Wheel cylinder leaking

[Oldyukon95]

I'm not sure what I'm doing wrong. I went offloading and blew out my wheel cylinder. I've replaced it 3 Times as well as the brake pads and springs etc. I've worked on both sides. But the rear drivers side Wheel cylinder still leaks. Each time I've replaced it the brakes have been a little better. Now the brake like doesn't come on. But it's still leaking. Any ideas would be appreciated.

 

[iLikeEggs]

Leaking from the seals or the brake line? Was it rebuilt with the kit or entirely replaced?

 

[Oldyukon95]

its leaking from the wheel cylinder not the brake line. And only when I drive. I didn't rebuild them. But I bought them at oreillys

 

[iLikeEggs]

They can usually be rebuilt easily and reliably. I doubt it it anything you did, especially since it sounds like you've done this before. It could just be bad product. Usually they come off the shelf from parts houses as remnaufactured, unless it specifically states new on the box. It's possible that you have encountered a bad run. Someone on the assembly line could have honed out a bunch of them a little too much, creating too much clearance for the stock pistons and seals.
Try a different parts house, NAPA, Autozone, etc. See if the results are different. They shouldn't be blowing out.

 

[SunlitComet]

details on dr number and drive type and what part numbers you are using please?

 

[Oldyukon95]

Alright ty

its leaking from the wheel cylinder not the brake line. And only when I drive. I didn't rebuild them. But I bought them at oreillys

I'm not sure the exact part number I'll check when I'm home but they are 10 inch wheel cylinders on a 4wd yukon. I checked again last night and the leak may be very small. I also have spongy brakes or there is no pressure until it nearly bottom out. The truck stops but I'm definitely not comfortable on how far I have to push the pedal down before they work. But the Brake light is no longer turning on. It was before because the first two cylinders were leaking and the pedal would bottom out all the way and the brake light would come on.

 

[SunlitComet]

is is 2dr or 4dr?

 

[iLikeEggs]

Are the drums new or still within specs?

 

[Oldyukon95]

is is 2dr or 4dr?

2 door

 

[Oldyukon95]

I did not replace the drums and I didn't measure them but they look fine. What is the spec for thickness. They are smooth with no groves worn into them