When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
1) Bench Bleeding don'ts: Didn't I read somewhere here to only push the piston in until it's 'flush' with the housing (or some distance not fully depressed)? What's the limit how far I can go in. Mine didn't come with any instructions.
2) No bench bleeding procedure: Also, somewhat unrelated (for future reference, not this car), I thought I read where a guy could lock the pedal in the 1/2-way position and pressure bleed an entire system w/o bench bleeding the MC first? Does that sound right, or fiction? I'm not really planning on doing it, but just curious. What say you guys?
DIdn't bench bleed the new master cylinder when I installed it, had no problems getting brakes bled. Also, whats the big deal about bench bleeding it anyway? If the whole thing is about getting it "level", then just jack up the back of the car till its level and bleed it with the pedal.....no need to worry about pushing anything too much. There is no "magic trick" with the master cylinder mounted in a vice. If I am wrong,.....explain it.
Last edited by Shovels and Vettes; Jun 2, 2020 at 07:15 AM.
Well, lets see. Getting out your floor jacks, raising part of vehicle here & there. Place jackstands where needed . . . but wait! There is an easier way.
Why not just tilt the MC in your bench vise? H-m-m-m-m-m-. Too easy?
Click on my profile. Then photo albums > "bench bleeding". Screwdriver is inserted into back of MC no more than 1 3/8".
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
the manufacturers recommend bench bleeding to get the air out of the tiny pockets in the cylinder that wont release with normal bleeding by pushing the pedal and cracking the bleeder or gravity bleeding. The last 2 masters I bought came with a kit and instructions. If you use a pressure bleeder it MAY get those pesky air bubble out of the master cylinder. I ususally do a quick bench bleed with a screw driver on a bench. the vise is a good idea so your not pushing it all over the place on the bench. Be carefull as you manually move the piston as you can squirt the fluid right out of the cylinder and into your Eye or onto the paint if your doing it in a car. Then I pressure bleed the whole system.
This last time, I gravity bled and used a huge syringe to force the fluid though the system. I had a short test drive and the brakes felt great. I intend to revisit the brakes when I get the tranny back and see how they are feeling. As I wait though, I may pressure bleed them as Im getting bored and running out of the small things I need to finish up
Master Cylinder Bench Bleeding "Don'ts"?
