propflux01
2024 CX5 Signature
Does the system have to be in service mode just to exchange the Brake Fluid?
Brake Fluid Exchange
- Thread starter propflux01
- Start date
HyFlyer
2019 CX5 sig 2.2 diesel / 2016.5 CX5 touring 2.5na
- :
- Southwest Ohio
I'm no expert on this 
but just thinking logically, if the rear brakes were not in service mode, then the rear caliper pistons would be full of "old" fluid that wouldn't get flushed or exchanged. Same with the front caliper pistons ... I would think you would want all four caliper pistons compressed when you do a brake fluid exchange to get the maximum amount of old fluid out.
So, not only in service mode but also compress all the brake caliper pistons.
If you're not interested in doing all of that, flushing out the system without compressing the pistons would still be better than nothing.
but just thinking logically, if the rear brakes were not in service mode, then the rear caliper pistons would be full of "old" fluid that wouldn't get flushed or exchanged. Same with the front caliper pistons ... I would think you would want all four caliper pistons compressed when you do a brake fluid exchange to get the maximum amount of old fluid out.So, not only in service mode but also compress all the brake caliper pistons.
If you're not interested in doing all of that, flushing out the system without compressing the pistons would still be better than nothing.
Similar Threads and Articles
