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Replaced Leakey prop valve, brakes still do not work.

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Replaced Leakey prop valve, brakes still do not work.

Old 01-02-2019, 08:40 PM
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Default Replaced Leakey prop valve, brakes still do not work.

Hello friends. I am working on a 1994 Del Sol. The problem it was having is one day the brake light came on, due to low fluid, and the brake pedal would go all the way to the floor, and barely slow the car down.

Now this is not my car, itís a friends car. I donít know if both of these problems happened at the same time, or if one started happening before the other.

After visual inspection of the brake system, I discovered a leaking proportioning valve. I replaced it (big pita) and bled the brakes.

Problem is the pedal still goes all the way to the floor, and the car barely stops. I visually inspected all of the other lines and components, and I can not seem to find any leaks. Also the brake fluid level is not changing (indicating no more leak, am I right?)

Anyone know what can be causing this? Iím an armature mechanic so please donít bite my head off of the problem is obvious. I appreciate your help. Thanks in advance.

-Cole

Edit: I asked the owner and the brake light and brake pedal becoming soft and happened a week apart from each other. Also, previous owner put in a new master cylinder.

Last edited by Coleproblems; 01-03-2019 at 06:18 AM. Reason: More info added.
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Old 01-03-2019, 04:16 AM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

What process did you use to bleed the brakes??
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Old 01-03-2019, 06:21 AM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

The ďbuddy systemĒ as itís called. One person pumps and holds the brakes as I cracked the bleeder valve. Repeat until no air comes out. Starting with the longest lines from the MC moving to the shortest.
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Old 01-03-2019, 09:33 AM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

since youre no longer leaking fluid now, you need to do a better job bleeding the brakes. keep trying. hydraulics is pretty simple.
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Old 01-04-2019, 04:06 AM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

Originally Posted by Coleproblems View Post
The “buddy system” as it’s called. One person pumps and holds the brakes as I cracked the bleeder valve. Repeat until no air comes out. Starting with the longest lines from the MC moving to the shortest.
In other words, you didn't run a clear line into a container filled with brake fluid. That's why you still have air in the line. You're doing it wrong.
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Old 01-07-2019, 09:56 PM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

Originally Posted by Tyson View Post
since youre no longer leaking fluid now, you need to do a better job bleeding the brakes. keep trying. hydraulics is pretty simple.
Originally Posted by NVturbo View Post
In other words, you didn't run a clear line into a container filled with brake fluid. That's why you still have air in the line. You're doing it wrong.

hello I now know 3 different ways to bleed brakes and 0 ways to make the brakes on this car work.

Brakes have been bled. A lot. Different ways. All proper ways. No more air. But still, pedal to the floor and very little stopping power. Is there anything else it could be or should I hire a professional brake bleeder.
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Old 01-08-2019, 11:20 AM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

replace the master cylinder.
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Old 01-08-2019, 03:29 PM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

Originally Posted by Tyson View Post
replace the master cylinder.
The master cylinder was replaced less than 12 months ago with a new part. Is it likely to be the problem?
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Old 01-08-2019, 03:52 PM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

yeah i read that. previous owner replaced it. your issue makes me think its suspect.

and make sure you bench bleed it. and check the booster push rod gap. http://my.cardone.com/techdocs/PT%2053-0001.pdf
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Old 01-09-2019, 08:34 AM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

Do you have drums? Adjust them
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Old 01-09-2019, 12:24 PM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

Originally Posted by Tyson View Post
Do you have drums? Adjust them
shockingly it has discs front and rear
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Old 01-09-2019, 10:00 PM
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Default Re: Replaced Leakey prop valve, brakes still do not work.

Would ask when this issue started?
Did the brake pedal go all down before the MC was changed?
How is the brake booster? Hose?

If there is no ABS in this car then would suspect that the Master cylinder is faulty.
Pedal goes all down and no brake pressure?
It is not unusual for bad new parts in the auto part industry.
Or even bad re-manufactured parts
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