Features:

  • Quick and easy way to test for moisture content in the brake fluid; results appear in seconds
  • LED light indicators show percentage of water in the brake fluid
  • Calibrated for cars using DOT 4 brake fluid only (found in most cars produced since 2006)
  • Takes 1 x AAA/1.5V battery (included)
  • Only takes seconds to know the results
Useful product which complements corrosion strips

This meter checks the water content in your brake fluid. Test strips are available to tell you how much corrosion is sensed in the fluid. You should use both, as they complement each other. This meter worked very well, but I had to find a small screwdriver to open the darn battery compartment to put in the battery. Coins, keys, larger screwdrivers, etc. do not suffice (I tried them). Aside from that annoyance, the product told me I had a 1% water content, which is considered okay.

Works well, as far as I can tell.

The ultimate test would really be to start off in some new, clean brake fluid, but I don't have any. However, the brake fluid in my mom's car was tested at a local quick lube place recently and they said the moisture content was at 4%. It's actually the reason I bought this tester, because I don't trust those places, and sure enough I got a reading of 4%. Tested the fluid in my truck and it was bouncing between 1%-2%, which sounds about right since I had the fluid changed less than a year ago. So really, I'd say this device is something that everyone should have. Whether you're a DIY'er who changes their own fluids or you take your vehicle(s) to a shop for someone else to change them and you want to make sure that they're being honest with you, the $20-ish you spend on this tester is a small and necessary investment. Quick tip: When testing, make sure the probes are fully submerged to the point where the brake fluid touches the plastic to get the most accurate reading. When I only submerged the probes halfway in either vehicle, it was reading 1%-2% less.

Great little tool-try a NEW battery!

Great little tool, when it works. The second day I had it it wouldn't turn on until I'd put it in my chest pocket for a couple hours and it warmed up. Next two days that didn't make a difference, it worked when it wanted to. I'm a fleet mechanic, so it needs to work when I need it to, not when it wants to. Maybe it got hammered in shipping, I don't know. I emailed the seller, and while waiting for a response, I'll try and figure out what it takes to make it work. UPDATE: This is going to sound silly, but after removing and installing the battery a few times, noting it would usually work once each time after reinstallation, I put a NEW battery in, and it has worked fine for a few weeks now. So, if yours doesn't work, try a new battery!

Works a little different than the one i am replacing ...

Works a little different than the one i am replacing. My old one you held the button down and got reading, this on you press once and it will give a reading after a second or two, turning off automatically after 12 seconds. Attached is a picture of the back of the package with the directions.

Perfect measurements

I tested by making solutions of DOT4 brake fluid with 0%, 1%, 2%, 3%, and 4% water. After letting the water dissolve for about 8 hours in sealed containers, I checked each. The tester was spot on for all measurements as long as the probes were fully inserted. If only the tips were inserted, all solutions measured <1%. If you want to do a simple test, add 1.5 tsp of water to a 12 fl. oz. bottle of brake fluid. When the water dissolves, the fluid will be 2% water. The tester shows that 2% is OK and 3% should be flushed. My only issue with the tester is the labeling is not compatible with brake fluid. I got a little brake fluid on my thumb, and when I touched tester, the white labeling immediately disappeared.

Quickly Test Your DOT 4 Brake Fluid

Most cars use DOT 3 brake fluid, which is OK for around-town driving -- but if you enjoy mountain driving or other forms of more aggressive motoring -- or you live in a very damp climate, you'll need to get the DOT 4 brake juice. The difference is in the WET BOILING TEMPERATURE -- the DOT 4 juice doesn't absorb moisture as quickly as the DOT 3 stuff, so it boils at a much higher temperature than the DOT 3 stuff -- which means less brake fade and more reliable stopping power. The DOT 4 Brake Fluid Tester was checked against a new (unopened) can of DOT 4 fluid. Tester is easy-to-read and is very accurate. Test showed that my old DOT 4 fluid had picked up some moisture in the last couple of years -- I installed a 4-wheel set of RUSSELL Speed Bleeders (purchased @Amazon) , and pumped out the bad stuff. With new DOT 4 brake fluid installed, braking is more positive. Better pedal feel, quicker stops, no fade with the clean DOT 4 fluid. The tester helped find the trouble and showed the extent of the moisture absorbed in the old fluid. UPDATE: 2/19/I7 -- I saved the old brake fluid in a clean, sealed jar and waited for it to separate. There was A LOT of nasty stuff in the old DOT 4 fluid, just as the Tester had indicated. Excellent product !!

Mine has worked great and reads pretty well

I had reservations about buying this but, saw on youtube where a guy put shrink wrap on the probes and only left about a 1/4" showing. Mine has worked great and reads pretty well. I would advise anyone to look that guy's youtube post and look at it before buying. I noticed a lot of people have had problems but, the shrink wrap made it work great.

This Is A Good Tool For Every Garage

This started when my dealer said “Hey! You need bring in your car for an oil change and to flush the brake fluid.” NOTE: my car is still under warranty, which includes all service; so I brought my car in because it was something I did not have to do myself this time. Anyway, I am also one of those people who does most of the service when I can. I admit, I am kind of old school and never flush the brake fluid out unless it’s dirty or smells bad. With that said, I came across this nifty gadget. Basically, you turn it on and dip the leads into the brake fluid and it immediately provides a break fluid reading. It lets you know the condition of your brake fluid – if it needs to be changed or not. Obviously, this brake fluid tester provides a more accurate reading than looks or smell, and for the $7 you cant beat this tester that simply works. If your one of those people who does not work on your own car and you have to rely upon someone being honest, this is a good idea for you too. It really is simply to use. Like I said, unscrew your brake fluid reservoir (which is under the hood), turn the tester on, and dip it into the fluid; you will have an instant reading and know if you have been provides honest information. Keep in mind that many vehicle manufactures are putting brake fluid on routine maintenance every two years of so.

I really glad I did too

I bought this after seeing one demo'd on YouTube. It was on a motorcycle maintenance vlog, and it was something I hadn't seen before. Seemed to work quite well for the mechanic on the video, so I decided to get one for myself. I really glad I did too. When I first got it, I decided to try it out on my Suburban. Dang! It tapped out immediately to the 4% marker (the highest it goes). Anything over 2% is dangerous! I ended up changing out the brake fluid in it, and went on to check my other vehicles. Seems to work just fine with DOT 3 as well as DOT 4.I have a well equipped shop, and can't believe that I hadn't seen one of these before.

Initial Quality is spot on!

Amazing product. Saved me a lot of time with my three vehicles at home that I do all the maintenance on. I took a brand new bottle of brake fluid and tested for water and the control passed. I then took a car with KNOWN issue with the fluid and tested it--came out as 2% moisture which I expected. I then took a graduated cylinder and added 3% water to the brake fluid and let it sit for a week so it could dissolve properly in the fluid. Once it was fully absorbed (actually took a week +1 day) in a sealed container I tested it again and the fluid tester passed by giving it a 3% reading. In my other two vehicles both fluid changes were performed just 6 months prior and they passed at 1% moisture. When I tested 100% water it obviously gave a 4% DANGER reading. I'm pretty sure this works as designed--I just hope it does so over time or when the battery goes low. I will post another review later.

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