Yes, the brake fluid should be changed

Pricey Question a Mechanic,

I am a minor puzzled about a letter I gained from the Honda dealership where by I procured my CR-V past year. The car is a 2019, and the letter tells me that I require to provide it again for a brake fluid transform. I have the owned vehicles from distinctive producers for close to 50 decades and have under no circumstances had to transform brake fluid. Is this a thing new? – Fluid flummoxed&#13

I’m betting that if you had been to check the reservoirs of a random sample of a single hundred automobiles at the wrecker’s property, you’d probable obtain considerably less than 10 that did not even now have some of their primary brake fluid still in them. So why is the seller telling you that your CR-V wants its fluid modified? The fact is that brake fluid ought to be changed routinely as a element of typical servicing.&#13

Selected automakers make a stage of encouraging this assistance. Get BMW, which has had this as an item in its services reminder system considering that at the very least the mid-2000s. It is also specified in most newer Hondas. It is product No. 7 in your CR-V’s Upkeep Minder, and it is been involved on the company’s services program for a long time.&#13

Brake fluid is hygroscopic, which implies that it absorbs moisture. It will do so as a result of the cap in the learn cylinder and by way of the seals and hoses in your brake system. This characteristic is why fluid need to be modified periodically. For the automakers that routine a change, it’s ordinarily recommended for each two or a few yrs, regardless of mileage.&#13

There are two motives for this. Initially is the reduction in the boiling point of the brake fluid as it gets to be contaminated by h2o. The DOT 3 fluid that is commonly made use of has a specified minimum “dry” boiling stage of 205-levels Celsius and a bare minimum “wet” boiling stage of 140. Take note the substantial variance dampness saturation helps make.&#13

Less than prolonged tough braking, repetitive prevent-and-go visitors, driving on hilly terrains or when towing, brake temperatures could boil the fluid in the calipers. If that occurs, the result can be everything from a comfortable pedal to an outright deficiency of braking drive.&#13

The other reason – corrosion – is pertinent to all auto house owners. Most brake components are made of aluminum, steel or iron. Internal corrosion can seize pistons and parking brake mechanisms, and it can trigger leaks at seals. Steel and rubber particles also include to the contamination of the fluid. Flushing it all out is rather reasonably priced, prolongs the lifespan of the brakes and maximizes the functionality of this security process.&#13

Ask a Mechanic is created by Brian Early, a Crimson Seal-certified automotive technician. You can send your concerns to [email protected] These answers are for informational needs only. Be sure to consult a accredited mechanic ahead of acquiring any operate finished to your vehicle.

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