Master cylinder cover

[BillOhio]

Anyone have a good picture of a 69 power front disc cover? Need picture of top/lettering
Thanks

[BillOhio]

My lid is not with me but I think it had wording around each bubble. I found this one. Seen some vendors have pictured one as correct for a 69z. Read a thread where both may have been used. Any opinions?

[cook_dw]

Ill look at the couple I have at home and post pics but as far as which one is correct I am not sure.

[ko-lek-tor]

I, too, have read about more than one cover for 69. I cannot prove that my cap is, in fact, "born with", but I have every reason to believe it is, as the orig. master cylinder is on the car (off now) 12B Nor. Bill, here goes:
Will also comment on the cap you picture Bill, I understand that there was no DOT specification in 69, so that cap would be wrong,IMO.

[HOT3O2]

Maybe we could get some of guys to chime in that have known original caps. I have been looking for one myself I would like to make sure it's right. Also was there only one cap used through out the production year? (69)

[69Z28-RS]

Here is my original cap, it was replated when I had my booster rebuilt by Grigori...
I can take a 'straight on' photo to capture all the textual information if need be...

[6667ss138]

My original cap looks exactly like Gary's, word for word and number for number. Just has not been re-plated so not as pretty

[BillOhio]

From what I remember mine looks like Bentleys and Gary's. Its at gregoris and had more pits than I liked. Garys looks really nice

[cook_dw]

FYI those pits and scratches can be worked out with time and patience.

Before


After - Notice that this is the style like the one you posted Bill.



Plated

[cook_dw]

Also Gary's is different than ko-lek-tor's.  Garys has SAE J1703 Brake Fluid

[69Z28-RS]

My original cap looks exactly like Gary's, word for word and number for number. Just has not been re-plated so not as pretty

Maybe we got that 'special MC cap..    reserved for the special HO camaros..

[cook_dw]

Maybe we got that 'special MC cap..    reserved for the special HO camaros..

Caption should read:

OMG....

[Mike S]

Also Gary's is different than ko-lek-tor's.  Garys has SAE J1703 Brake Fluid

Ko-lek-tor's looks like a 67 cap.

Mike

[6667ss138]

My original cap looks exactly like Gary's, word for word and number for number. Just has not been re-plated so not as pretty

Maybe we got that 'special MC cap..    reserved for the special HO camaros..

Yep, thats exactly what I was thinking...

[Boston14]

My early 1969 11D (68) SS/RS was born with the same cap that  ko-lek-tor has posted.  I believe the caps were an early vs. late thing.  Can't swear to a changeover date, but, I know mine is original.

boston14

[z28z11]

My X77 01C Z's cap looks like ko-lek-tor's, no DOT, no J spec. Could not get resolution tonight, will try for pic tomorrow (cap is unrestored, pretty crusty).

Regards -

[Marty]

My 68 cap also looks like the one ko-lek-tor posted. I bought the master cylinder with a July 68 booster. Martin

[cam69aro]

my 03E `69 is the same as Gary`s too, only it got chromed in the 70`s 

[Mike S]

As a suggestion, if the cover you have is pitted, instead of getting one with surface pits redone, you can buy an exact repro (shape and stampings) for around $25 from many Corvette parts places. Outside from correct fonts there are no date codes to worry about.
There are two type of repros I have seen where it comes to the 4 vent holes on the sides of the cover under the bail wire. Some have the vent punches facing out and others have it facing inside. I have only seen inside facing vents (like those shown by ko-lek-tor) and those on my 67's.
 The place that has correct looking caps with the inside facing vents: http://www.westcoastcorvette.com/

Mike

[cam69aro]

here a pic of mine, chrome and all. any easy or good way to remove the chrome ? i read brake fluid will take it off ?

[69Z28-RS]

Plating shops can strip it off for you, and possibly they can replate it as you like..  I don't think brake fluid will remove chrome..  (but I was wrong once before.. at least.. )

[cam69aro]

for now i plan on leaving the chrome, it preserved it well over the last 35-40 years

[69 Zee]

Not sure if GM used different covers, but I know for sure that Ko-lek-tors is original.  It has the exact same lettering as my 03B Z garage/barn find was found with (pic below).  It's an original untouched cover like many other of my parts.

[69Z28-RS]

A little background information from the SAE standards committee on the J1703 brake fluid std, thru the period 1967-1970...

From the SAE website:       History of the SAE J1703 standard...

J1703C_197107         1971-07-01 Historical Revised
J1703B_197007         1970-07-01 Historical Revised
J1703A_196804         1968-04-01 Historical Revised
J1703_196709           1967-09-01 Historical Revised

-------------------------------------------------------------------------------
Motor Vehicle Brake Fluid           Standard       1967-09-01

This SAE Standard covers motor vehicle brake fluids of the nonpetroleum type for use in the braking system of any motor vehicle such as a passenger car, truck, bus, or trailer. These fluids are not intended for use under arctic conditions. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM).

[ss jim]

Mine looks like Gary and Eldon's. Especially Eldon's because I had mine chrome plated in 1980. I bought the car in April 1971. Car is 1969  01C, X55. Jim

[zdld17]

Guys, are we talking about two styles of caps or one.    Tall/narrow or short /fat ?  I thought there were two styles.

[enio45]

also - later 69 caps have the vent holes on the side......

[68camaroz28]

To help establish info here is a lid off a 5/31/68 dated Engineering Unit that was never installed. Parts List that came with unit lists cover as #5455517

[z28z11]

Chick,

Wow - what a piece. Time capsule -

Regards,
Steve

[68camaroz28]

Just posted this on the thread on the late 1969 09D Z/28 survivor and thought would post here as well for future searches.

[KurtS]

Both have: Service With Delco Parts

Version 1 has: Use Delco Brake Fluid
67 & 68 cars &
11D
12B
01C
03B

Version 2 has: Use Delco SAE J1703 Brake Fluid
01C
03E
07A
09D
09C

So apparently there was a transition in mid-69 when both were used.

[Mike S]

 If you want more samples then I'll add my '67 04B and 05B has the original covers s with the Use Delco Brake Fluid stamp.

Mike

[KurtS]

I'm assuming all 67 & 68 cars have the Version 1 cover. I have never seen anything to contradict that.

Thanks!

[Stingr69]

I don't have many important pieces still left on my car that I could reasonably believe were original BUT I do believe that this master cylinder/cover/booster is original.  This is a valid datapoint for this '69 Z built first week of October '68.  So glad I have something to contribute. 

-Mark.

[HOT3O2]

Hey Mark, What's the date code on your master cylinder?

Rick

[Stingr69]

Date Code for above.  Should line up for a 10A of '68 for a '69 model year car.

[hubleyman]

My 10A of '68 1969 Z/28 master cylinder has a date code of 241.  I believe it is original to the car?

My original cover is the version 1 style (which I still have), but I currently have the version 2 style on the car - that I stole from my Jan of '69 Z/28.

[Stingr69]

My 10A of '68 1969 Z/28 master cylinder has a date code of 241.  I believe it is original to the car?

My original cover is the version 1 style (which I still have), but I currently have the version 2 style on the car - that I stole from my Jan of '69 Z/28.

Sounds like a similar data point. Date code is 2 days away from mine and we have the same production week.  

I have a good original steering box as well.  I bet those would be close too.

-Mark.

[HawkX66]

My original is pretty rough, but here it is if it helps. Gary's Z and my SS are only a few days apart. Our caps are the same.
You think this scratches will buff out with some time and patience Darrell? Nah, didn't think so lol. Hopefully I can clean it up some though.

08D

[bc69]

So with 3 or more shown and spoke of here.....
Which cap is the one used on the 5460346 WT in 67?
Did they have more than one cap at a time or all masters as time went by change what was used?