MOT Brakes

image: car brakes

Brakes

Everyone knows that brakes are an essential component of every vehicle and every driver uses the braking system countless times on every journey, brakes should not be taken for granted.

The brake pedal must have an anti-slip pad either made of rubber which clips over the smooth metal lever or a course cut metal cover supplying the grip to the surface. This needs to be secure to the lever and not worn smooth. If the rubber pad has worn out or missing you can use the one off the clutch pedal as this is not part of the test, for the clutch pedal a piece of sandpaper and super glue will be fine. Repairs to the brake pedal are not advised.

High level brake lights are an additional stop light, additional stop lamps fitted and connected must be tested. Where extra lamps are fitted and there is doubt as to whether they are connected, the benefit of this doubt should be given to the presenter. If the wires have been obviously cut and as long as the two side brake lights are working then this will be just an advisory and a pass certificate will be issued.

How do brakes stop a car?

When you step on your brake pedal, the leverage created pushes a small piston inside the master cylinder. This master cylinder is filled with brake fluid and the action of the moving piston inside the cylinder pumps the brake fluid through small pipes and hoses to the wheel area. At each wheel area other small pistons are pushed outwards and force friction material called brake linings against a moving part, the brake disc. This process is called hydraulic action and works in the same way that brake blocks clamp against the rim of a bicycle wheel when you operate the brake lever.

ABS (anti-locking braking system)

Abs is a system that provides near optimum braking under most road conditions, on wet or icy roads. Abs virtually eliminated the tendency of wheels to lock up when braking and helps to

  • Ensure braking efficiency is used to the maximum
  • Achieve shorter stopping distances
  • Control direction when braking on corners

However drivers must still be aware of the prevailing road conditions and drive in a responsible manner.

Abs light stays on indicates an ABS fault which will require diagnostic testing to find the problem. Usually a sensor attached to one of the wheels is at fault and this will need to be rectified. Sometimes cleaning the sensor and the hub ring which the sensor makes contact with can solve the problem.

Brakes are not checked for condition, only an efficiency test is carried out. The wheels are not removed for the MOT test. If alloy wheels are fitted and the tester can see the brake pads through the wheels and they are below 1.5mm then this shall be reason for a fail. Brake disc will fail if any signs of cracks or covered in oil or brake fluid.

Just because your vehicle passes the MOT it does not mean that your brakes are in good condition.


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