hypervish

Hey everyone, hope everyone is doing well and happy holidays!

I want to change out my brake fluid sometime next week after my road trip. I don't want to damage the master cylinder as I've heard that's easy to do when bleeding brakes.

Here is the procedure I plan on using, please let me know if it's safe for the master cylinder.

1. Open brake fluid cap.
2. Pump brakes.
3. Open bleeder valve.
4. Close valve.
5. Pump brakes again.
6. Open bleeder valve.
7. Close valve.
8. And, continue that till the fluid is clean and I've done all 4 calipers.
9. Finally, close the brake fluid cap. ( I will monitor brake fluid and add as needed throughout the whole procedure)

carguy07

I think the trick to protecting the master cylinder is to put a block of wood under the brake pedal to keep it from being depressed further than it normally can go down.

Honda warns about it too.

FilPilot

hypervish

I use a Pneumatic Oil Extractor, park the car on a level surface and evac all the brake fluid, then fill it with fresh. Done this when I bought the car (used) and again 6 months later, seems to work for me. Also do the power steering fluid.

hypervish

Ok, I'll find a piece of wood to keep under the brake pedal. Thanks for the PDF, that picture makes a lot of sense!

hypervish

An oil extractor will not work with brake fluid, because the fluid in the reservoir does not circulate such as with the power steering. At most the brake fluid may make it half way down the line if the brake pads are going low and the piston is coming out further from the caliper.

However it is a good idea to put new fluid in the reservoir and then do the brake bleeding.