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I owned a 1951 Dodge Crusader,  with stock brake system..

Should I switch to DOT 5 brake oil, or stick with DOT3 spec oil,, 

with DOT5, you have to flush the brake system,,  But do you have to replaced all rubber composants??

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Here's a good read: 

 

https://techtalk.mpbrakes.com/brake-fluid/can-i-use-dot

 

After reading that, I concluded that the answer is no.  But, your car, your money, your decision.

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Are you having wheel cylinders seizing up with corrosion from not being driven enough?

Is the car stored in a unheated and possibly somewhat damp building?

If you answer yes to the above DOT 5 is a good fluid to use.

Yes you have to replace all rubber..hoses and cylinder cups and residual valve.

Silicone fluid will leak on any pitted cylinder. So new or sleeved cylinders should be installed.

If you drive the car a lot, live in relatively dry country and flush the DOT3 fluid every 2 years...and the braking system has never been much of a problrm stick with DOT3...preferably higher temp DOT4.

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1 hour ago, kencombs said:

Here's a good read: 

 

https://techtalk.mpbrakes.com/brake-fluid/can-i-use-dot

 

After reading that, I concluded that the answer is no.  But, your car, your money, your decision.

I can not make the link to work!!

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I have used DOT 5 inmy 39 Desoto for over 30+ years. Knock on wood no major issues.

 

Yes you will need to flush the entire system with denatured alcohol. replace all rubber hoses and rubber cups and rebuild your mater cylinder.

 

Rich Hartungj

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3 hours ago, lepic56 said:

I can not make the link to work!!

Well, I tried it and it won't go direct to the tech article  But, delete everything after .com and go to there home page Now select 'tech talk', then search the site for dot 5.  It is there.  Promise.

 

Bottom line for me, a lot of extra work and cost, unless you are planning on all new stuff anyway, with a small risk of rust anyway, and very little return.

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18 hours ago, lepic56 said:

I owned a 1951 Dodge Crusader,  with stock brake system..

Should I switch to DOT 5 brake oil, or stick with DOT3 spec oil,, 

with DOT5, you have to flush the brake system,,  But do you have to replaced all rubber composants??

No, stay with Dot 3 

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