Heres where I'm at.
Getting ready to bench bleed the M/C. I have everything ready such as the calipers, hoses and brake lines. I installed new front lines & pre fitted to screw into the M/C.
Frist time to B/B a M/C
Questions:
Do all four, front and back calipers recieve the little copper washer between the caliper and hose connection. My kit only came with two but I have more for the rear.
This M/C has the bleeders on the m/c. When B/B the m/c should I bleed from the hose line ports or can I bleed from the bleeders. I have the attachment nipples with hoses mounted into the hose line ports to run into the reservior when bleeding the m/c
Can I install speed bleeders onto the m/c to help with bleeding out the air of the m/c once it's mounted in the car once the system is blead and running. You know down the road if I need to bleed the brakes for any reason.
This is what I dont have pictured in my head as far as doing this job.
Once the air is out of the m/c from B/B then I carry it to the car to install onto the brake booster is there a lot of fluid going to pour out of the line ports and will or can air migrate back into the m/c? I'm not worried about the reservior I'm worried about the fluid pouring out of the ports before I can get the lines hooked back up and letting air into the m/c.
Do I need a gasket for between the m/c and the brake booster?
My main concern is to get this m/c bleed and on the car without spilling a butt load of brake fluid all over everything.
I appreciate any help and or input. I'm taking pics as I go on this and will try to send a few here once I get everything finished.
Thanks,

 

Yes, washer at each caliper.


Hose ports connect to lines and pump fluid back directly to the reservoir. Bleeders are only used at the calipers. Bench bleed numerous times with the MC level. nose slightly down and nose slightly up until you can continue to bench bleed and have absolutely no evidence of air. Add fluid to the reservoir to take up most of the air space(3/4 inch below lip) and lock down the reservoir lid before disconnecting the port lines and air can not be introduced back into the master. Port connections can be switched over after the MC is back in place on the booster.

Note : You cannot over bench bleed! Ensure there is no evidence of air when bleeding. Then make sure that while bleeding on the car that the reservoir never gets low enough to re-introduce air; or you will be bench bleeding again.

This picture shows the set-up for bench bleeding, however; by the time the MC is back in the car, the lid should be firmly locked down until the original brake lines are re-attached at the MC.

 

Hi Dannyman,
Thank you very much for the quick response for my questions.
Good to know about the level of the m/c slightly up & down while bleeding the cylinder.
I never would of thought to put the lid on the m/c to keep the fluid from leaking out of the ports. Duh, That makes sense.
Ok so this m/c I have with the bleeders threaded above the line ports on the side of the m/c are not to be used at all for bleeding the air out of the cylinder? Trying to figure out what there for, or why they'er there?
Thanks again.

 

The bleeders that you are talking about are for bleeding the master cylinder. Chevrolet had them on there until about 1972. If you look at the picture above, the process is the same, just place rubber/plastic lines over the bleeders and back into the M/C well.


http://www.zip-corvette.com/ProductD...GR-SR&CTitle=&


By the way, did anyone see HorsepowerTV last week?...........the guy bench bled the M/C but plugged the outlet ports and pumped the M/C until no air bubbles showed. I thought this was waaaay off but has anyone ever done it this way........using plugs on the outlet ports and just pumping until all the air came out?

 

I tried it for fun,I don't think it works well for a Corvette. It might work OK on other cars but as most know on a Vette you have to get every last tiny bubble out of the rear cylinder if you want a solid pedal.

 

Hey Guy's,
Thanks for the infomation. Ended up having a sh!tty day dealing with these brakes. I'm still in a pissy mood. Must be the heat no dought.
I'll jump back into it tomorrow with a clear cooled off head.
I may have to use the power bleeder.
Speaking of bleeders. Speed bleeders suck.
There now I'm feeling better already.
Thanks again.

 

Bench bleed work for you?

Gravity feed to bleed the system; works best.

 

Hi dannyman,
Yes sir it worked perfect. I did like you said and worked all the air out of the m/c. My big vise is not bolted down to the counter top so I was able to tilt the m/c up, level, then down and each position I bleed out air. I did this at least three times each position and was confident no air was in the m/c. I have a sander and held the rubber pad of the sander for a few seconds at the bottom of the m/c to maybe help move any air bubbles. Did it work? I dont know but did see a few bubbles come out.
I had put speed bleeders on the front calipers when I installed them the other day. Keep this in mind.
Also to let you know the front brakes is what I've been working on and rebuilding I havent replaced the rear brakes YET. I'll try to sit down tonight and throw in some step by step pics of my set up.
Once the m/c was bleed I installed it on the booster then with the lid on tight I removed the bleeder lines from the ports and hooked up the brake lines.
Now this is where I think I messed up. Like I said I had put speed bleeders on the front calipers, hooked up my bleeder hose and bottle and started pumping the brake pedal. Nothing. This went on for some time & still nothing. Motor not running. The first time I saw nothing was moving and let the pedal come back up I think I sucked in air to the m/c. I kept trying but no flow out of the speed bleeders. Couldnt even tell if they were open either. Thats the reason for getting the speed bleeders is I work alone most of the time on my car and hoped it would help me bleed the brakes doing it this way.
I then changed out the speed bleeders, hooked up the gravity hose and let it set. Just bleeding the D/S caliper at this point. Again nothing.
Now in the past I've bleed gravity bleed the brake system on this car and my vert with great results but now I'm not getting any flow.
I pull out the mighty vac hand pump and managed to get the front bleed down but still dont like it yet.
Today I'll bleed the rear and see how the brakes feel. I may go as far as pulling the m/c back off and starting all over again bleeding the system down again. So we'll see.
Thanks.

 

If you have doubts; bench bleed again and re-install; loose the speed bleeders until the system has been completely gravity bled. Remember to keep the reservoirs topped up so no more air enters the system.

 

Thanks for all the help again. Went ahead and purged the rear calipers just to make sure everything was bleeding ok, then pulled the m/c back off and bleed it to be on the safe side and yes there was a few bubbles come out of the cylinder then re-installed the m/c and bleed the entire car front and back one more time. Keep in mind I still havent ran the engine yet and pumped the pedal and have hard brakes.
Hopefully by the end of this week I'll have the car off the jacks to start the motor and test drive around the block. Then it's back up on the jacks to finish the complete rear section on the car.
I took off those NOT so speed bleeders and put the original bleeders back on the calipers.
Managed to get a lot of other things done to the car today and it wasnt near as hot so it was a good day.
Thanks.