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Brake pedal question
Posted by: Ron62 ()
Date: March 18, 2019 04:23AM

The brake pedal travels about 3 inches before a solid brake can be felt. Definitely no air in the system. Its not squishy feeling and pumping the pedal makes no difference. Car is not drive able yet so I cant road test the brakes.
Can anyone tell me what the pedal free play should be? Also, is there a way to tell if the Master Cylinder is original ?

Thanks
Ron

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Re: Brake pedal question
Posted by: smithleej ()
Date: March 18, 2019 04:52AM

Not sure on the pedal free play, but your situation usually means a simple brake adjustment is needed.

Lee Smith
Buchanan, VA
1962 Rampside

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Re: Brake pedal question
Posted by: junkman ()
Date: March 18, 2019 05:10AM

The OEM master cylinder will have a part number in the casting at the bottom. How the top cover installs is also another way to tell, but will require a picture and the year of the car to know for certain. Top cover attachment and casting number are both needed for positive identification.

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Re: Brake pedal question
Posted by: Ron62 ()
Date: March 18, 2019 01:57PM

Ill take a look tonight an see if I can find the part number.

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Re: Brake pedal question
Posted by: MattNall ()
Date: March 18, 2019 02:25PM

Ron... you have a Mater Cylinder for Metallics.... smaller bore 7/8" instead of
1".


The pedal will go further...unless you tighten the shoe adjustments





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Re: Brake pedal question
Posted by: joelsplace ()
Date: March 18, 2019 02:35PM

'60-'61, '62-'64 and '65-'69 are different. My recent experience is that LMs have a lot more travel than EMs I guess because of the different pedal ratio.

Joel
Northlake, TX
4 Ultravans, Lost count at 100 Corvairs...

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Re: Brake pedal question
Posted by: corventure Dave ()
Date: March 18, 2019 02:51PM

Depending on the year.. manual brake shoe adjustment or automatic adjustment.
I always check the shoe to drum clearance.
Manual may need adjusting.
Automatic, one or more star adjuster may be stuck.
This usually causes one wheel to lock early, however I have seen more than one adjuster on a same car stuck and the brakes seemed to work evenly but were out of adjustment.

Corventure Dave

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Re: Brake pedal question
Posted by: RexJohnson ()
Date: March 18, 2019 02:58PM

If I remember correctly Ron has a '67 and if that is right there is no 7/8" bore available for the dual M/C. The pedal ratio changed from the '65-'66 to the '67-'69 with the later having more travel with less effort. The push rod attaches closer to the pivit on the later. 3" does sound like a lot of travel.

RJ tools
Salem,Oregon

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Re: Brake pedal question
Posted by: Ron62 ()
Date: March 18, 2019 06:16PM

The brakes, springs, shoes and lines are all new in the rear. Front brakes appear to be working correctly by have to take a closer look. Ill investigate further and post the results.

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Re: Brake pedal question
Posted by: TerribleTed ()
Date: March 18, 2019 06:31PM

Freeplay should be minimal...less than 1/4" before master cylinder starts to move. Have you done a manual adjustment of the brakes? brakes must be manually adjusted until there is a frim drag at each. All of this is in your GM Shop manual. If you do not have one you need it.

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Re: Brake pedal question
Posted by: MattNall ()
Date: March 18, 2019 06:41PM

Is the actuator rod from the pedal's arm have just a little slop?





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