In addition to the established time frames, the brakes must be checked every time when the wheels are taken off or in case of any suspicion of a defect. Potential defects in a brake system can be indicated by one of the following symptoms: The vehicle pulls to one side when you press on brake pedal; the brakes make a noise like they are squalling or dragging or there is too much movement of the brake pedal; pulsating pedal; or leakage of brake fluid that often happens inside a tire or wheel. First, loosen your wheel lug nuts and secure your vehicle on jackstands so as to inspect disc brakes. Accessing two pads in every caliper requires that we remove these wheels. Look at each end of the caliper and through inspection window in caliper body to ascertain pad thickness. If lining material is thinner than thickness then replace the pads. In this case, pads should be removed for closer inspection because it is difficult to determine an exact thickness otherwise. Scrub and check them with either ruler or vernier calipers after spraying them with brake cleaner solution. Having some service life still left for it, measure the disc thickness using micrometers. If any single disc falls below minimum prescribed thickness substitute it with another one. Before fixing back tyres check all hoses including brake lines for damage, wear and tear, deformity, cracks, corrosion, leakages, kinks and twists and clamps for stall as well as connections for leaks also making sure that there are no sharp edges touching all pipes including those made from rubber as well as anything which moves inside and outside your vehicle. Sit in driver's seat and perform a series of tests while checking on whether he booster works properly. Lastly before driving away from any dangerous place like hill park the car there applying neutral gear then engage parking brake if its fails roll away you might need adjustment.