C7 M7 questions
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Joined: Apr 2022
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From: Phoenix
C7 M7 questions
I have a 2014 Corvette z51 82k miles with the manual transmission. I was shifting yesterday on the way home. Clutch pedal fell to the floor. I can pull it out and it will stay all the way with no pressure. Slighted bit of push and it pops to the floor. My fluid looks dirty but it appears not to be leaking. Would the master cylinder leak if it was bad?
I was able to drive it home without a clutch so I know the clutch is good. I read some places on the internet that said to ranger change the fluid. Not sure I will have time to get to it today. Should I just plan on changing the master or try to bleed it first? Not super thrilled if it is the slave.
I was able to drive it home without a clutch so I know the clutch is good. I read some places on the internet that said to ranger change the fluid. Not sure I will have time to get to it today. Should I just plan on changing the master or try to bleed it first? Not super thrilled if it is the slave.
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From: Phoenix
Is there anyway troubleshoot the master short of changing it? I guess if it the slave I am in for a decent sized job.
I recently bought my C7 so the little research I have read says you have to pull the engine to change the slave? That cannot be right? At that point I might as well change clutch and all that too since I will have it out.
I recently bought my C7 so the little research I have read says you have to pull the engine to change the slave? That cannot be right? At that point I might as well change clutch and all that too since I will have it out.
Melting Slicks
Joined: Jan 2004
Posts: 2,299
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From: Fort Worth TX
St. Jude Donor '14-'15
Do this first; use a Turkey baster to suck out all the old fluid, refill with fresh then have a seat and push the clutch in and out at least 30 times. The clutch fluid will turn black, rinse and repeat until the clutch fluid stays clear. The most likely problem is you clutch fluid has not been serviced for a few years and is long overdue. This issue is very common for M7 cars that don't follow servicing all car fluids. What happens is the clutch dust works its way into the slave via the actuation of the clutch rod traveling in and out, carrying clutch dust particles past the O-ring seal into the slave fluid reservoir. This will gum up slave piston and causing it to stick.....hopefully this will fix your problem, otherwise it's a very costly fix having to pull the drive train to get to the slave cylinder.
Good luck!
Good luck!
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From: Phoenix
I sucked the fluid out and replaced it. I don’t think any of the fluid is cycling. I only had to cycle it 3 times before it was clear. The second time it was almost clear but I couldn’t get it all out with what I was using.
if it isnt cycling at all. It has to be the master no? If the slave was stuck, wouldn’t the pedal have pressure still and near impossible to press down unless I had a leak?
if it isnt cycling at all. It has to be the master no? If the slave was stuck, wouldn’t the pedal have pressure still and near impossible to press down unless I had a leak?
Drifting
Joined: Sep 2019
Posts: 1,913
Likes: 1,957
From: Colo Spgs, CO
I also think this may be more than just a fluid problem. You can, however, do better than the Ranger method... Move over Ranger Method! DIY clutch fluid flush tool
Good luck!
Good luck!
Thread Starter
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Joined: Apr 2022
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From: Phoenix
The clutch pedal is just for looks at this point. Pushed all the way down, it doesn’t disengage the clutch.
If I press the clutch in with the reservoir cap off, I should see the level change or movement? Nothing is happening.
If I press the clutch in with the reservoir cap off, I should see the level change or movement? Nothing is happening.
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Burning Brakes
Joined: Apr 2021
Posts: 960
Likes: 270
From: Western PA
I haven't owned a Corvette long enough to know exactly how the clutch pedal works the cylinder but I would think there would be linkage under the dashboard. Maybe take a light and a mirror and look under there and see if something came undone.
Melting Slicks
Joined: Jan 2004
Posts: 2,299
Likes: 387
From: Fort Worth TX
St. Jude Donor '14-'15
I sucked the fluid out and replaced it. I don’t think any of the fluid is cycling. I only had to cycle it 3 times before it was clear. The second time it was almost clear but I couldn’t get it all out with what I was using.
if it isn't cycling fluid at all. It has to be the master no? If the slave was stuck, wouldn’t the pedal have pressure still and near impossible to press down unless I had a leak?
if it isn't cycling fluid at all. It has to be the master no? If the slave was stuck, wouldn’t the pedal have pressure still and near impossible to press down unless I had a leak?
Not knowing your mechanical experience, if this was my car, I would pull the master off and check out the movement (or lack of movement) of the piston. Using only brake fluid, clean the piston and master cylinder, do not use brake clean, thinner or another kind of petroleum product. This will swell the rubber and majorly muck up everything. If the master is working OK, then you have a more complicated ($$$$$) problem that will probably require a shop.
And the comment about checking the clutch linkage???? on a Hydraulic system.....really???
Good luck, let us know how it goes and what was needed to be replaced.
Thread Starter
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Joined: Apr 2022
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From: Phoenix
I think you are right. I couldn’t find a replacement part in my town and the soonest I could get it is Thursday. I was going to open it up and see about getting it running but figured I will wait till I have a part to replace it with. I will keep you updated.
Advanced
Joined: Jul 2015
Posts: 83
Likes: 69
From: Richland, Washington
I also think this may be more than just a fluid problem. You can, however, do better than the Ranger method... Move over Ranger Method! DIY clutch fluid flush tool
Good luck!
Good luck!
Last edited by RCollier; Apr 11, 2022 at 11:12 PM. Reason: addition
Drifting
Joined: Sep 2019
Posts: 1,913
Likes: 1,957
From: Colo Spgs, CO
I have been using the Ranger method on our factory ordered 2016 since the car was new. Out of curiosity I purchased the items for this alternate method and found there to be no change at all. If the Ranger method is done regularly it is all that is needed. Our car is approaching 58K so should provide a good longer term example. The fluid that was forced out from 16" down the line was clean.
Racer
Joined: Sep 2016
Posts: 358
Likes: 227
I'm glad you're happy with the Ranger method. Unfortunately, my experience aligns more with @C5Natie than yours. I did the Ranger method followed by this and, as shown in the video, it removed more tired and dirty fluid from the line.
Hawkbarr
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Joined: Apr 2022
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From: Phoenix
Stupid issue and maybe I will ask for some guidance. I got it tore apart and the master cylinder had rotated out. I got it spun in but and the clutch is working. It says now to engage clutch to start. Is there a fuse or something that probably went bad? I don’t see a sensor on the master cylinder that could have been damaged.
Also, I don’t believe I got it all the way out snapped in. Yep I was trying to rotate it from the inside without marginal success. Any recommendations?
Also, I don’t believe I got it all the way out snapped in. Yep I was trying to rotate it from the inside without marginal success. Any recommendations?
Drifting
Joined: Sep 2019
Posts: 1,913
Likes: 1,957
From: Colo Spgs, CO
Stupid issue and maybe I will ask for some guidance. I got it tore apart and the master cylinder had rotated out. I got it spun in but and the clutch is working. It says now to engage clutch to start. Is there a fuse or something that probably went bad? I don’t see a sensor on the master cylinder that could have been damaged.
Also, I don’t believe I got it all the way out snapped in. Yep I was trying to rotate it from the inside without marginal success. Any recommendations?
Also, I don’t believe I got it all the way out snapped in. Yep I was trying to rotate it from the inside without marginal success. Any recommendations?
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 396
From: Austin, TX
Some reference pictures.
