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Testing it at the reservoir end is pointless when all the work and degradation occurs at the business end.


Mark - No Longer driving
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Do not for a moment trust the majority of brake fluid testers.

The ones that work boil the fluid and check the temperature that it boils at and these are near £800 to £1,000.

The testers most garages have are a visual unit or an electric unit that tries to check water content via butting a current via the fluid.

There are no proven results from the cheaper units and very few garages can afford to purchase the very expensive units therefore I would change the fluid at the advised intervals.

As always there are people on this forum and other motoring talking shops that are proud as punch in saving the cost of changing brake fluid, not changing crush washers on drain plugs and not changing antifreeze and boast of driving on tyres over 10 years old.

To them a penny saved is a prisoner indeed.

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Scruffy Oik
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Originally Posted By milligoon
Testing it at the reservoir end is pointless when all the work and degradation occurs at the business end.


Absolutely. Unless you can draw off a sample from each bleed nipple, it's not going to tell you much useful - although I have seen cars where the brake fluid was so bad even the fluid in the reservoir was brown.


Tim H.
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Originally Posted By Eddie Cairns
Do not for a moment trust the majority of brake fluid testers.

The ones that work boil the fluid and check the temperature that it boils at and these are near £800 to £1,000.

The testers most garages have are a visual unit or an electric unit that tries to check water content via butting a current via the fluid.

There are no proven results from the cheaper units and very few garages can afford to purchase the very expensive units therefore I would change the fluid at the advised intervals.

As always there are people on this forum and other motoring talking shops that are proud as punch in saving the cost of changing brake fluid, not changing crush washers on drain plugs and not changing antifreeze and boast of driving on tyres over 10 years old.

To them a penny saved is a prisoner indeed.


redcard
This is oh so true.
There comes a point where the “economies” become dangerous, lead to long term problems, breakdowns etc.. Yes.....look for good deals when buying oil/antifreeze,and others such as Halfords offers (I bought oil for two changes last time at the discounted offer) but, come on, when safety is a prime consideration there should be no corner cutting. My brake/clutch fluid is due a change this winter after 2 years. It will be done. Antifreeze too despite it looking ok.
I do draw the line at replacing the air in the tyres with fresh Malvern Hills air though innocent


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What about Malvern spring water for the washers?


2015 Morgan 4/4 (Wolf fettled) previously 2014 M3W
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Another issue is the fact that morgan still uses carbon steel brake pipes. Some manufactures have eventually moved to cupro nickel with brass fittings, both far more noble metals! And therefore no internal corrosion should take place (due water ingress). Its a job i'm scheduling this winter just for my own satisfaction....change out all of the hard piping to cupro-nickel. I did it on the elise at 17 years old but the pipework that was out of sight was terribly corroded..... i'm ashamed of myself!

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Scruffy Oik
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Originally Posted By Lowflyer
Another issue is the fact that morgan still uses carbon steel brake pipes.


I'm amazed to read that. Mine were replaced with Kunifer (cupro-nickel) years ago, I didn't think anyone still used steel. No wonder some of the guys report fluid degradation after only a couple of years.


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Originally Posted By milligoon
Testing it at the reservoir end is pointless when all the work and degradation occurs at the business end.


+2

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Mazda, Subaru and Suzuki still use mild steel brake tubing.

November 2016 our 2007 Suzuki Jimny ( 65,000 miles ) had brake failure due to corrosion just an inch or so from where the tubing was plastic covered.

In 2015 our 2005 Subaru Impreza ( 85,000 miles ) had brake failure due to a broken brake pipe caused by corrosion.

Last edited by Eddie Cairns; 08/10/17 11:19 AM.
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I'm surprised at the number of otherwise intelligent folk who keep a half opened bottle of non silicone brake fluid on the workshop shelf.

Once that foil seals broken and hydroscopic nature of brake fluid, its hard to keep the water out

Arwyn

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