Lost my way and need help on my 1969 Braking Issue

[John H.]

Re: Lost my way and need help on my 1969 Braking Issue

Gary -

What kind of device ("pnematic bleeder") are you using? Is it a vacuum or pressure device? I use a Motive Products pressure bleeder, and it has never failed to produce a solid pedal in less than ten minutes (with no assistant) on any Corvette disc brake system.


BleederTank.JPG

[James G.]

Re: Lost my way and need help on my 1969 Braking Issue

Yes, lots of air still in at least 1/2 of the system. DON'T FORGET TO KEEP THE MASTER FULL AFTER EVERY BLEED.

[James G.]

Re: Lost my way and need help on my 1969 Braking Issue

Your the man John. Great modern device. Can you describe by part number please?

[Gary J.]

Re: Lost my way and need help on my 1969 Braking Issue

John
i am using a vacuum pneumatic bleeder, that bleeder looks like a great device. Are you saying with that type of bleeder you don't even have to go wheel to wheel but it does it all from on top of the master cylinder or is that picture showing just the master cylinder being bleed? Sorry if that is an obvious question but I am not sure? Also, where is it sold. Thank you. John, please price a plane ticket from your home to either Boston or Providence. I'll pick you and the bleeder up at the airport. LOL thank you to all for your assistance, it's a new day and I hope to get started again in a few hours.

[Paul O.]

Re: Lost my way and need help on my 1969 Braking Issue

Gary

You would still have to go to each bleeder at the calipers. This type pressure pushes the fluid there not pulling or suction of the fluid at the bleeder. Gary I would be still concerned that you may have a master cylinder problem. My friend had 3 master cylinders the 3rd was finally was a good one.

Paul 18046

[Paul J.]

Re: Lost my way and need help on my 1969 Braking Issue

Gary I would be still concerned that you may have a master cylinder problem. My friend had 3 master cylinders the 3rd was finally was a good one.

Paul 18046

Gary, everything points to a faulty master cylinder. While you would'nt expect a new M/C to be defective, it can happen.

Paul

[Joe L.]

Re: Lost my way and need help on my 1969 Braking Issue

Your the man John. Great modern device. Can you describe by part number please?

Jim------


For 67-82 here it is. For others the same unit is used with a different master cylinder adapter.

http://motiveproducts.3dcartstores.com/Early-American-Rectangular-Cap--Metal-Version_p_48.html

[Joe L.]

Re: Lost my way and need help on my 1969 Braking Issue

All:
I have just added a rew car to the garage "goldie locks" , a 1969 427/390 coupe Riverside gold with a saddle interior. When I bought the car two weeks ago the brakes were barely able to stop the car. NON Power brakes, the pads look fine and the previous owner changed the fluid to Dot 3&4 Synthetic. I started at the right rear and tried to bleed the brakes the old fashion way with my bride in the driver seat doing pedal duty. When trying to bleed the brakes I could only get a small amnount of volume of fluid out of both the inboard and outboard bleeders (full depress pedal).
So I moved on to the master cylinder to see if it was air bound or needed bleeding, the bleeders were sripped and frozen so I bought the bullet, small price of $110 and bought a delco DC mastercylinder. Bench bleed prior to install, then installed. Went out and bought a Pnematic bleeder to do the job alone. (highly rated) Back to the right rear wheel, even with the power bleeder only air and some bubbles coming out almost no fuild. I did both sides of the caliper bleeders. The pedal goes to the floor with almost no resistance.

Where do I go now? proprtioning valve, I have done this previously with the power bleeder on my 67 no issues, stumped?

Thanks
Gary

Gary-------

I notice you mention that you purchased a "Delco DC master cylinder". Do you mean a NEW reproduction master cylinder, a NEW Delco replacement master cylinder, or a rebuilt original master cylinder? If the latter, was it sleeved?

[Gary J.]

Re: Lost my way and need help on my 1969 Braking Issue

ALL
"we have brakes" thank you to all who assisted with their advise. Fellow member and great professional mechanic, Ed Johnson called this morning offered to help me, In under 2 hours full pedal. He check to make sure I had bleed the master cylinder correctly, I did something correct, LOL, and proceeded to gravity bleed each caliper using nothing, just opened the bleeder and p
atiently waited for the air to escape and then the fluid to weep. He started in the left front, moved to the right front and then two the rears and did each bleeder at those calipers. Had a decent pedal after the first trip around the car, after the second trip using the same gravity system, firm excellent pedal.
So there I am spending $35 on a pneumatic bleeder system, pulling the fluid with my compressor for two days and two quarts of fluid and Ed uses his skills and a open end wrench and in under two hours completes the task.

Again thanks to all, I am sure that you will hear more about my mechanical repairs on "Goldie Locks" soon.

We are a great bunch of people on this forum.

Gary

[Joe L.]

Re: Lost my way and need help on my 1969 Braking Issue

ALL
"we have brakes" thank you to all who assisted with their advise. Fellow member and great professional mechanic, Ed Johnson called this morning offered to help me, In under 2 hours full pedal. He check to make sure I had bleed the master cylinder correctly, I did something correct, LOL, and proceeded to gravity bleed each caliper using nothing, just opened the bleeder and p
atiently waited for the air to escape and then the fluid to weep. He started in the left front, moved to the right front and then two the rears and did each bleeder at those calipers. Had a decent pedal after the first trip around the car, after the second trip using the same gravity system, firm excellent pedal.
So there I am spending $35 on a pneumatic bleeder system, pulling the fluid with my compressor for two days and two quarts of fluid and Ed uses his skills and a open end wrench and in under two hours completes the task.

Again thanks to all, I am sure that you will hear more about my mechanical repairs on "Goldie Locks" soon.

We are a great bunch of people on this forum.

Gary

Gary------


Gravity bleeding works quite well but the downside is that it can take a lot of time from start to finish. Plus, it's sometimes hard to get the fluid started to move through the system.

I've never had a lot of luck with vacuum bleeding systems.

The Motive Products pressure bleeder can accomplish the whole bleeding project in about 10-15 minutes.

[Terry M.]

Re: Lost my way and need help on my 1969 Braking Issue

I tried suction bleeding once and all I succeeded in doing was pulling the caliper pistons into the calipers. I gave up on that and resorted to gravety bleeding and all was well. However that was on the isntallation of DOT 5 a quarter centurary ago.