[Broker]

Which bowl controls the front brakes and which controls the back brakes? This should help me narrow the problem down. 4 drum original brakes. Master cylinder looks replaced but with an OER part. I am getting spongy brakes. And one other question. Is the gasket for the MC lid supposed to be flat or should they basically have 2 (cones for lack of a better term) sticking down into the bowls?

 

[SoCal805]

Back when I had drum brakes my MC had a large single rubber gasket with lid of MC held on with one center bolt vs a clip

Just look at the brake line coming from the bowl that is low...does it route to front or back?

When I did replace that MC I just bought one at NAPA and it looked the same as a stock one

 

[ilikeike]

front control the front back is back. unless someone did something "special" . lol.

You probably have a blown wheel cylinder.

 

[Broker]

front control the front back is back. unless someone did something "special" . lol.

You probably have a blown wheel cylinder.

No the car is 90%+original including brakes. And my money is almost 90% on the wheel cylinder somewhere. I pulled 1 drum off last night to see if there was an issue there and there wasn't. It was getting late after I had installed the original seatbelts back into it (previous owner had put putty in all of the holes so they were difficult to find. So tonight I am going to pull the 2 back and see if one looks blown out or try to find fluid leaking.

 

[Georgia68]

Here is the schematic of the front lines. It should help.

Try the hard, harder, HARDER test on the pedal. You may find your leak a bit quicker.

 

[Broker]

Here is the schematic of the front lines. It should help.

Try the hard, harder, HARDER test on the pedal. You may find your leak a bit quicker.

View attachment 283788

I'm not familiar with the hard, harder harder test

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[Vega$69]

I'm not familiar with the hard, harder harder test

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Pump it hard 10-15 times to accelerate any leaks you may have

 

[Georgia68]

Push hard on pedal, release then push harder again on it. Release then push hard as you can to see if pedal will go to floor under all the pressure you can put on the pedal. If you have a leak, it show itself under this test.

 

[Broker]

Thank ya'll. I'll try this and see where fluid is coming out. I just checked the MC and all of the fluid had drained out of the back bowl in 1 day

 

[SoCal805]

I just checked the MC and all of the fluid had drained out of the back bowl in 1 day

If it puked that much fluid the leak point should be easy to see. Also check the rear center soft brake line/connection above/center rear axle housing

If its wheel cylinder, replace both and if the rear center soft line is of unknown age, replace it also

refill MC first if you do intend to "pump brakes"

 

[Broker]

If it puked that much fluid the leak point should be easy to see. Also check the rear center soft brake line/connection above/center rear axle housing

If its wheel cylinder, replace both and if the rear center soft line is of unknown age, replace it also

refill MC first if you do intend to "pump brakes"

I would think it would be very easy to see but I've seen no evidence of a leak anywhere on the ground. Truly baffling. For now

 

[allanjs]

Do you have power brakes? The master could be leaking from the rear and filling up the booster. I just had that happen on my DD 2 weeks ago.

 

[Broker]

Do you have power brakes? The master could be leaking from the rear and filling up the booster. I just had that happen on my DD 2 weeks ago.

Manual brakes

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[Sauron67MM]

If the car does not have power drums the leak should be obvious. Yank the wheels, crawl under the car and inspect the system.

With the treatment they put on the roads today, I've lost track of how many leaks I have diagnosed. Not to mention every other repair shop owner I deal with.

 

[Broker]

If the car does not have power drums the leak should be obvious. Yank the wheels, crawl under the car and inspect the system.

With the treatment they put on the roads today, I've lost track of how many leaks I have diagnosed. Not to mention every other repair shop owner I deal with.

That's my plan for this evening. I'll find it.

 

[Georgia68]

Pull your carpet back around brake rod going to MC to see if fluid is coming into the car.

 

[Broker]

Looks like I may have found my leak

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[Vega$69]

It's been leaking for a loooong time

 

[Broker]

It's been leaking for a loooong time

Yeah. I've got this though

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[Vega$69]

Yeah. I've got this though

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Always good when you actually find the issue.

Easy fix🤙