Sealey brake tools sealey vs058 this brake pad thickness gauge from sealey is an ingenious time saving tool essential for any garage measures the brake pad lining on the vehicle without removing the road wheel slim design enables the tool to locate the rear of the pad backing plate allowing the probe to measure the distance between the underside of the backing plate and brake disc suitable for both internal and external brake pads and features a 15mm and calibration check marking design