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 Bad Master Cylinder?

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furvedere
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PostSubject: Bad Master Cylinder?   Wed Apr 17, 2013 9:35 am

On Monday I got my 58 DeSoto out into the driveway to check everything out. I replaced the front wheel cylinders and wheel bearings over the winter...the good news is that they seem to be fine...but the pedal is spongy. I feel that I bled the front brakes real well and that I got all the air out. I did not bleed the rears because I did not mess with them. I had a friend look too...he told me that he thought my Master cylinder was bad...when I pushed on the pedal he heard a gurgling sound in the MC. He looked under the dash/backside of the MC and thought he saw a little moisture there too. My question: Is there a definite way to tell if the MC is bad and needs to be replaced?

Thanks,
NYB

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1958 DeSoto Firesweep 2 dr ht
1958 Plymouth Belvedere 2 dr ht
1968 Plymouth Fury III

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PostSubject: Re: Bad Master Cylinder?   Wed Apr 17, 2013 1:43 pm

Generally, if a master cylinder is bad, it will either leak out the pushrod side, or not create any pressure, or the pedal will slowly sink too the floor under pressure. Gurgling noise could be just the fluid movement within, which is normal.

This is a single pot master cylinder, meaning the front and rear hydraulic systems are connected, so I would bleed the brakes again, using this procedure- Start with the wheel farthest from the MC, and continue like this until you complete the last one. Then, adjust the brakes according to the factory service manual, as there is a specific procedure with these brakes.

---John

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furvedere
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PostSubject: Re: Bad Master Cylinder?   Wed Apr 17, 2013 2:02 pm

Thanks John...I will bleed the rears (farthest from MC first) and then see how it goes. My friend tried to show me the moisture (brake fluid?) on the backside/plunger side of the MC but I wasn't convinced. I was also in the garage without the best of lighting. I appreciate your help.

Thank you...

NYB

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1958 DeSoto Firesweep 2 dr ht
1958 Plymouth Belvedere 2 dr ht
1968 Plymouth Fury III

And this is the testimony: God has given us eternal life, and this life is in His Son. He who has the Son has life, he who does not have the Son of God does not have life.
1 John 5:11-12 cheers
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