Problem bleeding brakes after 929 MC install
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Rotary Freak
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Problem bleeding brakes after 929 MC install
Well, i got my 929 MC installed after fabricating all the new lines and what not, bench bled on my workbench prior to install. Hook everything up, start bleeding brakes.
The rears put out some air, not much - some pedal resistance.
I get to the fronts, the pedal has no resistance while bleeding and the fluid is coming out really slowly.
I do all four wheels twice, then close the last valve and push the pedal - straight to the floor.
So I do it all again, same results. I disconnected the lines and bench bled the MC on the car, a few bubbles but not much. I notice at the end of the pedal stroke a air whooshing sound but no bubbles anywhere.
After hooking everything back up again, i still have no pedal pressure, but no bubbles in the lines when bleeding either.
What gives? Do i have a bad MC? I used Robinette's guide for the install
http://robrobinette.com/mastercylinder929.htm
TIA
The rears put out some air, not much - some pedal resistance.
I get to the fronts, the pedal has no resistance while bleeding and the fluid is coming out really slowly.
I do all four wheels twice, then close the last valve and push the pedal - straight to the floor.
So I do it all again, same results. I disconnected the lines and bench bled the MC on the car, a few bubbles but not much. I notice at the end of the pedal stroke a air whooshing sound but no bubbles anywhere.
After hooking everything back up again, i still have no pedal pressure, but no bubbles in the lines when bleeding either.
What gives? Do i have a bad MC? I used Robinette's guide for the install
http://robrobinette.com/mastercylinder929.htm
TIA
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LOL, i actually have one, but it's on loan to a miata track buddy :o
Mr3plus one gave me a tip on AIM, said I need to adjust the rod to the brake pedal to get it more travel. I'll try that and report back.
Mr3plus one gave me a tip on AIM, said I need to adjust the rod to the brake pedal to get it more travel. I'll try that and report back.
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The trick is to start bleeding from the MC out through every connector towards the ABS first. This will get all the air out before it gets to the ABS and the problem will not occur. Then afterwards you can bleed normally from the brakes.
I did the 929 MC this way and never had any problems.
It is the only logical way to get the air before it goes into the system.
I did the 929 MC this way and never had any problems.
It is the only logical way to get the air before it goes into the system.
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That's how i started out bleeding actually. I've adjusted the brake rod, re bled and i get no air out of the rears or the front left, but air is still coming out of the front right. I guess I just have a **** ton of air in the ABS?
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Well, it was a bad unit. I put my original new 929 MC on which I though had a bad rear port originally (my dumbass ignorance) and it works like a champ now.
Thanks for the replies.
Thanks for the replies.
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Originally Posted by hsitko
Cool, good job man. How was making the custom line? What do you think of the mod? Is it worth it? Let us know.
--Hank
--Hank
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Originally Posted by alexdimen
What's the point anyways? Do you guys have upgraded calipers?
All a larger bore MC does is allow you to move more fluid, but with a harder to press pedal, right?
All a larger bore MC does is allow you to move more fluid, but with a harder to press pedal, right?
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