RE: {Chrysler 300} Silicone dot 5. Brake fluid
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RE: {Chrysler 300} Silicone dot 5. Brake fluid



Ron,

 

I get it, DOT 5 is not for everyone, but it is good to have choices. Here are my comments on your list:

 

“There are a couple of reasons I stick with DOT 3 or 4”.

 

  • Ease of availability. All auto parts stores have it in stock  (my local stores carry DOT 5)

 

  • With DOT 5, I’ve heard reports of low or sinking pedal. Not what I want to experience.  (True if you shake the bottle before installing, and air bubbles get trapped, and then poured into the system. You must be gentle with bottle. Used properly, you won’t have the soft pedal issue and I have used it in several different cars.  I use a vacuum brake fluid fill system (from Harbor Freight) that pulls the fluid through to each wheel instead of having someone pump it from pressing the brake pedal. Less likely to create bubbles by not pumping the pedal.   Definitely don’t use DOT 5 in ABS systems though)

 

  • DOT 5 aerates after accidently shaking. This makes brake bleeding difficult. That won’t happen with DOT 3 or 4.  (True, but don’t shake, and if shaken, let the bottle sit overnight, you can even leave the cap off, it won’t absorb moisture)

 

  • Not in my case, but folks that ‘farm out’ their car repair run the risk of an unknowing mechanic reporting cheerfully that they ‘topped off’ your master cylinder, not knowing that you have DOT 5 in the lines.  (I couldn’t agree with you more on this point. I do all my own work on collector cars, so nobody touches them but me.  This is similar to the tire shop mechanics trying to take LH lug nuts off as RH threads)  

 

Some major benefits that are worth mentioning:

 

DOT 5 is inert (not hygroscopic) and will not suck moisture from the air, so 2-3 year changes aren’t needed, resulting in lower maintenance.  

 

DOT 5 will not damage paint like DOT 3/4 does. If spilled it on a fender or you have a master cylinder leak down the front of your firewall, DOT3/4 will cause damage, some even use DOT 3/4 it for paint remover.  Having written that, if you are planning on painting any car part, you really need to clean it well if it has been exposed to DOT 5 or you will have adherence problems.

 

DOT 5 has a high boiling point of 500 degrees, and stays stable at that temp because it isn’t hygroscopic.  That’s reassuring to me coming back from Reno. My G brakes get plenty hot coming down from the Sierras.

 

I do like DOT 4 Castrol GT LMA (low moisture activity) for daily drivers though.

 

Bob

 

 

 

 

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Ron Waters
Sent: Friday, October 6, 2023 1:06 PM
To: 'Bob Jasinski' <rpjasin@xxxxxxxxxxx>; 'chrysler 300 club' <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: {Chrysler 300} Silicone dot 5. Brake fluid

 

Bob –

 

There are a couple of reasons I stick with DOT 3 or 4.

 

  • Ease of availability. All auto parts stores have it in stock

 

  • With DOT 5, I’ve heard reports of low or sinking pedal. Not what I want to experience.

 

  • DOT 5 aerates after accidently shaking. This makes brake bleeding difficult. That won’t happen with DOT 3 or 4.

 

  • Not in my case, but folks that ‘farm out’ their car repair run the risk of an unknowing mechanic reporting cheerfully that they ‘topped off’ your master cylinder, not knowing that you have DOT 5 in the lines.

 

Ron

 

From: Bob Jasinski
Sent: Friday, October 06, 2023 3:42 PM
To: 'Ron Waters' <ronbo97@xxxxxxxxxxx>; 'chrysler 300 club' <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: {Chrysler 300} Silicone dot 5. Brake fluid

 

Ron,

 

Silicone DOT 5 fluid is lighter than water, so the water (if any) falls the lowest point in the system.

 

When I bought my G in 1978, I installed new hoses, brake cylinders, and rebuilt the master cylinder.   I installed DOT 5 silicone fluid, and did nothing to the system for 18 years except brake adjustments and fluid check, with a rare top-off.  In 1996, I pulled the G out after a 4 month storage period, drove around the neighborhood a bit, and noticed the car pulling to one side when braking. I inspected the front wheel cylinders and found the front lower left cylinder weeping fluid.  I inspected all the wheel cylinders and found a rust patch on the bottom of the lower front wheel cylinders on both sides, no corrosion in the top fronts or rears.   I removed all the wheel cylinders and master and had them sleeved in brass (just to add to the overall safety of the system), and replaced the rubber hoses.  Refilled with fresh DOT 5, bled and adjusted. No problems since.

 

I know there are those on the list that never change out DOT 5, and have not had any issues, but I do it about every 10 years, just to assure safety, and to view the waste fluid.  Previously done in 2011, I flushed again in 2022 right before the Pasadena meet. The fluid was clear and clean, and no water separation evident.  Maybe I should just have bled the front two lowers.   

 

Bob J

 

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Ron Waters
Sent: Friday, October 6, 2023 10:49 AM
To: 'chrysler 300 club' <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: {Chrysler 300} Silicone dot 5. Brake fluid

 

So when moisture accumulates in the brake lines of a vehicle with DOT 5, where does it go ?

 

Ron

 

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx On Behalf Of dplotkin
Sent: Friday, October 06, 2023 12:04 PM
To: John Grady <jkg@xxxxxxxxxxxxxxxxx>; Larry Wood <larryjw7@xxxxxxxxx>
Cc: chrysler 300 club <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Silicone dot 5. Brake fluid

 

I am with John on this, I don't know anyone who has DOT 5 employed properly, thoroughly bled, and the brake parts are otherwise dimensionally correct for the car with a problem ever. In fact my 61 Savoy built in 2007 has the same DOT 5 fill in it to this day no rust no problems anywhere.

 

If you have a hobby car that sits half the year like most of us do north of Mason Dixon, you should be using Dot 5 as it will never screw up your brake system and you will never have to deal with it again.

 

 

 

Sent from my Verizon, Samsung Galaxy smartphone

 

 

-------- Original message --------

From: John Grady <jkg@xxxxxxxxxxxxxxxxx>

Date: 10/6/23 8:26 AM (GMT-05:00)

To: Larry Wood <larryjw7@xxxxxxxxx>

Subject: Re: {Chrysler 300} Silicone dot 5. Brake fluid

 

Hi .. something strange happened here as rust is only possible with glycol . Just the chemistry . not debating the story , but it was not silicone fluid that caused this .

Some kind of mistake in labeling or whatever as water is immiscable in silicone . It’s not possible . Or lines had incompatible fluid in them . I do not know , I don’t doubt story 

 

The military has it in every single vehicle they own , often stored 25 years . They have to work for sure the day pulled out . I have it in 25 cars zero issues other than very hard to get bled right  

Yes you can use glycol and  drain every 3 years . I did not follow that on mercedes due to  negligence on my part it cost me 3000 in brake replacement parts and service —  ABS etc which is incompatible with silicone fluid .

 

But over all my 300’s , over many years I’d say 85 % had a big rust pit on the bottom of the wheel cylinder due to water carried there by glycol . It is designed to hold  water until saturated , and that water should come out when you drain it regularly .

But people  NEVER did that on 300 , as the 85% shows . It comes out of saturation in a cold day at the bottom of the wheel cylinder 

What  happens is it was ok anyway  at a long ago rebuild — when you rebuild brake shoes ( depends on wear ) you push pistons in more it seals ok , but as pistons move out with wear of shoe or worst of all a panic stop , one day you uncover the rust pit at the seal lip and all your brake fluid gushes out . It is at 1000 psi 

Some of us think they know more than the military , while i think that may be true in many areas , it is not true here 

I think the only reason it is not standard fare is very high relative cost especially way back then . And difficult bleeding . 

Your mileage may vary , but your glycol will always absorb moisture at master and carry it to wheel cylinders over many years .

Rust pit shows you that , you have all seen it …. 

jg 

 

Sent from my iPhone

 

On Oct 6, 2023, at 12:14 AM, Larry Wood <larryjw7@xxxxxxxxx> wrote:



I say Ron is right.

I tried dot 5 in my 67 GTX.     With all new wheel cylinders and master cylinder flushed system.       As directed. Refilled with      silicone dot 5. 3 years later i was out for a drive came up on a curve my Brake pedal went to the floor? I took the GTX to the garage and I was dumbfounded.  The wheel cylinder was eat up with rust the fluid was like brown jelly? Was it bad fluid  or what .i have found     no answers yet

.replacing all cylinders and using Dot 4  flush system every 2 years

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