Rx400h front brake imbalance

[CJJH]

Hello all. Had the car in for MOT inspection and it failed on front brakes not balanced, over 20% difference.

I changed the front calipers ,hoses and master cylinder. I took it back and it passed but there is still some imbalance, to much for my liking.

The rears are more or less identical on balance.

I used a vacuum blender with the peddle slightly pressed and removed ABS fuses as Tech stream advised.

Any ideas? Could there still be air in the system? Peddle feels firm so I think master cylinder is bled ok.

I also bled rear brakes.

Edited April 25 by CJJH
Forgot to add some info

[CJJH]

Vacuum bleeder not blender!!

[welland]

On 4/25/2024 at 7:57 AM, CJJH said:

Hello all. Had the car in for MOT inspection and it failed on front brakes not balanced, over 20% difference.

I changed the front calipers ,hoses and master cylinder. I took it back and it passed but there is still some imbalance, to much for my liking.

The rears are more or less identical on balance.

I used a vacuum blender with the peddle slightly pressed and removed ABS fuses as Tech stream advised.

Any ideas? Could there still be air in the system? Peddle feels firm so I think master cylinder is bled ok.

I also bled rear brakes.

Wow, that's a lot of work, especially the master cylinder.  You didn't mention what I would consider easy things:  pads and discs.  What are they like?

What are the caliper slide pins like: sliding freely?

[CJJH]

Changed all pads and discs about six months ago so all new.

The caliper slide pins are fine and move freely.

I'm stumped.

[welland]

You haven't got a kink in one of the hoses, have you?

[CJJH]

No. Made sure the Flexi hoses were good when fitting. 

[CJJH]

I think I can access the four wheel cylinder pressures using techstream data list. Might check that out.

[welland]

Before you changed the hoses, calipers and master cylinder, did you identify a problem with them? Or did you change them in the hope it would fix the imbalance?

[CJJH]

The car has 260 kilometres so I thought it was time to change them anyway.

[CJJH]

260,000 kms