4PCS Brake Proportioning Valve Bleeder Tool, Aluminum Body, PV2 & PV4 Compati…

Application: Suitable for DISC DRUM PV2 and PV4 AC 172-1371, etc. [Function] : The proportioning valve brake tool is specially designed for brake system exhaust, which can easily lock the low pressure exhaust valve to achieve fast and efficient brake system exhaust, prevent the combination valve from tripping, and ensure the stability and safety of the brake system.