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CR-V::General Opinions, Commentaries and Observations Voice your CR-V thoughts here that do not specifically belong in the other topics.

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Old 10-23-2010, 03:10 PM
Carbuff2 Carbuff2 is offline
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Default Why we should use Honda brake fluid

This article was in the paper the other day:

http://www.nj.com/newsflash/index.ss...3927f183dcd3ad

While the article is about Toyota, it also mentions that Honda had the same type of issues from leaking seals...caused by aftermarket brake fluid.

Quote:
Most of the vehicles covered by Thursday's recall have a problem with seals in the brake master cylinder, which pushes fluid through tubes to force the brakes to stop the car.
Some drivers or their mechanics have put in the wrong type of brake fluid, causing some of the seals to curl up and allowing a small amount of brake fluid to leak, Toyota said.
If the leaks are left unattended, they can cause a spongy feeling in the brake pedal and eventually brake performance problems, the company said.
Quote:
Honda Motor Co. also said it would recall an undetermined number of vehicles because of the same brake issue.
Here's the Honda recall notice:
Quote:
10/22/2010 - TORRANCE, Calif.


American Honda Motor Co., Inc., today announced a voluntary safety recall of 471,820 model year 2005 to 2007 Acura RL and model year 2005 to early 2007 Honda Odyssey vehicles to replace a seal in the brake master cylinder.


Honda made this decision to prevent the unlikely failure of a seal in the brake master cylinder. It is possible for the seal to fail if the Honda Genuine DOT 3 brake fluid installed at the factory is replaced with certain aftermarket brake fluids with reduced lubrication properties, followed by a manual brake bleed with full and rapid stroke of the brake pedal. This could cause the seal to become twisted within its retention groove. The twisted seal could then leak a small amount of brake fluid when the vehicle is used. A brake fluid leak due to this would cause the low brake fluid warning lamp to illuminate until repaired. Failure to repair the master cylinder seal would eventually result in a soft brake pedal and the possible loss of one of the two hydraulic braking circuits.


Drivers of affected vehicles should be aware that this condition will always cause the low brake fluid light to illuminate. If any of the vehicle's malfunction indicators are illuminated, owners should take their vehicle to a dealer for repair immediately.

American Honda will begin to notify owners of affected vehicles within the next two months. Acura and Honda dealers will repair affected vehicles free of charge using a revised design of the brake master cylinder seal.
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Old 10-23-2010, 07:15 PM
06whtcrv 06whtcrv is offline
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Quote:
Originally Posted by Carbuff2 View Post
This article was in the paper the other day:

http://www.nj.com/newsflash/index.ss...3927f183dcd3ad

Quote:
Some drivers or their mechanics have put in the wrong type of brake fluid,
While the article is about Toyota, it also mentions that Honda had the same type of issues from leaking seals...caused by aftermarket brake fluid.

Here's the Honda recall notice:
Not very specific as to what "wrong type" of brake fluid was used... DOT 3 mixed with DOT 5? Prestone mixed with Castrol? How do we identify the wrong type?
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  #3  
Old 10-23-2010, 08:57 PM
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I saw the recall in the USA Today. There was mention of some polymers in Honda and Toyota brake fluids that supposedly prevent the seals in question from leaking and act as a lubricant. The polymers are supposed to prevent the seals from drying out according to the article.
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Old 10-24-2010, 04:18 AM
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Quote:
Originally Posted by sgtsandman View Post
There was mention of some polymers in Honda and Toyota brake fluids that supposedly prevent the seals in question from leaking and act as a lubricant. The polymers are supposed to prevent the seals from drying out according to the article.
Yes, that was my understanding, as well. It's the lubricating polymers that the seals need that SOME aftermarket fluids don't provide. If you don't have them, the seals can leak.



++++++++++++++++++

Another concern (for me) is the caution about bleeding brakes with a "quick jab" (rapid stroke) of the pedal.

When manually bleeding brakes, one or two rapid strokes serve to drive air bubbles out of the system. It has been an accepted method of bleeding brakes for decades. (The rest of the strokes should be slow and deliberate...I tell my helpers to count to five before the pedal stops.)

The other thing mentioned in the Honda recall notice was a "full stroke" of the brake pedal when bleeding. Best practice has always been to prevent bottoming of the brake cylinder when bleeding...a piece of wood on the floorboard prevents any problems like this, as the pedal cannot go all the way to the bottom of the cylinder. So that is nothing new.

+++++++++++++++

Interesting that the manufacturers are warranting against improper practices by independent mechanics.
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Old 10-24-2010, 01:58 PM
06whtcrv 06whtcrv is offline
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Quote:
Originally Posted by Carbuff2 View Post
Interesting that the manufacturers are warranting against improper practices by independent mechanics.
I thought that was interesting too... but it seems more like they are realizing they cannot modify the basic brake fluid (for better lubrication) and then not make it known that the off the shelf fluids are not compatable. Only impacts specific models... interesting that it is not across all model lines. Must be something specific to the master cylinder on the models impacted.
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Old 11-03-2010, 09:30 AM
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hmmm, interesting. I stopped using Honda brake fluid in 2008, when the car was no longer under warranty. I have been using Adavance Auto's in house brake fluid.

Maybe I should switch back....

Let's see if I get a recall notice in the mail...
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Old 11-03-2010, 10:30 AM
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I've been doing the same myself. Never had a problem with the 2001 because of it.
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Old 11-03-2010, 11:08 AM
N_Jay N_Jay is offline
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Found an interesting thing about brake fluid as I am learning about Mercedes.
They have a viscosity specification since the fluid must be of a lower viscosity than standard brake fluid to make sure the ABS and other advanced brake systems can react fast enough.
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Old 11-03-2010, 11:21 AM
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N Jay: Is that synthetic brake fluid?
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Old 11-03-2010, 03:35 PM
N_Jay N_Jay is offline
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Is is Synthetic (as almost all brake fluid is) but it is not silicon.

(How do you define "synthetic"?)
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