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I assume you're asking about the push rod between the booster and the master cylinder? If so, no the rod is a fixed length, but there are two different rods used in Corvettes depending on whether it's a shallow or deep piston style master cylinder. 67-76 Corvette masters are shallow style, 77-82's were originally deep style.
The rod coming through the firewall from the pedal has a little bit of adjustment at the clevis on the pedal.
Can we expand on this topic a bit? Do you know off hand the measurements of both rods? Say someone mistakenly put a 77-82 on an earlier car. Would the brakes even work or have a long pedal travel before any braking effect felt?
I assume you're asking about the push rod between the booster and the master cylinder? If so, no the rod is a fixed length, but there are two different rods used in Corvettes depending on whether it's a shallow or deep piston style master cylinder. 67-76 Corvette masters are shallow style, 77-82's were originally deep style.
The rod coming through the firewall from the pedal has a little bit of adjustment at the clevis on the pedal.
I think you may have the piston styles reversed. i believe the older MC have the deep hole in the MC and the later have the shallow. the early pushrod is adjustable and the later is fixed as you said. i base this on the fact that last year i had to replace my MC on my 71 and the MC i purchased from ZIP had the deep hole. back in the 80's i had to replace the mc and the parts store sold me the booster and MC together. i installed and everything was fine until last year when the mc started leaking out the back. long story short when i went to put the new mc on i could not because the booster/mc combo i was sold 35+ years ago was a later model set up with the short fixed length rod which was no where near long enough to be of use with the early mc with the deep hole piston. i had to purchase a correct early pushrod to be able to use my new MC. probably if you replace the booster/mc together the old and new are interchangeable but you can not put a old mc on a newer booster with the short fixed rod and vice versa.
The booster on my 71 had an adjustable M/C rod. I have no idea if it was original. When I replaced the booster the new one had two solid rods, long and short, neither of which worked just right for my M/C. So I had a machinist turn down and shorten the adjustable rod from my old booster.
Thank you for bringing this to our attention. Unfortunately, if the people it happened to cannot or will not file a complaint at. https://www.nhtsa.gov/report-a-safety-problem#index There isn’t much point in discussing anything further. I think all of us that have been watching this since it was posted are waiting to see if you as the moderator of the group in question have forwarded this link and the individuals involved have responded and verified that they have indeed reported this, why in the world they wouldn’t is beyond me given that their life was at stake. Here’s hoping you get that verification and I would like to know how many this has happened to that we know of.
Thank you for bringing this to our attention. Unfortunately, if the people it happened to cannot or will not file a complaint at. https://www.nhtsa.gov/report-a-safety-problem#index There isn’t much point in discussing anything further. I think all of us that have been watching this since it was posted are waiting to see if you as the moderator of the group in question have forwarded this link and the individuals involved have responded and verified that they have indeed reported this, why in the world they wouldn’t is beyond me given that their life was at stake. Here’s hoping you get that verification and I would like to know how many this has happened to that we know of.
Yer outta your mind, such a simple thing to notice when assembling, can't tell the brakes don't work right?? or are bound up by too much pressure/rod length?? it's an easy thing to fix/notice.....jeez.....come on man..
Thank you for bringing this to our attention. Unfortunately, if the people it happened to cannot or will not file a complaint at. https://www.nhtsa.gov/report-a-safety-problem#index There isn’t much point in discussing anything further. I think all of us that have been watching this since it was posted are waiting to see if you as the moderator of the group in question have forwarded this link and the individuals involved have responded and verified that they have indeed reported this, why in the world they wouldn’t is beyond me given that their life was at stake. Here’s hoping you get that verification and I would like to know how many this has happened to that we know of.
Is this mis-posted? Doesn't seem to match the topic or length of the thread to date. If not mis-posted, obtaining and using the appropriate rod is the responsibility of the person installing the replacement component. Additionally, is the NHTSA really going to take a complaint on a 50 year old car?
Originally Posted by pspicci
the early pushrod is adjustable and the later is fixed as you said. i base this on the fact that last year i had to replace my MC on my 71...
Is this mis-posted? Doesn't seem to match the topic or length of the thread to date. If not mis-posted, obtaining and using the appropriate rod is the responsibility of the person installing the replacement component. Additionally, is the NHTSA really going to take a complaint on a 50 year old car?
My '72 is the same with the adjustable rod.
This is an mis post it is supposed to be in a thread on C8 and C8 Z06 corvettes! Don’t know how it got in the wrong place sorry
hopefully this issue is fixed, i assume so.... one thing i noted, when you push on the brake pedal for bleeding, you can see the reservoir flex quite a bit... i wonder if related, and if it gets the rod out of compression and into a bend torque?
The early C3 had a 1-1/4 deep master cylinder hole the later ones had a 1 inch. The early C3 had an adjustable booster rod, later ones were fixed. 68-72 is early and I believe thru 76 is the same. I just did a swap to find my rod was not properly adjusted. Problem fixed.
My issue was a low brake pedal and an adjustment on the rod cured the issue.
