created this page to share my somewhat disappointing experience with the KIA D4FE engine and the fun I had repairing one which hopefully will help others.
The D4FE is a full aluminium Euro VI compliant replacement for the earlier D4FB engine which had been considered a very reliable power unit.
Unfortunately it appears that the group way have cut a few corners when developing this completely new engine and exasperated those issues when they decided to mate it to a Mild Hybrid (MHEV) system.
Hello sir, my story ,I rebuild the D4fE engine cuz xonrod was snapped in cylinder 4, put new piston, piston rings ,all seals ,new oil pump,all conrods, car works fine ,engine is good drives good too, the issue i have is since I rebuild the brakes doesn’t work good, I mean the pedal gets hard, so I changed servo ,master cylinder, put on mot brake test found that rear brakes are not discharging , so I put new rear disc ,new brake pads, but still the same story, front driver side break good ,passenger side 80 % good and rear brake not good ,I mean not working, the electric parking brake wirk fine, changed brake oil,,done brake bleed still not resolved,
My question is that does this engine have a brake vacuum pump on the gearbox side just under the camshaft ? I see the vacuum metal pipe comes from there and than connects to the brake hose for cylinder.
Will this be the problem
The oil pump (tandem pump) also generates the vacuum for the brakes so check that there is a vacuum pulling on the brake servo, if not there might be debris in the tandem pump or the seals were not re-installed correctly (there are seals between the pump and the upper oil pan/girdle and then seals between the upper oil pan/girdle and the block).