My brakes are still spongy and not working after replacing nearly every part possible.

[joshur21]

I have replaced my brake master cylinder, brake booster and check valve, and rebuild my front brake calipers. I also replaced the hard line running to the rear drum brakes due to rust. I went and bled the system multiple times and it appears to have no air in it. However with the truck running it has little to no resistance and with the truck turn off there is pressure, but the pedal this goes to the floor fairly easily. There is no visible fluid leaks anywhere as well and I bench bled the master cylinder before installing it. The truck is a 1988 Ford ranger with the 2.9l Engine and No ABS. Any Help would be much appreciated. Thanks!

 

[Josh B]

Have you recently changed Calipers or wheel cylinders? The last "new" calipers I got leaked down inside

 

[Ranger850]

I would check the rears for leaking wheel cylinders,

 

[Dirtman]

Did you get NEW parts or REMANUFACTURED parts? I'd trust a reman master cylinder about as far as I could throw it.

 

[adsm08]

Did you get NEW parts or REMANUFACTURED parts? I'd trust a reman master cylinder about as far as I could throw it.

New ones aren't always great either.

Last new master I bought had an incomplete casting in one of the line ports. It was supposed to accept a double flared line, the center hump was not present, and the hole didn't penetrate to the fluid chamber.

 

[Locotomb]

Maybe your rear drum adjusters are slipping.