While perusing the underside of our Jeep, I noticed a male pneumatic quick-disconnect, tracing the line from it to the firewall of the engine bay. The line entered a Peter Paul Electronics device. From there lines went to the brake master and to a cylinder that might be an accumulator? Does anyone know what this is and what its function might be? At 69yo, this is new to me. Note: The TJ is new to me (2002), and I'm still going through it. Thanks in advance for any tips/advice.
