Brake Fluid change, without T4, using the "gravity" method

marinabrian · 8th April 2020, 20:09

Just over 40ml, or 1.4 fl oz, remains in old fluid in the Modulator/Pump Assembly and having the engine running doesn't push it out either.

To operate the valves in the modulator, it needs to detect a fault, so by spinning the wheel connected to the circuit you are bleeding with the ignition turned on may be seen as a fault in that circuit on the 600 which if I remember correctly is a WABCO system.

This isn't the case on the R40 where the ABS ECU will see the other three wheels as being static and do nothing

Brian

8th April 2020, 20:09	#19
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Just over 40ml, or 1.4 fl oz, remains in old fluid in the Modulator/Pump Assembly and having the engine running doesn't push it out either. To operate the valves in the modulator, it needs to detect a fault, so by spinning the wheel connected to the circuit you are bleeding with the ignition turned on may be seen as a fault in that circuit on the 600 which if I remember correctly is a WABCO system. This isn't the case on the R40 where the ABS ECU will see the other three wheels as being static and do nothing Brian