Car brakes: how to detect faults and malfunctions

Brake failure car: its most frequent breakdownsBrake failure car: its most frequent breakdownsBrake failure car: its most frequent breakdownsBrake failure car: its most frequent breakdowns

With tires and shock absorbers, brakes make up the "triangle of active safety"; three elements that work together and in good condition, will avoid an accident. At other times we talked about faults and failures that may occur in the first two; but, Would you know to identify the most common defects that may appear on the brakes and how to fix them? This guide can help you.

1. The brake pedal has a very long journey

It may be due to leakage in the hydraulic circuit or the presence of air therein. In the first case, we should revise and replace the area in which the loss is occurring; in the second, sufficient to perform purging and filling system.

Also it is using a Brake control fluid or does not reach the minimum level. In the first situation it will be necessary, pre-rinse the system with methyl alcohol, which proposes to replace the vehicle manufacturer's brand; in the second, fill, although it may also be appropriate to proceed just as if you had previously purge air.

This symptom may also be caused by a very worn pads and the solution, as is obvious, always passes through replacement.

2. The brake pedal feels spongy without firmness

The ruling can be operated from the air in the circuit or inadequate brake fluid; so it should come as explained previously: purging and filling, even in the second case, by washing.

As well a piston of one of the jaws or calipers of the brake can seize or get dirty, producing that perception. If the fault is there we should proceed to clean and replace the seals and dust.

A catchphrase in poor condition, but lossless, can produce such an impression, like a gripada clamp. In both cases, the solution will pass replace the corresponding part.

Brake failure Car3. You have to step on the pedal too hard to stop

There are many reasons that can cause this feeling. For example, the tablets do not bite the disks because they are greased or crystallized, in which case it should be found because that lubrication occurs, fix and replace the pads; or why the piston of a clamp is galling, which would replace seals, dust, etc. Costliest may be that the master cylinder is seized, in which case it would be replaced; or if disks are damaged, in which case it needed replacing too. It can be a servofreno problem, which requires a thorough review. It could even be due to a simple breakdown: that the pedal does not run smoothly, in which case it should be lubricated.

4. The brake pedal stroke is reduced significantly

It is customary that the failure to focus on the master cylinder, either because their gums have lost elasticity or because the piston does not recover its original place. In both cases it will have to replace the damaged parts. It may also be because the springs that make the piston returns to its normal position not function properly or the caliper piston from sticking, in which case it should be clean, lubricate and replace the seal.

5. One of the wheels lock braking

It may be due to a blockage in the Hydraulic fluid conduits which requires replacement, the same solution applies if the problems are on the pistons, seals...

Also a defective pill It could cause the blockade which logically should be replaced; or that the handbrake cable snaps, in which case it should be lubricated and verify its operation.

6. When braking noticeable vibrations on the pedal

Some warped discs, the wheel bearings bad or problems with the material forming the disks, so that some areas are transformed with heat or machining defects, they can give rise to pulsations in the brake pedal. The solution in all cases is to replace the element that causes the damage.

Car brakes: Trouble-shooting7. hot brakes lose their effectiveness

A sleazy bar or makes poor contact with the disk brake, even it is already very thin, causing that feeling. Replacement of the affected component is essential in all cases.

8. When braking in a straight line, the car moves laterally

This symptom can be caused by many elements, including some that have no relation to the brakes, such as a dampers in poor condition, an address slack or pneumatic with inadequate pressures, uneven wear, or taxiways different band. However, the brakes may also have such an effect, for example, if the a wheel pads are greased, Crystallized or loose; cases where it would be replaced. Also one of the cylinders gag It could be blocked, which would require replacement; or disk may be in poor condition. Even one of the circuit piping may be deformed. It is probably the most difficult symptom of failure to solve the multitude of causes that may be due.

9. The brakes vibrate

Dirty pads, a broken spring, spherical plain bearings or in poor condition cause these vibrations and demand the change of the affected part. Also a unbalanced wheel It may be the cause of the vibration or a warped discs, in which case it should be replaced.

10. The brakes squeal

Again may be multiple causes that cause this noise. A antinoise sheet displaced, bent or broken can be the source and, if so, we should replace the pads the entire shaft. It would also be necessary if tablets have as dust or metallic particles; even if they are of low quality. Yes rozasen against the caliper or gag It should be lubricate this contact point to prevent chirp, just as the piston might not move smoothly, in which case would be repaired, or has broken springs. Some disks in poor or very worn pads, You can also squeak.