Factory Fitted Caliper Help ? - Impala Tech
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post #1 of 7 (permalink) Old 01-05-2020, 11:29 PM Thread Starter
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Factory Fitted Caliper Help ?


I have factory fitted 4 piston calipers on the 67 and are on the second rebuilt set in 4 years.
I have found out the hard way that having the car sit round doesn't help them either (Rust in bores).


I'm now getting a set stainless sleeved at a cost of $110 Aus a half (X 4 = $440) Yes expensive.........
My question is, can I use o'rings on the pistons or do I have still use the old lip design seals?
Do I need to change the pistons to newer one to use the o'rings?


I found on the Ecklers Corvette site a kit to change 65-82 year caliper to o'rings,


https://www.ecklerscorvette.com/corv...1965-1982.html


can I use that kit once I have sleeved my calipers?

That is I'm believing my 67 Impala calipers to be the same internally?


I know some of you would suggest just changing the whole front brake system over to Wilwood or the likes, but.
I have disk brake front spindles I'd need to change for new (CPP $159 pair) or second hand, wrecking yard (Aus - Nil, USA very few)


The new Wilwood brake kit is 140-12022 Summit Racing $902 USD ($1300 Aus + freight $3-400)
Affordable, yes but not original.


There is nothing wrong with the factory setup when working right, I'm more than happy to keep them.
I just need some advise if anyone can help,


Thanks,
Chris.
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post #2 of 7 (permalink) Old 01-06-2020, 02:36 AM
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I would retain the lip seal cups. With stainless steel sleeves you should no longer have corrosion problems. Just remember to change the brake fluid with a full flushing of system every two years or so to get rid of any moisture the brake fluid picks up.

Since the Girling style brakes were used on the Corvette from 1965 through 1982 a Corvette board will have the definitive answer to your question as to the pros and cons of modifying the brakes.

Big Dave
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post #3 of 7 (permalink) Old 01-07-2020, 06:29 PM Thread Starter
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Thanks for the advise Big Dave,
Especially about the brake fluid, some thing always over looked me included.
I did go to a Corvette site before posting here and look at previous posts, the general consensus was the o'rings were better
That is after the stainlees steel sleeving had been done.
I'll see if I can post on a Corvette site and get their opinion as well and report back.

Cheers,
Chris
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post #4 of 7 (permalink) Old 01-08-2020, 11:14 PM Thread Starter
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Update

[QUOTE=unda_da_bonet;227484]

Can I use that kit once I have sleeved my calipers? Apparently Not!

That is I'm believing my 67 Impala calipers to be the same internally? Not If my measurements are correct?


I've taken my original calipers apart and did some measuring of the bore size and the size of the piston and here are the measurements :


Internal bore size is 2 and 1/16th or 52 mm


Piston diameter is 2 inch exactly or a smidgen under 51 mm


Haven't got a reply from the corvette people yet.
I did some digging on the web and found most or general consensus says the C3 Corvette piston size for the front is 1 and 7/8ths


I only hope I'm measuring it correctly and if anyone has a Impala front disc piston lying around and cares to measure it for me to confirm that would be great.

I don't hold much hope of that happening though..............


Should I here back from the Corvette people I'll keep you updated.



Thanks,
Chris.
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post #5 of 7 (permalink) Old 01-09-2020, 12:40 AM Thread Starter
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Conclusion

Well I've done some more investigating (anybody would think I have nothing better to do) and found Rockauto has both Impala and Corvette pistons.
They are in fact different.


Impala Piston :2.057"

https://www.rockauto.com/en/moreinfo...21478&jsn=2248


Corvette Piston :1.87"
https://www.rockauto.com/en/moreinfo...=2221&jsn=2221


So in conclusion the Front disk brakes on a 67 and early 68 Impala are a year/model specific option and not as interchangeable as I first thought.


I'm now leaning towards replacing them with Wilwood.


Cheers,
Chris.
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post #6 of 7 (permalink) Old 01-09-2020, 12:27 PM
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One other option that I would consider if it were my car would be to substitute reproduction Corvette brakes off of a 1968-'82 (C3) brake system. You need to swap the steering knuckles and everything that bolts to it as the spindles differ in size.

People have been doing this swap (and other Corvette parts onto to their Chevys) for years:

https://www.chevytalk.org/fusionbb/s...hp?tid/337227/


It will look stock when done and everything should fit as the factory intended if you get one year for all of the parts.


Big Dave
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post #7 of 7 (permalink) Old 01-09-2020, 09:52 PM Thread Starter
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Interesting Reading

Thanks Big Dave,


A lot of good information there.
I have since found a lot more information on that site re converting the front to C3 disc brakes.


My only problem with that is we don't have to many wrecked C3 corvettes in this part of the world and the freight cost would be the same for new parts as well as second hand parts shipped to Australia.


Ecklers have a good array of new C3 front end stuff to convert my 67.


Not to mention there is always Wilwood.............


Still weighting up my options.


Cheers,
Chris.
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