Hi, I'm restoring a kitcar that uses all sierra xr4x4 parts. The rear calipers were leaking a bit so replaced them with new ones, now I can't get them bleed.
I have followed the correct procedure, key to position 1, open nipple etc, but not getting a good flow of fluid. Abs pump cuts in for about 5 secs when pedal is pressed but cuts out again so take it is fine as making pressure
have tried a pressure bleeder on it but no joy,
any body any ideas of whatever problem could be.
the fronts bleed no problem.
thanks.

 

Here is a pic of the car