I flush the brake fluid every 2 years on all of mine. I alternate between the ATE Blue and Amber.

With a motive power pressure bleeder it takes less than a half hour per car.

The pressure bleeder was about $100 with adapters for most every car.

I use a 30 inch clear tube slipped over the bleeders to divert the old fluid into a container.

__________________
1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes