We just discovered the body shop forgot to replace the brake fluid cap on our 2015 Prius III when they completed recent collision repairs. They returned the car to us around October 20. We are in the SF Bay Area where the Fall temps have ranged from 35 to 65, with a fair amount of rain. We're concerned water vapor has entered the brake fluid under these conditions. Insurance is guaranteeing the shop's work as they are in a contract. We are thinking of having the shop do a brake fluid flush. Any thoughts or recommendations on alternative or supplemental work we should look into? Thanks in advance.
Yes, either make them flush it or do it yourself and make sure it’s done right. I haven’t done a brake flush for a while but I think you have to put it in “invalid mode” or similar to flush the brakes, and the body shop won’t know this. Maybe if you tell them the procedure, they’ll do it right, or maybe they’re just a bunch of boneheads who can’t follow simple instructions. I’d say 50-50, which is why I do my own car work.
I'd try to get them to agree to pay for a dealership brake fluid change. Shouldn't be much over $100. Prius brake fluid change is not hard, but it IS tricky. If they in fact lost the cap, why would that make them good candidates for a brake fluid replacement, one that requires invalid mode and knowhow?? Why the hell would they be taking the cap off anyway?? Are you sure it was them?
Since there’s not enough info about the collision repair, what if the car was rear ended and the cap fell off and they only repaired the back and was never required to open the hood for any engine work. How are they liable for the no cap?
I wonder if somebody could do a back-of-the-envelope on the g force involved if the brake reservoir cap "fell off"....
A proper brake fluid change IS a flush. Any place that asks you to pay extra for a "flush" should be avoided. Same thing applies for coolant change too.
It's still iffy that it was the the body shop did that. Maybe just fugedaboutit, but do a brake fluid change. The cap is not air tight too, makes you wonder what the difference would be. Luckily didn't spill, or did some? On our 2010 the cap has a bayonet mount, no way it would fling off. Watching @NutzAboutBolts doing brake fluid change on his 2012, looks like it pries off? Probably still very secure. My hunch: the body shop never touched the cap. I DIY'd the brake fluid change a few weeks back (second time), cost me about $15 CDN for 2 pints of of Toyota DOT3. Maybe watch the @NutzAboutBolts a few times, DIY? You could actually do it with the car on the ground, no wheels removed, but it's easier raised and wheels off. My wife helped, pushing the brake.