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You can change the reservoir fluid. It's better than doing nothing. Everytime you press the brakes, it takes a bit from the reservoir and mixes inline. Since you're under the hood anyways doing the clutch fluid every 2-3 weeks, why not do the brake reservoir? (only if the color has changed, if it's full clear don't bother)
That is an infinitesimal bit at the most. The clutch hydraulics have a longer stroke so fluid flows back and forth in the circuit as you press and release the pedal. The brake system doesn't have anywhere near that much movement. The pads maintain contact with the rotors and the hydraulic system applies pressure to the pads. The only movement that occurs in a properly operating brake caliper is the almost un-measurable amount required to compensate for brake pad wear from one application of the brakes to the next when the wheels are actually rotating. If the car is stationary when the brakes are applied there isn't any wear and thus no movement of fluid.
Spend $75 on a Motive Power Bleeder; awesome tool to have! Just did all four corners with two bleed screws per wheel (Wilwood setup) in 15mins the other night. This makes it a one person job and you get it done without error.
Just FYI - I use a Motive Power Bleeder, but only as a pressure source. In the picture below the jug is empty and just being used to supply pressure to the fluid in the reservoir to push it through the lines and out the bleed valves of the calipers when when doing a one-person flush/bleed of the brakes:
The unit is designed to put brake fluid in the jug, but if you do you're going to end up throwing away a LOT of good brake fluid!!
Once you pour fluid into the jug of the Motive, you can't save it after you're finished flushing/bleeding your brakes - it's junk!!
Even fluid that remains in the container it comes in only has a limited shelf life once the container has been opened - you can read posts that say it may only be good for a couple weeks to a couple months.
So....you can use your Motive however you want, but I just use it to provide pressure for one-person flushing/bleeding.
You can change the reservoir fluid. It's better than doing nothing. Everytime you press the brakes, it takes a bit from the reservoir and mixes inline. Since you're under the hood anyways doing the clutch fluid every 2-3 weeks, why not do the brake reservoir? (only if the color has changed, if it's full clear don't bother)
Tell me your not doing the clutch fluid every 2-3 weeks. More like every 2-3 years. I changed mine once three years ago. Was going to change it this winter, never had the time.
Tell me your not doing the clutch fluid every 2-3 weeks. More like every 2-3 years. I changed mine once three years ago. Was going to change it this winter, never had the time.
I agree. Have had C5s and C6 since 97 and never had an issue with the clutch fluid. In all of those years I changed it 3 times. Once on my 03Z when I had to replace a bad clutch and twice on the C6Z. First time on that was when the engine was being replaced I had them install a remote clutch bleeder line and then 1.5 years after that I used the bleeder to bleed the clutch. Did that about a month ago with the Pentosin Super DOT4 fluid that GM recommends and it is still clear after driving 3500 miles with lots of stop and go traffic and some off highway high speed stuff. Might change it again next year if I think of it.
I am of the Camp that says yes Change fluid BUT I only change fluid when doing a Brake job generally.
I do a Lot of Hiway driving every day which includes driving over a 4500' summit on my daily commute.
I watch so many people ride their brakes going down the hill, I don't I mostly own manual trans cars so I down shift to a lower gear and my breaks last forever.
I do a lot of brake jobs on the side for many people.
That being said When I do a Brake job for myself or a customer I change break pads, shoes along with turning rotors or drums then fully bleed the fluid, If it is dark I continue bleeding till it runs clear with no bubbles. I also have and use a Power bleeder.
Brake fluid will over heat and Boil with hard braking continued hard braking like riding them down hills is the worst It will boil once it boils its cooked and starts breaking down just like engine oil.
its important to purge this old oil from the system as that's the oil that will cause harm to your Calipers or wheel cylinders depending on the car and truck.
Being a Corvette makes no difference in Brake maintenance. Brakes are brakes Burnt Black brake fluid is bad flush it out.
I am not gonna get into trying to explain why Boiled fluid will cause harm to Calipers or wheel cylinders as I have my own opinions which is not the same as others and I am not posting my opinions to change anyone's minds just saying my experience of damaged Calipers or wheel cinders always includes Burnt black Brake fluid.
Brake Master cylinders and clutch master cylinders almost always show broke down degraded rubber from age.
Last edited by Dudly Doright; Dec 31, 2022 at 11:28 AM.
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