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BrakesDiscussions about the brake system in your vehicle and brake products.
This is a discussion thread titled "Help with brake please! Need advice!", within the Brakes forum, part of the Technical & Vehicle Assistance Forums category.
Hi guys.
I am in the process of doing the SOS rear disc brake conversion. I have all of the hardware installed and in place. I used a Motiv Power Bleeder to bleed the system using ATE Super Blue brake fluid.
I started at the pass side rear, then the drivers side rear, then the porpotioning valve, then the pass side front, and finally the drivers side front. I bled everything THREE times and went through two quarts of Super Blue and the brakes are still spongy! Did I miss a bleeder somwhere?
I don't know what to do. I suppose I could try bleeding everything again, but it seems like everything has been bled pretty well. Is this something I am goiong to need to have the dealer fix?
Thanks in advance for any help.
Did the master cylinder go dry? If so it may need bled. You can do this by cracking open the line ate the master and seeing if air comes out. Be on this you could have a mechanical problem or a miss match with the master cylinder bore size and the calipers. Remember the master cylinder is only designed to move a wheel cylinder wich has a much smaller bore then most calipers.
Check with the kit manufacture, they may recommend a different master cylinder.
Mike
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“The significant problems we have cannot be solved at the same level of thinking with which we created them” (Albert Einstein) Moderator Brake Forum
Thanks for the advice Mike. There are several other TS members that have installed this kit and have had no problems, so I tend to think it is air in the line somewhere. I just don't understand how there could be any air because I bled the heck out of the lines.
The master never went dry (empty). The "Power Bleeder" pumps fluid into the master at 15psi and the master is full during the entire procedure.
AAARRRGGHHH!!!
15 psi is very high can you take it down to about 5. If the bleeder does not have a bladder (air is in direct contact with the fluid) the fluid can take on tinny air bubble and build up in the system. You may try letting it sit over night and foot bleeding. Start by cracking open the master cylinder lines and then working back.
Also try tapping the calipers with a wrench to dislodge any trapped air.
One last thing, the bleeder screws are at the top, right?
Mike
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“The significant problems we have cannot be solved at the same level of thinking with which we created them” (Albert Einstein) Moderator Brake Forum
Thanks again Mike.
I did run the truck around town a little today, and they are a little better. I think you are right, there is some air in the system that I may be able to get rid of after driving around a bit and re-bleeding.
The bleeder screws are at the top of the cailpers, and I have tried tapping on the caliper/proportioning valve, etc while bleeding. It is still a little squishy, but I will re-bleed at the lower PSI and hopefully it will get better.
Thanks again,
Ken
Try bleeding the brakes again without the power bleeder. I'm not sure but I
think I saw on an episode of "Two Guys Garage" where some power bleeders
and anti lock brakes may not be compatible - something about fluid foaming
and subsequent air in the lines. If you haven't gotten it sorted out already,
it couldn't hurt to give it a try.
Try bleeding the brakes again without the power bleeder. I'm not sure but I
think I saw on an episode of "Two Guys Garage" where some power bleeders
and anti lock brakes may not be compatible - something about fluid foaming
and subsequent air in the lines. If you haven't gotten it sorted out already,
it couldn't hurt to give it a try.
dogger
Thanks Dogger. Yes, my brakes are still REALLY spongy. I am going to re-bleed the system, but am waiting for a replacement caliper (the e-brake spring broke off during installation).
Interesting about the power bleeder. I am tempted to put speed bleeders on, that might help solve a lot of problems.
I am a little concerned about the ABS module. There is no bleader on that unit and I am wondering if there is a way to bleed the module (it is almost as high as the master cylinder, so I can see how bubble would get trapped there.
I am really tempted to have my buddy at the dealership take care of it for me. He adjusted my brakes once and they felt better than they ever had.
Thanks again,
Ken
Help with brake please! Need advice!
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