CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: john302 on December 06, 2009, 02:26:21 AM

Title: 1968 disc brake proportioning valve big nut
Post by: john302 on December 06, 2009, 02:26:21 AM

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, 04:38:46 PM

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, 06:54:05 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, 09:41:11 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, 05:29:41 AM

Is gray phosphate the correct plating?

Title: Re: 1968 disc brake proportioning valve big nut
Post by: 68Zproject on December 10, 2009, 11:08:55 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, 10:27:10 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 21, 2009, 03:53:20 AM

They were not plated in '67 and '68.

Jerry