Wheel Cylinder troubles.

[Edster]

Recently I replaced my old wheel cylinder w/ new units purchased at and Advance Auto Parts store. I've spent hours trying to bleed the brakes. I still get a large amount of air out of them. I checked all under the car and found no damage to the lines. Before I changed the wheel cylinders I had a fairly solid pedal (manual brakes front disc). I'm wondering if the wheel cylinders had poor machining in the line seat or bleeder seat. They were not made in the US. I think it was Mexico or China. I can't think of what else it could be as that was the only thing that was changed in the hydraulic side. I thought it was because I didn't adjust the new shoes but still no progress even after adjusting the shoes.

Any insight?

 

[TOM B]

I had the same problem with the advance wheel cylinders, here is what I found.
The bleeder screws are to loose in the threads so when you "crack" them open to bleed they draw air through the threads, more so with a one man pump bleeder.
I went back and purchaced 4 self bleeded screws and they fit tighter and worked great.
JUST MORE CHINA CRAP!

 

[Edster]

Just as I thought!

I thought the screws were a little loose. I went ahead and ordered some new wheel cylinders from CJ Pony instead. I didn't want the hassle of getting bleeder screws then the problem being something else. Thanks for the info it really helped. Now I know I'm not chasing a ghost.

 

[wild70stang]

Yep, only go to krapen, autocrap, and advanced crap for filters and chemicals (and maybe some other small parts). Made the mistake of buying wheel cylinders from kragen (I was desperate and had to get the job done quick), NEVER AGAIN. The quality is obviously not the same. Of all the mustang vendors I like CJ the best. Fast delivery, pretty competitive prices, and free shipping wednesdays (orders over $50) . just my 2 cents

 

[65ShelbyClone]

Ideally you either use a brake bleeder that attaches to the master cylinder or use the two man method. With the two man method, you have one person on the pedal and one on the bleeder. The one manning the bleeder must close the bleeder before the person inside can let the pedal come back up. That prevents air from being sucked in through the bleeder fitting.

 

[Edster]

Yep I did all that w/ the two man job. I swapped out the wheel cylinders with the units from CJ pony. One had a bleeder screw that was a 10mm nut size. Anyway I still haven't got all the air out. I might have to use a pressure bleeder. I've alread run a quart of fluid through the rears to no avail. I had someone pump up the brkes until the pedal was solid and had them push hard so I could look under the car to find leakage. No leaks, no puddles. I'm just like a muffler, baffled!