to be extremely dangerous.  Given these potentially serious problems, itís recommended that you get the brake fluid in your vehicle replaced every couple of years.

4. Distortion

If you feel a juddering sensation through the pedal when you slow down, it may be that your brake disc has become distorted. This sometimes happens as a result of uneven heating and cooling, and thin or worn discs are more susceptible to the problem. Distorted discs perform less well, so itís wise to visit a specialist technician if you think your car may have this problem.

To avoid getting it in the first place, try not to slow your car down using the brakes for long downhill stretches as this causes the discs to become very hot. Instead, itís better to limit your speed on downhills by moving into a lower gear.

5. Squeal

Squealing brakes can be annoying, and theyíre an indication that somethingís not right. This noise is caused by a build-up of brake dust. Thankfully, itís not as common as it used to be because of design improvements made over recent years. However, it can still occur. One way to tackle this problem is to apply a special grease to the back of the pads. Bear in mind that this grease must be compatible with the rubber dust seals that are used in the caliper. If your brakes start squealing, you can visit a technician for advice.

6. Scoring

When brake pads arenít replaced in time and they wear down too much, their metal backing can start to come into contact with the disc. In turn, this leads to scoring and can seriously reduce your ability to slow down and stop. As well as increasing your risk of accidents, this can result in a more costly repair. If you ignore the early symptoms of scoring, itís likely youíll need to replace your discs too as a result of the damage done to them.

The first sign of this problem is an unpleasant metallic noise when you press the brake pedal. If you notice this, make sure you take your car to a specialist as soon as possible.

Having your car serviced regularly should help you to avoid any issues with your brakes, keeping you safe and giving you extra peace of mind. Meanwhile, if you do spot any warning signs or you have any questions about your vehicleís braking system, donít hesitate to contact our experts. You can book a free visual check or full inspection online that will determine whether any action needs to be taken.


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