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Old 10-01-2019, 08:14 PM   #1
DD1
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71 C10 Brake Master Cylinder / Booster Questions

Hello, I purchased a used power brake booster and master cylinder for my 71 C10. Thanks in advance for your help.

The Master Cylinder was really nasty, so I ordered a rebuilt MC from Autozone.

I ordered part M1494 which looks the same as the old MC, and I think they sent me part NM1494 (in the M1494 box) which has a smaller rear chamber. Does it make a difference if I use the one with the smaller rear chamber?

On the left is what I received, and on the right is what I ordered. Then is the new one on the left and the old on the right.

Everything fits on the new one. Should I just keep it or return it and get the exact same type of MC?



Regarding the Brake Booster, I don't have the hardware to connect it to the pushrod. Anyone know where I can get the piece that goes in the middle and connects to the pushrod?
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Old 10-02-2019, 06:43 AM   #2
PGSigns
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Re: 71 C10 Brake Master Cylinder / Booster Questions

I would post a wanted ad in the 67 to 72 parts section for the booster parts. The master cylinders are different because one is for drums and the new one looks like a disc application.
Jimmy
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Old 10-02-2019, 05:11 PM   #3
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Re: 71 C10 Brake Master Cylinder / Booster Questions

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Originally Posted by PGSigns View Post
I would post a wanted ad in the 67 to 72 parts section for the booster parts. The master cylinders are different because one is for drums and the new one looks like a disc application.
Jimmy
Thanks, Jimmy. What's interesting is that Autozone lists both MC's as being Disc/Drum. Of course their listing could be incorrect, especially considering they sent me the wrong MC in the right box.

I'll keep the new one as I have front disc brakes.

Thanks for the help.
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Old 10-03-2019, 02:39 PM   #4
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Re: 71 C10 Brake Master Cylinder / Booster Questions

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Originally Posted by DD1 View Post
Thanks, Jimmy. What's interesting is that Autozone lists both MC's as being Disc/Drum. Of course their listing could be incorrect, especially considering they sent me the wrong MC in the right box.

I'll keep the new one as I have front disc brakes.

Thanks for the help.
Either can/will work. The one w/the smaller chamber just needs to be checked on more often over the miles. That being said, you need to know what the bore is for each. Larger vs. smaller bore impacts line pressure.

Manual brake master cylinders typically have smaller bores which yield greater line pressure since there's no additional leverage. Power brake master cylinders have different bores to allow tuning the pedal travel/feel when braking. Sometimes it takes some sorting to get what you like.
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Old 10-04-2019, 08:43 PM   #5
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Re: 71 C10 Brake Master Cylinder / Booster Questions

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Originally Posted by SCOTI View Post
Either can/will work. The one w/the smaller chamber just needs to be checked on more often over the miles. That being said, you need to know what the bore is for each. Larger vs. smaller bore impacts line pressure.

Manual brake master cylinders typically have smaller bores which yield greater line pressure since there's no additional leverage. Power brake master cylinders have different bores to allow tuning the pedal travel/feel when braking. Sometimes it takes some sorting to get what you like.
Thanks for the information. I appreciate it.
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