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Will all the brake fluid leak out if one of the chambers is leaking?

Tiny
DAVE213
  • MEMBER
  • 2019 HYUNDAI ENTOURAGE
  • 1.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
If a dual circuit system had a leak on one of its circuits, does the brake fluid all leak out after repeated pumping?
Monday, January 11th, 2021 AT 7:55 PM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

The answer is no. Only the chamber with the leak will drain and the other will remain at its level.

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

I attached the diagram of the system for you when you are looking for leaks.

Roy

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Monday, January 11th, 2021 AT 8:21 PM
Tiny
DAVE213
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But will the brakes still be firm or not? And how long can someone drive with the spare circuit?
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Tuesday, January 12th, 2021 AT 12:07 AM
Tiny
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No, the pedal will be half at best and the stopping distance will be greatly increased.

I would not drive it that way at all. I would get it fixed ASAP.

Roy
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Tuesday, January 12th, 2021 AT 3:24 AM
Tiny
DAVE213
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So no floor touching.
I think it gives the same symptoms of failing master cylinder if I am not wrong.
Well, how far can you go if one of the circuit is broken?
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Tuesday, January 12th, 2021 AT 3:26 AM
Tiny
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Again, I would not drive it with the pedal that low. It is an extreme safety hazard and needs to be repaired.

I would not drive more than the distance to a repair shop.

Roy
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Tuesday, January 12th, 2021 AT 3:38 AM
Tiny
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Yes, I know usually in single circuit system ince the fluid is over the brakes stop working.
Does it take the same time for the dual system to stop working or take longer?
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Tuesday, January 12th, 2021 AT 3:42 AM
Tiny
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When you have only one portion working, the pedal reaction time and distance for stopping are greatly increased as I stated before.

Roy
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Tuesday, January 12th, 2021 AT 3:49 AM
Tiny
DAVE213
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Thanks Roy.
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Tuesday, January 12th, 2021 AT 3:54 AM
Tiny
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You are welcome.

Always glad to help.

Roy
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Tuesday, January 12th, 2021 AT 4:00 AM

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