Planning to diy the brake fluid, is it the same as the gen3 so can i follow the same procedure or is there something different about the gen4? Planning to disconnect the 12v battery fill the reservoir and keep it filled, open the nipple on each of the wheels and wait for it to drain, any precautions you might recommend? Many thanks.
Not sure why you'd disconnect the 12 volt. In your shoes, I'd follow the non-Techstream method, putting the car in "invalid mode", as described in the attached. Watch the @NutzAboutBolts video too, it's third gen but very similar. Links here: Nutz About Bolts Prius Maintenance Videos | PriusChat If I'm not mistaken, 4th gen sequence is sim to 3rd gen (and contrary to video): F/R, F/L, R/L and R/R. See also "brake fluid replacement" link in my signature. It's third gen, but as some relevant tips.
Yeah the non-Techstream order is thus: indicated in steps 1, 6, 7 and 12 in the attachment. The way it’s described couldn’t be more obscure.
I need to follow this...my wife's 2017 brake fluid needs to be replaced. I do have a scan tool (XTool D7) so I'll have to research if it can do the same functions as the Techstream. Nicoj: I got one of those MityVacs years ago and it worked great the first 3-4 times. Then it started falling apart so I got another brand. Last time I used the "new" one, I got so frustrated with it NOT working I had to grab the old MityVac out and used it....for some reason the little sucker works! (Pun intended!)
I got one from harborfreight and it was better than my mityvac one. My mityvac's handle broke when i used it one time because it was plastic, the harborfreight is metal and a lot more sturdier, the pump is smooth as well. For the fraction of the price.
I found vacuum not needed, doing brake fluid on our ‘10 Prius. More info in my signature (on a phone turn it landscape to see signature). I got a mighty vac years back; the only component I’ve ever used is the bleed screw attachment. The one on mine is metal, has a hinge pin that keeps popping out. Useless.
Have y'all heard about the Phoenix Systems coolant and brake fluid test strips? They test brake fluid for corrosion level (ppm) and the coolant for both freeze point glycol % and pH Corrosion/Acidity levels. I just tested by Tundra and the test strips are spot on...I just drained the brake fluid and it tested near the 0% (best) and I did a drain/fill with the coolant a few months ago so was wondering if I needed to do it, again, since I know I didn't get it all switched out. Nope, it's saying coolant is between 60-100% (Freeze point) and pH is at 11, the highest (best). According to the test, you replace coolant when freeze point is at 33% or lower and pH is at 6.5 or lower. I did the same on the 2017 Prius. I just did a complete coolant exchange so, of course, it's on the best indicators and I was surprised with the brake fluid...is only one bar down from the best, 10 ppm. Very surprised...test said don't replace unless ppm is 200 or higher. Maybe because the car is parked in a garage and I've never opened the fluid reservoir? (Until now!) I guess if it ain't broke, don't fix it...so I'll retest in 6-months after the hot summer months. The test strips have a test on each end of one so you just test both whether you need to or not. I've heard some mechanics use them because it shows the customer when they are bad...pretty smart.
You mean this strips. Phoenix Systems 8006-B Double-Ended Brake Fluid + Coolant Test Strips (15 foil wrapped test strips), 1 Pack https://a.co/d/aXYGGVA Yes, they work well.
