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CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: john302 on December 05, 2009, 09:26:21 PM

Title: 1968 disc brake proportioning valve big nut
Post by: john302 on December 05, 2009, 09:26:21 PM
What is the correct plating on the proportioning valve big nut ?It is for my Dec.67 built 68z. I always thought silver zinc was correct,but the one I just took apart is gray phosphate. Has anyone else seen this before?  Thanks John
Title: Re: 1968 disc brake proportioning valve big nut
Post by: JohnZ on December 06, 2009, 11:38:46 AM
Photo below is my '69 - the master cylinder and booster have been restored, but the metering valve is original and has never been touched.
Title: Re: 1968 disc brake proportioning valve big nut
Post by: sd1968z28 on December 07, 2009, 01:54:05 PM
i think my 68z built  in april it was  plain cast color.
Title: Re: 1968 disc brake proportioning valve big nut
Post by: Jerry@CHP on December 07, 2009, 04:41:11 PM
67 and 68 nuts were not plated silver cad like the '69s.  The '69 nuts are also larger in dia.

Jerry
Title: Re: 1968 disc brake proportioning valve big nut
Post by: john302 on December 10, 2009, 12:29:41 AM
Is gray phosphate the correct plating?
Title: Re: 1968 disc brake proportioning valve big nut
Post by: 68Zproject on December 10, 2009, 06:08:55 PM
Mine was just bare metal, but who knows what it looked like when it left the factory.
Title: Re: 1968 disc brake proportioning valve big nut
Post by: Pex68 on December 20, 2009, 05:27:10 PM
Here's some pic's of a NOS one.  The plating is more of a tin-zinc that's not been buffed or tumbled.
Title: Re: 1968 disc brake proportioning valve big nut
Post by: Jerry@CHP on December 20, 2009, 10:53:20 PM
They were not plated in '67 and '68.

Jerry
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